iXS XULT DH FF HelmetThe iXS XULT DH FF Helmet has been made for those of you who get your mountain biking excitement from riding at top speed downhill and flying over Bike park features. If you're fueled by the adrenalin rush of high-speed downhills and the biggest booters, you'll certainly love the confidence-inspiring performance of the XULT DH FF Helmet. It's packed with features that promote safety and deliver unrivalled comfort and ventilation.Protection EvolvedAn evolution of the original XULT, this iteration has been redesigned with a sleek new outer shell, improved placement of ventilation channels, a silicone goggle-strap grip, and the inclusion of washable comfort lining. The result is even better comfort and performance for the DH rider who wants the most helmet for their money.X-Matter x FRP ShellIn order to keep your head safer when you take a hard slam the Xult combines iXS' X-Matter and FRP technologies.The X-Matter design sees a safety rail sandwiched between the EPS and the outer shell. A series of inserts are engineered to act as a buffer between the outer shell and EPS foam liner. This system both absorbs and dissipates impact energies but also offsets rotational forces in the event of a crash.Meanwhile, the FRP (fibre reinforced polymer) shell allows iXS to trim bulk and weight without compromising safety or durability. The lightweight nature of the shell also reduces the effects of rotational forces on the head and thus lessens the risk of brain injury.Vortex Ventilation SystemRowdy riding will soon see you working up some heat. But that's not a problem thanks to the Vortex Ventilation System. Large external vents feed directly into large internal air channels and out to the rear exhaust vents. This creates a cool rush of air over the head and ensures warm, sweaty air doesn't hang around inside.The Xult full-face also comes equipped with an ergonomic padding system, with specially designed cheek padding, guaranteeing a high degree of riding comfort and a secure and comfortable fit.Features:FRP reinforced helmet shellVortex ventilation system with integrated air channelsX-matter/X-rail impact absorption linerAdjustable visorWashable paddingDouble-D safety closureEN1078, CPSC, ASTMWeight: 990g (approx)Size: S/M 53-56cm, M/L 57-59cm, L/XL 60-62cmBuy iXS Protection from Chain Reaction Cycles, the World's Largest Online Bike Store.
iXS XULT DH FF HelmetThe iXS XULT DH FF Helmet has been made for those of you who get your mountain biking excitement from riding at top speed downhill and flying over Bike park features. If you're fueled by the adrenalin rush of high-speed downhills and the biggest booters, you'll certainly love the confidence-inspiring performance of the XULT DH FF Helmet. It's packed with features that promote safety and deliver unrivalled comfort and ventilation.Protection EvolvedAn evolution of the original XULT, this iteration has been redesigned with a sleek new outer shell, improved placement of ventilation channels, a silicone goggle-strap grip, and the inclusion of washable comfort lining. The result is even better comfort and performance for the DH rider who wants the most helmet for their money.X-Matter x FRP ShellIn order to keep your head safer when you take a hard slam the Xult combines iXS' X-Matter and FRP technologies.The X-Matter design sees a safety rail sandwiched between the EPS and the outer shell. A series of inserts are engineered to act as a buffer between the outer shell and EPS foam liner. This system both absorbs and dissipates impact energies but also offsets rotational forces in the event of a crash.Meanwhile, the FRP (fibre reinforced polymer) shell allows iXS to trim bulk and weight without compromising safety or durability. The lightweight nature of the shell also reduces the effects of rotational forces on the head and thus lessens the risk of brain injury.Vortex Ventilation SystemRowdy riding will soon see you working up some heat. But that's not a problem thanks to the Vortex Ventilation System. Large external vents feed directly into large internal air channels and out to the rear exhaust vents. This creates a cool rush of air over the head and ensures warm, sweaty air doesn't hang around inside.The Xult full-face also comes equipped with an ergonomic padding system, with specially designed cheek padding, guaranteeing a high degree of riding comfort and a secure and comfortable fit.Features:FRP reinforced helmet shellVortex ventilation system with integrated air channelsX-matter/X-rail impact absorption linerAdjustable visorWashable paddingDouble-D safety closureEN1078, CPSC, ASTMWeight: 990g (approx)Size: S/M 53-56cm, M/L 57-59cm, L/XL 60-62cmBuy iXS Protection from Chain Reaction Cycles, the World's Largest Online Bike Store.
iXS XULT DH FF HelmetThe iXS XULT DH FF Helmet has been made for those of you who get your mountain biking excitement from riding at top speed downhill and flying over Bike park features. If you're fueled by the adrenalin rush of high-speed downhills and the biggest booters, you'll certainly love the confidence-inspiring performance of the XULT DH FF Helmet. It's packed with features that promote safety and deliver unrivalled comfort and ventilation.Protection EvolvedAn evolution of the original XULT, this iteration has been redesigned with a sleek new outer shell, improved placement of ventilation channels, a silicone goggle-strap grip, and the inclusion of washable comfort lining. The result is even better comfort and performance for the DH rider who wants the most helmet for their money.X-Matter x FRP ShellIn order to keep your head safer when you take a hard slam the Xult combines iXS' X-Matter and FRP technologies.The X-Matter design sees a safety rail sandwiched between the EPS and the outer shell. A series of inserts are engineered to act as a buffer between the outer shell and EPS foam liner. This system both absorbs and dissipates impact energies but also offsets rotational forces in the event of a crash.Meanwhile, the FRP (fibre reinforced polymer) shell allows iXS to trim bulk and weight without compromising safety or durability. The lightweight nature of the shell also reduces the effects of rotational forces on the head and thus lessens the risk of brain injury.Vortex Ventilation SystemRowdy riding will soon see you working up some heat. But that's not a problem thanks to the Vortex Ventilation System. Large external vents feed directly into large internal air channels and out to the rear exhaust vents. This creates a cool rush of air over the head and ensures warm, sweaty air doesn't hang around inside.The Xult full-face also comes equipped with an ergonomic padding system, with specially designed cheek padding, guaranteeing a high degree of riding comfort and a secure and comfortable fit.Features:FRP reinforced helmet shellVortex ventilation system with integrated air channelsX-matter/X-rail impact absorption linerAdjustable visorWashable paddingDouble-D safety closureEN1078, CPSC, ASTMWeight: 990g (approx)Size: S/M 53-56cm, M/L 57-59cm, L/XL 60-62cmBuy iXS Protection from Chain Reaction Cycles, the World's Largest Online Bike Store.
iXS XULT DH FF HelmetThe iXS XULT DH FF Helmet has been made for those of you who get your mountain biking excitement from riding at top speed downhill and flying over Bike park features. If you're fueled by the adrenalin rush of high-speed downhills and the biggest booters, you'll certainly love the confidence-inspiring performance of the XULT DH FF Helmet. It's packed with features that promote safety and deliver unrivalled comfort and ventilation.Protection EvolvedAn evolution of the original XULT, this iteration has been redesigned with a sleek new outer shell, improved placement of ventilation channels, a silicone goggle-strap grip, and the inclusion of washable comfort lining. The result is even better comfort and performance for the DH rider who wants the most helmet for their money.X-Matter x FRP ShellIn order to keep your head safer when you take a hard slam the Xult combines iXS' X-Matter and FRP technologies.The X-Matter design sees a safety rail sandwiched between the EPS and the outer shell. A series of inserts are engineered to act as a buffer between the outer shell and EPS foam liner. This system both absorbs and dissipates impact energies but also offsets rotational forces in the event of a crash.Meanwhile, the FRP (fibre reinforced polymer) shell allows iXS to trim bulk and weight without compromising safety or durability. The lightweight nature of the shell also reduces the effects of rotational forces on the head and thus lessens the risk of brain injury.Vortex Ventilation SystemRowdy riding will soon see you working up some heat. But that's not a problem thanks to the Vortex Ventilation System. Large external vents feed directly into large internal air channels and out to the rear exhaust vents. This creates a cool rush of air over the head and ensures warm, sweaty air doesn't hang around inside.The Xult full-face also comes equipped with an ergonomic padding system, with specially designed cheek padding, guaranteeing a high degree of riding comfort and a secure and comfortable fit.Features:FRP reinforced helmet shellVortex ventilation system with integrated air channelsX-matter/X-rail impact absorption linerAdjustable visorWashable paddingDouble-D safety closureEN1078, CPSC, ASTMWeight: 990g (approx)Size: S/M 53-56cm, M/L 57-59cm, L/XL 60-62cmBuy iXS Protection from Chain Reaction Cycles, the World's Largest Online Bike Store.
iXS XULT DH FF HelmetThe iXS XULT DH FF Helmet has been made for those of you who get your mountain biking excitement from riding at top speed downhill and flying over Bike park features. If you're fueled by the adrenalin rush of high-speed downhills and the biggest booters, you'll certainly love the confidence-inspiring performance of the XULT DH FF Helmet. It's packed with features that promote safety and deliver unrivalled comfort and ventilation.Protection EvolvedAn evolution of the original XULT, this iteration has been redesigned with a sleek new outer shell, improved placement of ventilation channels, a silicone goggle-strap grip, and the inclusion of washable comfort lining. The result is even better comfort and performance for the DH rider who wants the most helmet for their money.X-Matter x FRP ShellIn order to keep your head safer when you take a hard slam the Xult combines iXS' X-Matter and FRP technologies.The X-Matter design sees a safety rail sandwiched between the EPS and the outer shell. A series of inserts are engineered to act as a buffer between the outer shell and EPS foam liner. This system both absorbs and dissipates impact energies but also offsets rotational forces in the event of a crash.Meanwhile, the FRP (fibre reinforced polymer) shell allows iXS to trim bulk and weight without compromising safety or durability. The lightweight nature of the shell also reduces the effects of rotational forces on the head and thus lessens the risk of brain injury.Vortex Ventilation SystemRowdy riding will soon see you working up some heat. But that's not a problem thanks to the Vortex Ventilation System. Large external vents feed directly into large internal air channels and out to the rear exhaust vents. This creates a cool rush of air over the head and ensures warm, sweaty air doesn't hang around inside.The Xult full-face also comes equipped with an ergonomic padding system, with specially designed cheek padding, guaranteeing a high degree of riding comfort and a secure and comfortable fit.Features:FRP reinforced helmet shellVortex ventilation system with integrated air channelsX-matter/X-rail impact absorption linerAdjustable visorWashable paddingDouble-D safety closureEN1078, CPSC, ASTMWeight: 990g (approx)Size: S/M 53-56cm, M/L 57-59cm, L/XL 60-62cmBuy iXS Protection from Chain Reaction Cycles, the World's Largest Online Bike Store.
iXS XULT DH FF HelmetThe iXS XULT DH FF Helmet has been made for those of you who get your mountain biking excitement from riding at top speed downhill and flying over Bike park features. If you're fueled by the adrenalin rush of high-speed downhills and the biggest booters, you'll certainly love the confidence-inspiring performance of the XULT DH FF Helmet. It's packed with features that promote safety and deliver unrivalled comfort and ventilation.Protection EvolvedAn evolution of the original XULT, this iteration has been redesigned with a sleek new outer shell, improved placement of ventilation channels, a silicone goggle-strap grip, and the inclusion of washable comfort lining. The result is even better comfort and performance for the DH rider who wants the most helmet for their money.X-Matter x FRP ShellIn order to keep your head safer when you take a hard slam the Xult combines iXS' X-Matter and FRP technologies.The X-Matter design sees a safety rail sandwiched between the EPS and the outer shell. A series of inserts are engineered to act as a buffer between the outer shell and EPS foam liner. This system both absorbs and dissipates impact energies but also offsets rotational forces in the event of a crash.Meanwhile, the FRP (fibre reinforced polymer) shell allows iXS to trim bulk and weight without compromising safety or durability. The lightweight nature of the shell also reduces the effects of rotational forces on the head and thus lessens the risk of brain injury.Vortex Ventilation SystemRowdy riding will soon see you working up some heat. But that's not a problem thanks to the Vortex Ventilation System. Large external vents feed directly into large internal air channels and out to the rear exhaust vents. This creates a cool rush of air over the head and ensures warm, sweaty air doesn't hang around inside.The Xult full-face also comes equipped with an ergonomic padding system, with specially designed cheek padding, guaranteeing a high degree of riding comfort and a secure and comfortable fit.Features:FRP reinforced helmet shellVortex ventilation system with integrated air channelsX-matter/X-rail impact absorption linerAdjustable visorWashable paddingDouble-D safety closureEN1078, CPSC, ASTMWeight: 990g (approx)Size: S/M 53-56cm, M/L 57-59cm, L/XL 60-62cmBuy iXS Protection from Chain Reaction Cycles, the World's Largest Online Bike Store.
Shimano Ultegra WH-6800-R Freehub BodyCompatible with both the Ultegra 6800 and Dura-Ace 9000 rear hubs, this freehub body will breathe new life back into your Shimano rear wheel. Compatible with 9, 10 and 11-Speed Shimano/SRAM road bike cassettes it will have your road bike’s rear wheel working like it’s just come out of the box.Features:Genuine Shimano replacement part Compatibility: Ultegra 6800 and Dura-Ace 9000 rear hubs Speed: 10, 11-Speed Shimano/SRAM road bike cassettes Manufacturer's Part Number: Y49398060 Buy Shimano Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.
Shimano Ultegra RS700 C30 TL Road WheelsetCarefully engineered by Shimano to deliver responsive handling and direct rider to road power transfer, the Ultegra RS700 C30 TL Road Wheelset is an ideal choice for demanding cyclists. Rolling on a carbon fibre rim with an alloy braking surface, it brings you efficient acceleration and a low overall weight. A front and rear specific rim height profile give you the ideal balance of crosswind stability and rigidity.Road Wheels with Sealed HubsThe hubs feature high-quality contact seals combined with cup and cone bearings that provide smooth rolling and consistent performance. The rear wheel features Shimano OPTBAL 2:1 spoke lacing, where the drive side has twice as many spokes as the non-drive side. This 2:1 spoke lacing increases stiffness and rigidity, and is especially noticeable when putting the power down.Features: Material: Rims: Carbon; Braking Surface: Aluminium; Hubs: Alloy; Spokes: Stainless Steel; Freehub Body: Steel; Nipples: Aluminium Tyre Type: Clincher Tubeless Ready: Yes Rim Profile: Front: 24mm; Rear: 28mm Rim External Width: 20.8mm Rim Internal Width: 15mm Braking System: Rim brake Axle Compatibility: Quick Release Spoke Type: Straightpull, double butted, aero Spoke Count: Front: 16 (radial); Rear: 21 (crossed) Minimum Valve Length: 40mm Weight: 1.56kgBuy Shimano Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.
Shimano Ultegra RS700 C30 Road Front WheelThis clincher front wheel is tubeless ready and is a dependable performer. Featuring a smooth carbon surface mixed with a high-level alloy construction, this model is developed to provide exceptional efficiency, acceleration & stability. The hubs feature high-quality contact seals and the legendary, highly adjustable Shimano cup and cone bearings that provide silky smooth rolling prowess and consistent performance. This wheel has been laced using high-end straight-pull, double-butted aero spokes for increased aerodynamics and dramatically increases stiffness and rigidity, which is very noticeable when sprinting and powering out the watts.Features: Rim Material: Carbon, Aluminium Braking Surface Material: Aluminium Hub Material: Aluminium Spokes Material: Stainless Steel Freehub Body Material: Steel Use: Road Tyre Type: Clincher, Tubeless Ready Rim Profile: 28mm Rim Width: External: 20.8mm; Internal: 15mm Braking System: Rim brake Axle Compatibility: Quick Release Spoke Type: Straightpull, double butted, aero Spoke Count: 21 (crossed) Freehub: 10, 11 speed Single or Pair: Single front wheelA 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.
Shimano Ultegra R8170 C36 Carbon CL Disc WheelThe Ultegra R8170 C36 Carbon CL Disc Wheel from Shimano is the ideal aerodynamic and Tubeless Ready road race wheel for steep climbing events, fast sprints and versatile all-day riding performance. Full carbon rim construction with Shimano D2 rim profile and a centre lock disc rotor mount, this top-tier road bike wheel is stiff, flex free, aerodynamically optimised, will ensure exceptional braking efficiency in all weather conditions.With a shallow-depth aero profile and lively acceleration, the Ultegra R8170 C36 wheelset is a climber's delight that delivers performance every road rider will appreciate. With the speed and efficiency of tubeless tyres, the everyday performance of a shallow, aero profile carbon rim, and the convenience of 11 and 12-speed compatibility, the new Ultegra R8170 C36 wheelset is an upgrade for any road bike. Centre-Lock Disc Rotor MountThe Centre Lock system makes an easy rotor installation possible with a spline mount and a lock ring. The lock ring mounting system reduces the total working hours by shortening the amount of time of both installation and de-installation. In addition, the secure fixing by the spline mount enhances precision and rigidity while improving braking efficiency. D2 Aerodynamic Rim ProfileAerodynamic performance is affected by wind direction. To create the D2 rim, Shimano engineers considered both frontal and crosswinds, aiming to achieve optimal performance in real-world riding conditions. Extensive prototype testing, in the wind tunnel and on the road, proved that a wide rim shape with a deep tire bed performs best across a wide range of conditions. At yaw angles ranging from 0 to 15 degrees, the Shimano D2 rim profile reduces air drag better than others aero shape rims. This rim design also boosts lateral wheel stiffness and offers improved vertical compliance for increased control, comfort and durability on the road. Shimano E-Thru Axle SystemThe tool-less type thru-axle skewer system optimizes rigidity and weight balance and enables easy operation with a reliable internal cam mechanism. The 15 mm thru-axle system is 15% stiffer torsionally and 25% stiffer in transverse shear than a traditional 9 mm quick release front axle system. High rigidity is secured while keeping the optimum weight balance. The E-Thru axle hub system minimizes the distortion of suspension while maintaining lightweight for riding around sharp corners at high speed. Rear Wheel OPTBAL Spoke SystemThe OPTBAL rear wheel spoke system features 21 spokes—14 on the drive side and 7 on the non-drive side. Cassette spacing in today's wheels produces unbalanced tension in traditional 1:1 spoke systems. This unbalance is intensified with the 11-speed cassette, producing nearly double the tension on the drive side spokes. Generally, high and low tension spokes have respectively tendency toward breaking down and coming loose spoke nipples. Unbalanced tension affects durability and strength. The OPTBAL design rebalances spoke tension, enhancing wheel rigidity and strength for a more durable wheel. Features: Series: Ultegra R8100 Series Rim: Carbon Tubeless Ready 36 mm height full Carbon rim Internal Rim Width: 21 mm Shared rim profile with R9200 Dura-Ace wheels Improved aerodynamics Axle: 12 mm E-THRU Disc Rotor Mount: Centre Lock Rear Speeds: 11/12-Speed Shimano Weight: Front: 657g; Rear: 831gA 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Shimano Ultegra R8170 C50 Carbon CL Disc WheelThe Shimano Ultegra R8170 C50 Wheel features a 50mm-deep full carbon tubeless ready rim with Shimano D2 rim profiling. This rim offers exceptional aerodynamic efficiency and agility while maintaining stability and control during strong cross winds. Suited to climbing sessions, long-distance fast events and epic endurance rides, this wheel features a centre lock disc rotor mount and is compatible with Shimano 11 and 12-Speed drivetrain systems.Balancing aerodynamics, weight, and affordability, the new Ultegra R8170 C50 wheelset is sure to inspire action on your group ride with its all-new tubeless carbon rim and updated, 12 and 11-speed compatible hub. Summiting climbs, carving descents, or cruising the flats, the new C50 is the jack of all trades among the new Ultegra R8170 wheel lineup. The tubeless, carbon rim features a 21 mm internal width that pairs nicely with wider, modern tires while the HYPERGLIDE cassette body is compatible with 11 and 12-speed cassettes. Centre-Lock Disc Rotor MountThe Centre Lock system makes an easy rotor installation possible with a spline mount and a lock ring. The lock ring mounting system reduces the total working hours by shortening the amount of time of both installation and de-installation. In addition, the secure fixing by the spline mount enhances precision and rigidity while improving braking efficiency. D2 Aerodynamic Rim ProfileAerodynamic performance is affected by wind direction. To create the D2 rim, Shimano engineers considered both frontal and crosswinds, aiming to achieve optimal performance in real-world riding conditions. Extensive prototype testing, in the wind tunnel and on the road, proved that a wide rim shape with a deep tire bed performs best across a wide range of conditions. At yaw angles ranging from 0 to 15 degrees, the Shimano D2 rim profile reduces air drag better than others aero shape rims. This rim design also boosts lateral wheel stiffness and offers improved vertical compliance for increased control, comfort and durability on the road. Shimano E-Thru Axle SystemThe tool-less type thru-axle skewer system optimizes rigidity and weight balance and enables easy operation with a reliable internal cam mechanism. The 15 mm thru-axle system is 15% stiffer torsionally and 25% stiffer in transverse shear than a traditional 9 mm quick release front axle system. High rigidity is secured while keeping the optimum weight balance. The E-Thru axle hub system minimizes the distortion of suspension while maintaining lightweight for riding around sharp corners at high speed. Rear Wheel OPTBAL Spoke SystemThe OPTBAL rear wheel spoke system features 21 spokes—14 on the drive side and 7 on the non-drive side. Cassette spacing in today's wheels produces unbalanced tension in traditional 1:1 spoke systems. This unbalance is intensified with the 11-speed cassette, producing nearly double the tension on the drive side spokes. Generally, high and low tension spokes have respectively tendency toward breaking down and coming loose spoke nipples. Unbalanced tension affects durability and strength. The OPTBAL design rebalances spoke tension, enhancing wheel rigidity and strength for a more durable wheel. Features: Series: Ultegra R8100 Series Rim: Carbon Tubeless Ready 50mm height full carbon rim Internal Rim Width: 21 mm Shared rim profile with R9200 Dura-Ace wheels Improved aerodynamics Axle: 12 mm E-THRU Rear Speeds: 11/12-Speed Shimano Disc Rotor Mount: Centre Lock Weight: Front: 698g; Rear: 872gA 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Components from Chain Reaction Cycles, the World's Largest Online Bike Store.
Shimano Ultegra R8170 C60 Carbon CL Rear Disc WheelThe Ultegra R8170 C60 Carbon CL Disc Wheel from Shimano features a 60mm-deep full-carbon rim that's ideal for high-speed and flatter race events. Suited to time trial and triathlon races, this wheel is tubeless ready for fast rolling speeds, low rolling inertia and exceptional grip in all conditions. And it's compatible with Shimano 11 and 12-Speed gear systems and it features a centre lock rotor mount for use with disc brakes.Designed for the highest speed environments and modern tyre widths, the Ultegra C60 wheelset shares its all-carbon rim profile with Dura-Ace but employs a hub that is compatible with both 11 and 12-speed cassettes. For situations where aerodynamics is the priority, the new Ultegra R8170 C60 wheelset features an all-carbon, 21 mm internal, tubeless compatible rim and a super-fast cup and cone bearing hub that is compatible with both 11 and 12-speed cassettes.Centre-Lock Disc Rotor MountThe Centre Lock system makes an easy rotor installation possible with a spline mount and a lock ring. The lock ring mounting system reduces the total working hours by shortening the amount of time of both installation and de-installation. In addition, the secure fixing by the spline mount enhances precision and rigidity while improving braking efficiency. D2 Aerodynamic Rim ProfileAerodynamic performance is affected by wind direction. To create the D2 rim, Shimano engineers considered both frontal and crosswinds, aiming to achieve optimal performance in real-world riding conditions. Extensive prototype testing, in the wind tunnel and on the road, proved that a wide rim shape with a deep tire bed performs best across a wide range of conditions. At yaw angles ranging from 0 to 15 degrees, the Shimano D2 rim profile reduces air drag better than others aero shape rims. This rim design also boosts lateral wheel stiffness and offers improved vertical compliance for increased control, comfort and durability on the road. Rear Wheel OPTBAL Spoke SystemThe OPTBAL rear wheel spoke system features 21 spokes—14 on the drive side and 7 on the non-drive side. Cassette spacing in today's wheels produces unbalanced tension in traditional 1:1 spoke systems. This unbalance is intensified with the 11-speed cassette, producing nearly double the tension on the drive side spokes. Generally, high and low tension spokes have respectively tendency toward breaking down and coming loose spoke nipples. Unbalanced tension affects durability and strength. The OPTBAL design rebalances spoke tension, enhancing wheel rigidity and strength for a more durable wheel. Features: Series: Ultegra R8100 Series Rim: Carbon Tubeless Ready 60 mm height full carbon rim Internal Rim Width: 21mm Shared rim profile with R9200 Dura-Ace wheels Improved aerodynamics Axle Size: 12x142mm Rear Speeds: 11/12-Speed Shimano Disc Rotor Mount: Centre Lock Single or Pair: Single, rear wheel only Weight: 911gA 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products).Buy Shimano Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.