Zipp 808 Firecrest Carbon Tubeless Rear WheelZipp's 808 Firecrest Tubeless rim-brake rear wheel makes you faster with an 82mm rim depth that's fast, stable in crosswinds, and now tubeless-ready. That means you get all the aero benefits with having the ability to run lower tyre pressure for increased cornering grip and compliance and reduced rolling resistance, without the risk of pinch flats. This rear wheel is infused with technologies developed in Zipp's Indianapolis advanced development lab. Zipp's ABLC Sawtooth Technology uses a complex dimpling pattern to improve aero efficiency. Zipp's ShowStopper textured braking surface delivers unrivalled rim braking performance in wet or dry conditions. At the centre of the 808 Firecrest Tubeless rim-brake is a versatile and durable hub, the German-engineered ZR1. Zipp's wheel cosmetics make this rear wheel a perfect pairing of speed and style.ShowstopperZipp's industry-leading Showstopper brake track continues to evolve and improve, providing unmatched stopping power and modulation regardless of weather conditions or the length of the descent. Showstopper is a complimenting pairing of a directional, moulded-in, texture with silicon carbide particles suspended in the surface resin. The current media blast process applied to all Zipp rims increases the surface roughness of the brake track providing the rider with consistent and responsive braking.ABLC SawtoothThe Sawtooth dimple design consists of 12 nodes that are specifically clocked to start aerodynamic shearing at a rate of 50hz at a rider speed of 20mph. Sawtooth accomplishes this by inducing small sheet vortices that shed at a low magnitude, but at a higher natural frequency, thus decreasing the laminar bubble effect on the aerodynamically shielded side of the rim's profile to further reduce high yaw drag and improve crosswind stability.AerobalanceZipp's sole mission is to help you go faster. That's why the brand's wheels are race-ready before they're camera-ready. For years, Zipp has used a combination of testing methods - wind tunnel, CFD computer simulations, pro athlete evaluations, on-road testing, and the RollingRoad ride simulator - to refine aero performance to new levels of excellence. Over the decades of innovation, its engineers have learned to look beyond just focusing on simply reducing aero drag. Instead, the goal now is to reduce aero drag while also minimising the effects of crosswinds on handling. This optimising of aero efficiency and crosswind stability became known internally at Zipp as AeroBalance. The approach began with Firecrest technology and has been advanced with the introduction of the NSW lineup, especially with the Sawtooth technology found in the 454 and 858 NSW. Sawtooth accomplishes this with a series of patented fin-shaped Hyperfoil nodes along the inner diameter of the rim that works together with Zipp's new HexFin ABLC dimples for improved airflow.Features: Rim Material: Carbon with UD Fibre finish and adhesive decals Use: Road Axle Type: QR 130mm (quick release) Internal Rim Width: 18mm Rim Depth: 82mm Rim Profile: Symmetrical Brake Compatibility: Rim Brake Size: 700c Tyre Compatibility: Clincher, Tubeless Ready Surface Texture: ABLC SawTooth Nipple Material: Aluminium Nipple Anti-rotation: Sapim Secure-loc Spoke Type: CX-Ray - Black Spoke Count: 24 Spoke Pattern: 2 Cross Hub: ZR1 Rim Brake Axle Material: Aluminium Bearings: Cartridge - Stainless Steel Driver Mechanism: 6 Pawls Leaf Spring Driver Body Material: Aluminium Max Tyre Pressure: 125psi Max Recommended Rider Weight: 250lbs Single or Pair: Single rear wheel Weight: 1003g (approx)Technologies: New Zipp graphics and cosmetic identity that scream speed. New ZR1 hub is engineered in Germany with a better seal design for improved durability and quicker response with 66 points of engagement. Built with Sapim CX Sprint J-bend spokes. Tubeless ensuring secure performance even when ridden at lower tyre pressures. ABLC Sawtooth dimple design helps manage air flow around the rim, and contributes to creating a faster, more stable wheel. Showstopper textured brake track delivers superior modulation and shortest stopping distances in wet and dry conditions. Ships with QR end caps, quick release skewers. Campagnolo driver body sold separately.Manufacturer's Part Number: ZPWH8586000 Black 700c Shimano/SRAM ZPWH8586001 Black 700c SRAM XD SRAM XDRBuy Zipp Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.
RX870 gravel tuned 12/11-speed 700c tubeless rear wheel offering all the technology of Shimano wheels balancing the best combination of rim weight and strength to deliver an exceptional gravel wheelset 32 mm high profile full carbon rim for improved aero dynamics and durability 25 mm internal rim width to accommodate a wider section tyre from 32-50mm Easy to use Center Lock rotor mount for use with disc brakes 24 stainless steel butted and bladed straight pull spokes with a 2-cross lacing pattern improve lateral and torsional (power transmission) rigidity Elbow-less spokes with alloy nipples make for a strong yet compliant wheel The hub uses angular contact bearings designed to cradle the balls giving both radial and lateral support for superior strength and durability in real world riding conditions. They also offer precision bearing adjustment and easy maintenance Free hub utilising a pawl ratchet engagement for precise pick up Labyrinth and contact sealing - low-friction seals effectively shut out water, mud and dirt without affecting rotational smoothness E-thru axle rear 142mm Weight rear 822gms Colour Black Wheel Diameter 700c
The Shimano RS710 C32 disc-brake wheelset, along with the deeper-section C46, is the Japanese brand’s most affordable carbon, road wheelset ever. Drawing on their experience in producing the more premium Dura-Ace and Ultegra lines, Shimano have crafted a wheelset that balances aerodynamic advantage, with weight and overall rigidity. A Wheelset for Mountains Weighing a respectable 1,511g for the set, the Shimano RS710 C32 is perfect for those big days spent cycling in the mountains. Although there might be lighter wheels on the market—though perhaps not this price point—you certainly won’t feel weighed down by these hoops. With a lighter wheel you’ll feel the zip when you put down the power, getting you up to speed in no time. Whether you need a quick burst of acceleration to crest a sharp hill or to see off a potentially race-losing attack, the RS710 C32s won’t leave you watching the peloton motor on without you. Wider Rims, Better Braking Boasting a wider rim profile than any other Shimano wheel at this level, you’ll be able to fit a wider and tubeless tyre; the benefit of this being you can run the tyre at a lower pressure. It’s widely accepted now that, contrary to past beliefs, running a wider tyre at lower pressure reduces rolling resistance, which in turn increases speed for a given power. Furthermore, a wider tyre will work more effectively with a wider rim in terms of aerodynamic performance, again offering you more speed for less effort. The Shimano RS710 C32 is engineered for hydraulic disc-brakes, meaning you’ll benefit from the stopping power offered by this braking system. The advantages of discs over rim brakes have now been widely accepted: you’ll have consistent performance in the wet, you won’t have to fear overheating your rims on long and/or steep descents, and you won’t be concerned about your expensive rims eroding away every time you break. Lastly, for the mechanically minded, Shimano have stuck with their tried-and-tested cup-and-cone bearings in the hubs. This is similar to the used on many of the brand’s hubs, which are highly regarded for their reliability and simplicity. So if it’s a carbon wheelset that’s relatively light, reliable, and offers top performance look no further than the Shimano RS710 C32. Product Features 32mm rim depth Compatible with 11- and 12-speed Weight: 1,511g for the pair Internal-rim width of 21mm External-rim width of 28mm Spoke count: 24 front and rear Hub design: cup and cone
Zipp s 404 Firecrest Carbon Tubeless Disc Brake is the icon of speed with three decades of use. The 404 s heritage as Zipp s icon of speed extends back decades and its future is even brighter. At 58mm deep, the 404 Firecrest Tubeless is ideal for road races, time trial and triathlon and gran fondos. The wheelset s 23mm internal width is perfect for running wider tubeless tyres at reduced air pressure.Technology: Total System Efficiency, ABLC DimplesVersatile race wheels for the modern road race bike with tubeless and hookless rim profileOptimized tyre bed for easy tyre installationWide 23mm rim profile creates a better tyre interface to be fast on or off the roadNew ZR1 DB hub is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagementShips with 12mm front and rear end capsCentre locking rotor interface. Lockring is included with the wheelsXDR or SRAM/Shimano driver bodies (Campagnolo driver body sold separately)The 404 Firecrest Tubeless Disc brake is about 370 grams lighter than its predecessor - 1450g wheelset* - Front 660g Rear 790gLifetime Warranty*Lightest configuration: 12mm through axles and XDR body. No tape or valve included in weightThat is a vital component of Total System Efficiency, or TSE, an approach to speed on ever-changing roads and riding conditions. Specifically, TSE focuses on overcoming specific barriers to speed: wind resistance, gravity, rolling resistance, and vibration losses. Zipp s ABLC Sawtooth Technology uses an intricate dimpling pattern to improve aero efficiency. Zipp s use of hookless (straight side) rims in the 404 Firecrest is integral to making you faster. With hookless, the transition between the tyre and the rim is more seamless and aero. Zipp s hookless rims have more efficient resin distribution, which means lighter, stronger wheels. Outdoor testing commissioned by Zipp revealed the real-world gains of Zipp TSE. A bike and rider system weighing 85kg (187lbs) on the new 404 Firecrest with 25mm tyres required 286 watts to maintain a speed of 40kph. That s a 4-watt savings compared with the previous model 404 Firecrest. At the centre of the 404 Firecrest Tubeless Disc-brake is a versatile and durable hub set, the German engineered ZR1 DB. If you had to choose just one wheel for road riding and racing, the 404 Firecrest Tubeless Disc brake is a savvy and speedy choice.
Zipp s 404 Firecrest Carbon Tubeless Disc Brake is the icon of speed with three decades of use. The 404 s heritage as Zipp s icon of speed extends back decades and its future is even brighter. At 58mm deep, the 404 Firecrest Tubeless is ideal for road races, time trial and triathlon and gran fondos. The wheelset s 23mm internal width is perfect for running wider tubeless tyres at reduced air pressure.Technology: Total System Efficiency, ABLC DimplesVersatile race wheels for the modern road race bike with tubeless and hookless rim profileOptimized tyre bed for easy tyre installationWide 23mm rim profile creates a better tyre interface to be fast on or off the roadNew ZR1 DB hub is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagementShips with 12mm front and rear end capsCentre locking rotor interface. Lockring is included with the wheelsXDR or SRAM/Shimano driver bodies (Campagnolo driver body sold separately)The 404 Firecrest Tubeless Disc brake is about 370 grams lighter than its predecessor - 1450g wheelset* - Front 660g Rear 790gLifetime Warranty*Lightest configuration: 12mm through axles and XDR body. No tape or valve included in weightThat is a vital component of Total System Efficiency, or TSE, an approach to speed on ever-changing roads and riding conditions. Specifically, TSE focuses on overcoming specific barriers to speed: wind resistance, gravity, rolling resistance, and vibration losses. Zipp s ABLC Sawtooth Technology uses an intricate dimpling pattern to improve aero efficiency. Zipp s use of hookless (straight side) rims in the 404 Firecrest is integral to making you faster. With hookless, the transition between the tyre and the rim is more seamless and aero. Zipp s hookless rims have more efficient resin distribution, which means lighter, stronger wheels. Outdoor testing commissioned by Zipp revealed the real-world gains of Zipp TSE. A bike and rider system weighing 85kg (187lbs) on the new 404 Firecrest with 25mm tyres required 286 watts to maintain a speed of 40kph. That s a 4-watt savings compared with the previous model 404 Firecrest. At the centre of the 404 Firecrest Tubeless Disc-brake is a versatile and durable hub set, the German engineered ZR1 DB. If you had to choose just one wheel for road riding and racing, the 404 Firecrest Tubeless Disc brake is a savvy and speedy choice.
High performance carbon laminate road racing wheel meets the demands of today's professional and amateur ridersSmooth surface carbon and alloy tubeless ready clincher rim is both light weight and rigid whilst maintaining high braking performance with standard brake pads,30 mm rim height,Stainless steel butted and bladed straight pull spokes for optimal balance and rigidity (OPTBAL),High lateral rigidity is improved with a wide flange spacing,Labyrinth double contact sealing - low-friction seals effectively shut out water, mud and dirt without affecting rotational smoothness,Quick and easy to maintain digital click bearing adjustment,Polished bearing races reduce friction and provide for smooth rotation,Cold forged and machined aluminium hub shell and oversized 7075 alloy axle keep the wheel weight to a minimum,8, 9, 10 and 11-speed compatible,700C tubeless clincher compatible,Supplied with Q/R skewer.
Zipp’s 404 Firecrest Tubeless Disc-brake is the icon of speed with three decades of use. The 404’s heritage as Zipp’s icon of speed extends back decades, and its future is even brighter. At 58mm deep, the 404 Firecrest Tubeless is ideal for road races, time trial and triathlon, and gran fondos. The wheelset’s 23mm internal width is perfect for running wider tubeless tires at reduced air pressure. That is a vital component of Total System Efficiency, or TSE, an approach to speed on ever-changing roads and riding conditions. Specifically, TSE focuses on overcoming specific barriers to speed: wind resistance, gravity, rolling resistance, and vibration losses. Zipp’s ABLC Sawtooth Technology uses an intricate dimpling pattern to improve aero efficiency. Zipp’s use of hookless (straight side) rims in the 404 Firecrest is integral to Making You Faster. With hookless, the transition between the tire and the rim is more seamless and aero. Zipp’s hookless rims have more efficient resin distribution, which means lighter, stronger wheels. Outdoor testing commissioned by Zipp revealed the real-world gains of Zipp TSE. A bike- and-rider system weighing 85kg (187lbs) on the new 404 Firecrest with 25mm tires required 286 watts to maintain a speed of 40kph. That’s a 4-watt savings compared with the previous model 404 Firecrest. At the center of the 404 Firecrest Tubeless Disc-brake is a versatile and durable hubset, the German-engineered ZR1 DB. If you had to choose just one wheel for road riding and racing, the 404 Firecrest Tubeless Disc brake is a savvy and speedy choice. Technology: Total System Efficiency ABLC Dimples Features: Versatile race wheelset for the modern road race bike with tubeless and hookless rim profile Optimized tire bed for easy tire installation Wide 23mm rim profile creates a better tire interface to be fast on or off the road New ZR1 DB hub is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagement Ships with 12mm front and rear end caps Center locking rotor interface. Lockring is included with the wheels XDR or SRAM/Shimano driver bodies Campagnolo driver body sold separately The 404 Firecrest Tubeless Disc-brake is about 370 grams lighter than its predecessor 1450g wheelset* Front 660g Rear 790g Lifetime Warranty *Lightest configuration: 12mm through axles and XDR body. No tape or valve included in weight
45mm Deep The 45mm deep 303 Firecrest delivers unmatched aero performance when used with the wide tires that today’s riding demands. Zipp has achieved this with a wide disc-specific rim design featuring ABLC dimples extending all the way to the outer edge of the rim. In addition to achieving AeroBalance™, the industry-leading crosswind stability and low aerodynamic drag that defines all Firecrest wheels, the new 303 Firecrest delivers lower drag than the outgoing version when used with 25c or wider tyres. The aerodynamic performance gap between a narrower rim and the new 303 grows even larger with 28c and wider tyres thanks to a smoother transition between the tyre’s profile and Zipp's new rim shape. Tubeless Rim Designed from the start as a tubeless rim, the 303 Firecrest features a rim bed made with internal ridges to lock the tyre’s bead in place, ensuring secure performance, even when ridden at lower tyre pressures. Setup tubeless and emblazoned with your choice of three colour decal options (optional extra), 303 Firecrest wheels are as alluring as they are easy to use. And should you choose to run tubed tyres, the new 303 is fully compatible. Durable Carbon Layup A new carbon fibre layup keeps weight low while maintaining the 303’s legendary durability. The rim’s lightweight design allows the 303 to glide up the steepest climbs while their robust 77D front hub, paired with 24 Sapim® CX-Ray spokes, keep the wheel stiff and responsive. To ensure compatibility with any bike, Zipp's versatile 77D hub comes with swappable end caps to work with QR’s and thru-axles, including 12x100mm and 15x100mm front thru-axles. And like all Zipp carbon wheels, the new 303 Firecrest is laid up, moulded, drilled and assembled in Indianapolis, USA. Built to take you to places you’ve never been, the 303 Firecrest® Tubeless Carbon Cincher will go the distance. It’ll just take less time. Each Wheel Includes: Zipp Tubeless valve extender and valve-core wrench Zipp rim tape (factory taped) Zipp Tangente quick-release skewer Zipp thru-axle end caps
Zipp’s 404 Firecrest Tubeless Disc-brake is the icon of speed with three decades of use. The 404’s heritage as Zipp’s icon of speed extends back decades, and its future is even brighter. At 58mm deep, the 404 Firecrest Tubeless is ideal for road races, time trial and triathlon, and gran fondos. The wheelset’s 23mm internal width is perfect for running wider tubeless tires at reduced air pressure. That is a vital component of Total System Efficiency, or TSE, an approach to speed on ever-changing roads and riding conditions. Specifically, TSE focuses on overcoming specific barriers to speed: wind resistance, gravity, rolling resistance, and vibration losses. Zipp’s ABLC Sawtooth Technology uses an intricate dimpling pattern to improve aero efficiency. Zipp’s use of hookless (straight side) rims in the 404 Firecrest is integral to Making You Faster. With hookless, the transition between the tire and the rim is more seamless and aero. Zipp’s hookless rims have more efficient resin distribution, which means lighter, stronger wheels. Outdoor testing commissioned by Zipp revealed the real-world gains of Zipp TSE. A bike- and-rider system weighing 85kg (187lbs) on the new 404 Firecrest with 25mm tires required 286 watts to maintain a speed of 40kph. That’s a 4-watt savings compared with the previous model 404 Firecrest. At the center of the 404 Firecrest Tubeless Disc-brake is a versatile and durable hubset, the German-engineered ZR1 DB. If you had to choose just one wheel for road riding and racing, the 404 Firecrest Tubeless Disc brake is a savvy and speedy choice. Technology: Total System Efficiency ABLC Dimples Features: Versatile race wheelset for the modern road race bike with tubeless and hookless rim profile Optimized tire bed for easy tire installation Wide 23mm rim profile creates a better tire interface to be fast on or off the road New ZR1 DB hub is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagement Ships with 12mm front and rear end caps Center locking rotor interface. Lockring is included with the wheels XDR or SRAM/Shimano driver bodies Campagnolo driver body sold separately The 404 Firecrest Tubeless Disc-brake is about 370 grams lighter than its predecessor 1450g wheelset* Front 660g Rear 790g Lifetime Warranty *Lightest configuration: 12mm through axles and XDR body. No tape or valve included in weight
Zipp’s 303 Firecrest® Tubeless Disc-brake wheelset is designed for the real world… a world of imperfect conditions, road surfaces, and elements where the bottom line is simple. Efficiency = speed. It’s faster, lighter, and more capable over varied terrain—whether the surface is pavement in all its conditions or no pavement at all. Deeply rooted in Zipp’s drive to conquer the Spring Classics, the new 303 Firecrest is remade with a purpose-made approach for the demands of modern road bikes. When it comes to going fast on a bicycle, efficiency means reduced: Wind resistance, rolling resistance, rider fatigue, weight. The 303 Firecrest Tubeless Disc-brake was designed using real-world direct measurements (vs. primarily wind tunnel or computer simulation). The results were huge. Its rim is slightly more bulbous in design than its predecessor, with a 32mm outside width, a 25mm internal width, and a 40mm rim depth. The profile provides low drag and an improved transition between rim and tire, boosting aero efficiency on the road. The wide rim stance also features less tire deflection for reduced rolling resistance. The combination of the wider tire, increased tire volume, and lower tire pressure helps to reduce rider fatigue by smoothing out the ride over imperfect pavement and road conditions—the tire and wheel system absorbs the shaking, not the rider. At the center of the 303 Firecrest Tubeless Disc brake is a versatile and durable new hubset, the German-engineered ZR1 DB. This hubset features 66 points of engagement for quicker response. The 303 Firecrest Tubeless Disc-brake wheelset is for dedicated cyclists who aspire to the latest in technology. Its competitors… in races, against peers, or simply conquering personal limits. This is about becoming faster and matching your motivation to the most advanced technology. Features: New Zipp graphics and cosmetic identity that scream speed Versatile endurance wheelset for the modern road bike with tubeless and hookless rim profile Lighter Weight than its predecessor, making it nimble and fast. Tubeless Made Easy, optimized tire bed sign allows for simple tool-free installation and removal with no need for an air compressor to seat the tire. Ultra-wide 25mm rim profile creates a better tire interface to be fast on or off the road New 40mm rim depth makes a light and aero wheel in every situation New ZR1 DB hub is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagement Ships with 12mm front and rear end caps Center locking rotor interface. Lockring is included with the wheels XDR™ or SRAM/Shimano driver bodies Campagnolo driver body sold separately
Zipp has equipped this model with tubeless tyre compatibility, so you can enjoy the benefits of superior stability and control as well as a lighter overall weight. Another highlight of this version is its disc brake compatibility, which means that you'll benefit from powerful and consistent braking performance during the most unpredictable of road conditions. Zipp’s 303 Firecrest Tubeless Disc-brake rear wheel is designed for the real world… a world of imperfect conditions, road surfaces, and elements where the bottom line is simple. Efficiency = speed. It’s faster, lighter, and more capable over varied terrain—whether the surface is pavement in all its conditions or no pavement at all. Deeply rooted in Zipp’s drive to conquer the Spring Classics, the 303 Firecrest is remade with a purpose-made approach for the demands of modern road bikes. When it comes to going fast on a bicycle, efficiency means reduced: Wind resistance, rolling resistance, rider fatigue, weight. Designed using real-world direct measurements (vs. primarily wind tunnel or computer simulation). The results were huge. Its rim is slightly more bulbous in design than its predecessor, with a 30mm outside width, a 25mm internal width, and a 40mm rim depth. The profile provides low drag and an improved transition between rim and tyre, boosting aero efficiency on the road. The wide rim stance also features less tyre deflection for reduced rolling resistance. The combination of the wider tyre, increased tyre volume, and lower tyre pressure helps to reduce rider fatigue by smoothing out the ride over imperfect pavement and road conditions—the tyre and wheel system absorbs the shaking, not the rider. At the centre of the 303 Firecrest Tubeless Disc brake rear wheel is a versatile and durable hubset, the German-engineered ZR1 DB. This hubset features 66 points of engagement for quicker response. The 303 Firecrest Tubeless Disc-brake rear wheel is for dedicated cyclists who aspire to the latest in technology. Its competitors… in races, against peers, or simply conquering personal limits. This is about becoming faster and matching your motivation to the most advanced technology. Item Top Features Continued: Driver Body Type: Multiple options available to select Axle Type: TA 12x142 Bearings: Cartridge - Steel Driver Mechanism: 6 Pawls Leaf Spring Weight: 842g (approx) Technologies: - Zipp graphics and cosmetic identity that scream speed - Versatile endurance wheelset for the modern road bike with tubeless and hookless rim profile - Lighter weight than its predecessor, making it nimble and fast - Tubeless Made Easy, optimised tyre bed sign allows for simple tool-free installation and removal with no need for an air compressor to seat the tyre - Ultra-wide 25mm rim profile creates a better tyre interface to be fast on or off the road - 40mm rim depth makes a light and aero wheel in every situation - ZR1 DB hub is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagement - Center locking rotor interface. Lockring is included with the wheels - XDR or SRAM/Shimano driver bodies (select option separately) - Campagnolo driver body sold separately
Zipp 303 Firecrest Carbon Tubeless Rear WheelEngineered to meet the demands of modern road bike adventures, this rear wheel features a hookless carbon rim construction, which allows it to deliver incredibly fast and smooth rolling performance. Zipp has equipped this model with tubeless tyre compatibility, so you can enjoy the benefits of superior stability and control as well as a lighter overall weight. Another highlight of this version is its disc brake compatibility, which means that you'll benefit from powerful and consistent braking performance during the most unpredictable of road conditions.Zipp's 303 Firecrest Tubeless Disc-brake rear wheel is designed for the real world… a world of imperfect conditions, road surfaces, and elements where the bottom line is simple. Efficiency = speed. It's faster, lighter, and more capable over varied terrain—whether the surface is pavement in all its conditions or no pavement at all. Deeply rooted in Zipp's drive to conquer the Spring Classics, the 303 Firecrest is remade with a purpose-made approach for the demands of modern road bikes. When it comes to going fast on a bicycle, efficiency means reduced: Wind resistance, rolling resistance, rider fatigue, weight. Designed using real-world direct measurements (vs. primarily wind tunnel or computer simulation). The results were huge. Its rim is slightly more bulbous in design than its predecessor, with a 30mm outside width, a 25mm internal width, and a 40mm rim depth. The profile provides low drag and an improved transition between rim and tyre, boosting aero efficiency on the road. The wide rim stance also features less tyre deflection for reduced rolling resistance. The combination of the wider tyre, increased tyre volume, and lower tyre pressure helps to reduce rider fatigue by smoothing out the ride over imperfect pavement and road conditions—the tyre and wheel system absorbs the shaking, not the rider. At the centre of the 303 Firecrest Tubeless Disc brake rear wheel is a versatile and durable hubset, the German-engineered ZR1 DB. This hubset features 66 points of engagement for quicker response. The 303 Firecrest Tubeless Disc-brake rear wheel is for dedicated cyclists who aspire to the latest in technology. Its competitors… in races, against peers, or simply conquering personal limits. This is about becoming faster and matching your motivation to the most advanced technology.Features: Rim Material: Hookless Carbon Tyre Compatibility: Tubeless tyres only Brake Compatibility: Disc (Center Lock) Rim Inside Width: 25mm Rim Profile: Symmetrical Rim Finish: UD fibre, adhesive decals Nipple Material: Aluminium Spoke Type: CX-Ray Spoke Count: 24 Spoke Pattern: 2 Cross Driver Body Type: Multiple options available to select Axle Type: TA 12x142 Bearings: Cartridge - Steel Driver Mechanism: 6 Pawls Leaf Spring Weight: 842g (approx)Technologies: Zipp graphics and cosmetic identity that scream speed Versatile endurance wheelset for the modern road bike with tubeless and hookless rim profile Lighter Weight than its predecessor, making it nimble and fast Tubeless Made Easy, optimised tyre bed sign allows for simple tool-free installation and removal with no need for an air compressor to seat the tyre Ultra-wide 25mm rim profile creates a better tyre interface to be fast on or off the road 40mm rim depth makes a light and aero wheel in every situation ZR1 DB hub is engineered in Germany with better seal design for improved durability and quicker response with 66 points of engagement Center locking rotor interface. Lockring is included with the wheels XDR or SRAM/Shimano driver bodies Campagnolo driver body sold separatelyBuy Zipp Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.