Shimano ST-R7170 105 Di2 Hydraulic Disc SetCombining Shimano's renowned Di2 wireless technology with its 105 series, this hydraulic disc brake set is an ideal choice for riders who have only experienced mechanical shifting previously and want to make the switch to electronic wireless shifting. Delivering high level performance at a more affordable price, this set includes 1x ST-R7170 Dual Control Lever (DCL) and 1x BR-R7170 Flat Mount Brake Caliper. With its powerful braking performance and precise shifting technology, this bundle is all set for long days out on the road.ST-R7170 105 Di2 Double Hydraulic LeverThis Shimano 105 shift/brake lever features Di2 electronic shifting for the first time, bringing precise, intuitive gear changes to even more riders. Not only does it offer worry-free Di2 shifting in a compact shifter size, but it also features technologies such as Reach Adjust and customised button functions that allow you to dial in your ideal ergonomics.BR-R7170 105 Flat Mount Brake CaliperWith proven hydraulic braking technology, the Shimano 105 caliper features the Shimano Flat Mount System and its low-profile design that is ideal for road bikes. More compact and lighter than ever, the R7170 brakes offer wide pad clearance for easy wheel removal and quiet performance as well as one-way bleeding for easy, clean maintenance.Digital Integrated IntelligenceThe revolutionary DI2 shifting system solves the challenges drivetrains present to the power-delivery equation in cycling. DI2 gives you instant, accurate, lightning-fast shifts the first and every time, at the push of a button. Even in the most extreme conditions, shifting is precise and controlled. You can change gear even under heavy load while climbing or accelerating. With DI2, you are in complete control.Shimano 105 Di2 brings electronic wireless shifting to a new set of riders. For those who have only experienced mechanical shifting and ergonomics, Shimano 105 Di2 represents a transformation of the road cycling experience.Features: Shifter/Brake Type: 1x ST-R7170 Dual Control Lever (DCL) Caliper Type: 1x BR-R7170 Flat Mount Brake Caliper Use: Road Speed: 12 speed Di2 Connectivity: Wireless Di2 shifting Battery Type: CR1632 x 2 Brake Lever Clamp Band: 23.8 - 24.2mm Number of Pistons: 2 Firmware Update by E-Tube Project: Yes Single or Pair: SingleTechnologies: Reach Adjust: This model's brake lever is equipped with a Reach Adjust mechanism. The distance from the handlebar grip to lever can be adjusted to suit any hand size, type of riding and individual rider preferences. E-Tube Project: Shimano's genuine application E-Tube Project Cyclist allows you to customise your bike, update firmware, and maintain it by connecting it wirelessly to your bike. You can also get the more detailed bike maintenance by connecting to your bike by wire with E-Tube Project Professional application. Dual Control Lever: DCL stands for Dual Control Lever. It has brake and shifting functions in the system and enables easy operation. Ergonomic innovation is probably more critical to the higher standard performance than the added gearing. The shift internals borrow the robustness from Shimano's MTB technology and are so smooth and effortless that one finger shifts front and rear are possible. Indeed, shifting is the ultimate act of Shimano Total Integration, and simply has to be experienced to be understood. Ice Technologies: The fade, which can occur to disc brake rotor and pad when braking on a long downhill ride, for instance, has a negative impact on the braking performance. Shimano has adopted the Ice Technologies piston to realise the cooling technology for consistent performance. Oversized pistons transfer hydraulic power directly to the brake pad, and ceramic material is used to avoid heat transfer for constant stable braking, providing efficient stopping power transfer without loss. This model's Ice Technologies piston achieves optimised lightweight, high rigidity and heat dissipation. One Way Bleeding: One Way Bleeding was developed for quick and easy prevention of air in the hydraulic system. Shimano has streamlined the oil route throughout the system to prevent air bubbles from being captured in the system. One way oil routing plus a funnel tool with mineral oil provides an easy and clean bleeding system.Manufacturer's Part Numbers: R7170DRF Black Front Right R7170DLR Black Rear Left A 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 ST-R7170 105 Double Hydraulic Di2 LeverBringing electronic wireless Di2 shifting to a new set of riders, this shift/braker lever combines industry-leading functionality with trickle-down technologies from the Dura-Ace and Ultegra series. After years of research and development, Shimano's 105 series now offers Di2 electronic shifting for the first time, bringing precise, intuitive gear changes to even more riders. Not only does it offer worry-free Di2 shifting in a compact shifter size, but it also features technologies such as Reach Adjust and customised button functions that allow you to dial in your ideal ergonomics. For those who have only experienced mechanical shifting and ergonomics, this model marks a new era of affordable performance.Reach AdjustThis model's brake lever is equipped with a Reach Adjust mechanism. The distance from the handlebar grip to lever can be adjusted to suit any hand size, type of riding and individual rider preferences.E-Tube ProjectShimano's genuine application E-Tube Project Cyclist allows you to customise your bike, update firmware, and maintain it by connecting it wirelessly to your bike. You can also get the more detailed bike maintenance by connecting to your bike by wire with E-Tube Project Professional application.Dual Control LeverDCL stands for Dual Control Lever. It has brake and shifting functions in the system and enables easy operation. Ergonomic innovation is probably more critical to the higher standard performance than the added gearing. The shift internals borrow the robustness from Shimano's MTB technology and are so smooth and effortless that one finger shifts front and rear are possible. Indeed, shifting is the ultimate act of Shimano Total Integration, and simply has to be experienced to be understood.Features: Shifter Type: Dual Control Lever (DCL) Use: Road Speed: 12 speed Di2 Connectivity: Wireless Di2 shifting Battery Type: CR1632 x 2 Recommended Brake Caliper: BR-R7170 (available separately) Brake Lever Clamp Band: 23.8 - 24.2mm Firmware Update by E-Tube Project: Yes Mineral Oil: Shimano Mineral Oil Adjustments: Reach Adjust, Free Stroke Adjust, Funnel Bleeding Single or Pair: Single, sold individuallyTechnologies: Clean Cockpit: Wireless connection enhances the aesthetic of your bike while keeping shifting lightning fast. Longer lasting: Uses two CR1632 batteries (battery life: 3.5 to 4 years). Compact, ergonomic performance cascaded from Dura-Ace. Raised hood peak improves ergonomics, while a longer hood body increases hand support. Make Dura-Ace yours with custom button function and adjustable ergonomics. Easily change button function with the E-Tube app. Find your optimum lever position with simple reach adjust.Manufacturer's Part Numbers: STR7170L Black Left Hand STR7170R Black Right HandA 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 GRX 600 2x11 Speed Gravel Disc BrakeThis stunning disc brake provides you with the stopping power and precision needed to tackle all the challenges of gravel riding. Its off-road inspired lever and bracket ergonomics deliver superior mixed terrain control, so you can easily ride across rough roads even in muddy conditions. Shimano has also raised the benchmark for maintaining a strong grip and modulation in any conditions by making the lever from anti-slip construction. Adjustable Gravel Disc BrakeFeaturing some of the best Shimano technologies available, you'll be able to conquer your next adventure, wherever the road takes you. Its reach adjust technology allows you to precisely customise its feel to suit your hand size, riding style and individual rider preferences. Topping it off is its Servo Wave Action technology which delivers fast braking efficiency between your pads and rotor, so you can enjoy more rapid braking power and control. Features: Use: Gravel, Road Speed: 2x11 speed Oil: Mineral oil Reach Adjust: Tooled Clamp Band Inner Diameter: 23.8 - 24.2mm Type: Dual control lever Technologies:Reach Adjust: Its brake lever is equipped with a reach adjust mechanism. The distance from handlebar grip to lever can be adjusted to suit any hand size, type of riding and individual rider preferences. Ice Technologies: The fade, which can occur to disc brake rotor and pad when braking on a long downhill ride has a negative impact on the braking performance. Shimano has adopted Ice Technologies disc brake rotor and Ice Technologies pad to realise the cooling technology for consistent performance. The clad disc brake rotor blade, which has a 3 layer-sandwich structure of stainless steel, aluminium and stainless steel, provides better radiation performance achieving from 400˚C to 300˚C surface temperature. Also, the radiation fin has been adopted for the pad. Moreover, the clad disc brake rotor blade and the radiator fin provide long pad life, less noise, less fade and lightweight. One Way Bleeding: One Way Bleeding was developed for quick and easy prevention of air in our hydraulic system. We have streamlined the oil route throughout the system to prevent air bubbles from being captured in the system. One way oil routing plus a funnel tool with mineral oil provides an easy and clean bleeding system.Click HERE to check out the Shimano Brake Reference Guides.A 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 R8060 TT-Triathlon Brake LeverThis fantastic dual control lever is specifically designed for TT and triathlon use as it offers reduced drag thanks to its aerodynamic design. It features a rock-solid alloy construction which makes it more than capable of handling all the abuse that comes with a long day in the saddle. Coming equipped with some of the finest Shimano technologies around and its compatibility with Di2 groupsets makes this a perfect choice of upgrade for precise braking and smooth shifts. Features: Material: Alloy Use: Road, TT, Triathlon Speed: 11 speed Di2 Compatible: Yes Weight: 138g (pair)Technologies: SLR-EV: SLR-EV is SLR with a dual symmetric pivot brake caliper. The short-arm brake design employs two bearings and a roller to realize greater efficiency in the pivot area and deliver superior modulation and power for braking. Together with the BC-9000 brake cable, the latest calipers deliver 36% more braking power than SHIMANO's previous brake model. And we offer 2 axle symmetric brake caliper and fork mount and chain stay mount type (BR-R9100/6810/5810). Dual Control Lever: DCL stands for DUAL CONTROL LEVER. It has brake and shifting functions in the system and enables easy operation.Ergonomic innovation is probably more critical to the higher standard performance than the added gearing. The shift internals borrow the robustness from our MTB technology and are so smooth and effortless that one finger shifts front and rear are possible. Indeed, shifting is the ultimate act of SHIMANO TOTAL INTEGRATION, and simply has to be experienced to be understood. E-Tube: The E-TUBE platform's “Plug & play” and D-FLY wireless connections make it easier than ever to check the system's status, and apply customized settings to DI2 and SHIMANO STEPS components with a PC, tablet or smart phone. Wirelessly customize functions like SHIMANO SYNCHRONIZED SHIFT over Bluetooth while out on a ride. Automatically checks for firmware updates on each startup to ensure all components are running the latest version. PC, smartphone and tablet applications can help you quickly diagnose errors and simplify the repair process. Beautiful visualisation of your real-time SHIMANO STEPS riding data on your smartphone. Advanced all-weather design resists rusting, stretching, and freezing.A 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.
With Di2 technology shifting is easy and precise - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gear Full and semi synchronized shifting programable, Synchro shift compatible meaning a single shifter can control both front and rear shifting which can be fully custom tuned to your riding preferences. Semi synchronized shifting means when a front shift is made the rear mech will automatically correct to the appropriate ratio Simply pressing tactile buttons allows effortless and comfortable shifting even when your hands are cold Drop bar STI with shift buttons located in a near identical place to the positions you'd assume shifting using a mechanical Shimano STI Servo Wave brake lever pivot is positioned to be used with super SLR brake callipers, increase power providing excellent ergonomics when riding on the hoods Finely tuneable reach adjusters for the levers enable custom fitment for all hands Wired connection to the front and rear derailleurs with SD300 series wires Comes complete with SLR brake cable set
Featuring trickle down technology from Ultegra and the range topping Dura-Ace the new 105 R7020 STI shifters & Hydraulic Disc Calipers provide superbly crisp, precise and ultra-smooth shifting and powerful, consistent braking performance.Suitable for 2x11 Shimano drivetrainsPowerful hydraulic disc calipers provide excellent braking performance (Rotors & mounts sold separately)New chamfered hood tops for improved gripReliable Performance In All ConditionsWith the addition of powerful hydraulic disc brakes to the 105 range, Shimano finally has a more budget-orientated option to match the rest of the 105 range. The flat mount calipers house dual pistons that provide excellent stopping power in all conditions.Designed for 11-speed, double chainring systems, these shifters boast vastly improved ergonomics for more intuitive use, and newly chamfered tops to assist with grip in wet conditions. The lever features 15mm of reach adjustment so no matter your physiological requirements you will be able to tailor them to suit. The OPTISLICK cable technology features an electronically coated outer layer that assists with shifting efficiency and helps to weatherproof the shifters against corrosion. They also benefit from easier access to the inner cables, making these shifters eminently serviceable and a solid option for a year-round winter bike. The new ergonomic design features a new front-lever curve profile, which provides even faster and more comfortable shifting and brake engagement; it ensures performance is always at 100% and that every gear click and brake-pull feels natural and efficient. With effortless shifting performance, powerful braking and supremely comfortable ergonomics these shifters are the perfect upgrade for any rider.
Featuring trickle down technology from Ultegra and the range topping Dura-Ace the new 105 R7020 STI shifters & Hydraulic Disc Calipers provide superbly crisp, precise and ultra-smooth shifting and powerful, consistent braking performance.Suitable for 2x11 Shimano drivetrainsPowerful hydraulic disc calipers provide excellent braking performance (Rotors & mounts sold separately)New chamfered hood tops for improved gripReliable Performance In All ConditionsWith the addition of powerful hydraulic disc brakes to the 105 range, Shimano finally has a more budget-orientated option to match the rest of the 105 range. The flat mount calipers house dual pistons that provide excellent stopping power in all conditions.Designed for 11-speed, double chainring systems, these shifters boast vastly improved ergonomics for more intuitive use, and newly chamfered tops to assist with grip in wet conditions. The lever features 15mm of reach adjustment so no matter your physiological requirements you will be able to tailor them to suit. The OPTISLICK cable technology features an electronically coated outer layer that assists with shifting efficiency and helps to weatherproof the shifters against corrosion. They also benefit from easier access to the inner cables, making these shifters eminently serviceable and a solid option for a year-round winter bike. The new ergonomic design features a new front-lever curve profile, which provides even faster and more comfortable shifting and brake engagement; it ensures performance is always at 100% and that every gear click and brake-pull feels natural and efficient. With effortless shifting performance, powerful braking and supremely comfortable ergonomics these shifters are the perfect upgrade for any rider.
With a wide 22mm rim profile that's optimized for high-volume tires this UST Road Tubeless wheel system is built for adventure.Perfect for riding on rough roads gravel or dirt it gives you the smooth-riding performance of tubeless tires and makes it easy to set them up without any hassles. Low rolling resistance and a reduced risk of punctures add up to a better overall riding experience especially on rugged terrain.The wheels are engineered for the unique demands of disc brakes built up with 24 straight-pull spokes which are stronger than J-bend spokes. So wherever the road goes and however rough it gets you're ready to keep things rolling. Key benefits Purpose-built for riding rough roads gravel or dirt. 22mm wide rim takes tire up to 62mm. UST Road Tubeless technology improves comfort and rolling resistance and reduces the risk of punctures. Compatible with all standard retention systems. Proven performance and reliability at an attainable cost. High-quality QRM cartridge bearings. Disc-brake-specific sleeved-style rim technology. Straight-pull round spokes which are stronger than J-bend spokes. Rolling efficiency and a nimble ride quality. Sleeve joint rim minimizes weight. Consistent and stable spoke lacing. Low-friction hubs. Rims Tire: UST Tubeless and tubetype Material: S6000 Aluminum Valve hole diameter: 65 mm Disc brake specific profile Joint: sleeved Internal width: 23 mm Height: 22 mm ETRTO size: 622x23TC Spokes Shape: straight pull round Count: 24 front and rear Lacing: front and rear crossed 2 Material: steel Nipples: steel ABS Delivered with User guide UST valve and accessories Front QR adapters Pre-installed tubeless rim tape Rear QR adapters for Instant Drive 360 Intended use Recommended tire sizes: 28 to 64 mm (11 to 25) ASTM CATEGORY 2 : road and offroad with jumps less than 15cm For a longer longevity of the wheel Mavic recommends that the total weight supported by the wheels doesn't exceed 120kg bike included Max Pressure: see indication on wheel and tire If they differ use the lowest of the 2 Minimum and maximum allowed tyre width: see indication on wheel Maximum tyre pressure: 55bar/80PSI with a 28mm tyre - 325bar/47PSI with a 64mm tyre Hubs Axle material: aluminum Front and rear bodies: aluminum Instant Drive 360 freewheel technology Rear: Quick Release 12x142 and 12x135 compatible Front: Quick release 12x100 and 15x100 through axle compatible QRM Auto bearing preload technology Compatibility Freewheel: Shimano/Sram convertible to Campagnolo ED11 N3W and XD-R with optional driver bodies Front axle: 12mm thru axle easily convertible to quick release with optional adapters Convertible to 15mm with complete axle replacement Versions Color: Black only Disc standard : 6 Bolts or Center Lock® Compatible Adapters and freewheel bodies 12 to 9mm front adapter for quick release (V2680301) 15mm axle (V2373501) 12x142 rear axle adapters (V2510701 - Delivered with the wheel) 12 to 9mm rear adapter for quick release (V2510801 - Delivered with the wheel) ID360 Shimano / Sram Light freewheel body (V3850101) ID360 Campagnolo freewheel body (V3440101) ID360 XD-R freewheel body (V2580101) ID360 Shimano / Sram freewheel body (V3430101) 12x135 rear axle adapters (V2510901) ID360 N3W freewheel body (V4270101) Information on specified weight The weight of the wheels is announced at +/-5% in XD/XD-R and Center Lock version without quick release nor valve nor rim tape
The name Crossmax has a long history in the world of XC riding and racing and the new Crossmax SL lives up to that legacy. It offers many of our proven Mavic technologies at an attainable price. Weighing just 1700g it’s a true all-rounder and the best alloy XC wheel in its category.The rims are made with our patented Fore technology featuring a fully sealed upper rim bridge that eliminates the need for rim tape. That saves 30 grams per wheel not to mention the hassle of using tape to set up tubeless tires. The rim has a 25mm internal width with a durable hookless profile and our Black Shield technology gives them a distinctive modern look that protects against scratches and abrasions.We use 24 straight-pull spokes (same spoke length throughout) for a strong connection between the rim and hub and a perfect balance between efficiency and durability. Special machining on the hub ensures that the spoke head is secured but can still travel in the slot. This allows the wheel to absorb impacts from trail obstacles. Our Instant Drive 360 freewheel coupled with QRM Auto bearing technology provides fast engagement and added durability. The Crossmax SL 29 is compatible with Shimano HG9 Micro Spline and SRAM XD driver bodies. It’s available with 6-bolt or center lock brake rotors in 29” only and is compatible with a 15x110 front axle and 12x148 rear. It comes with valves replacement spokes and accessories. Key benefits Faster accelerating and climbing capabilities Fore technology sealed rim design minimizes weight and increases strength. Eliminating rim tape saves 30g per rim. Ultra-reliable ID360 freewheel system for instant engagement. Increased traction and durability 25mm wide hookless rim profile optimized for lower tire pressures resulting in improved grip in all conditions. Optimized for modern XC tubeless tires from 2.1 to 2.30'. Black Shield treatment protects rims against impacts and scratches. Most user-friendly tubeless system Fore technology fully sealed rim with no rim tape makes it easy to mount and change tubeless tires. Leaving the upper rim bridge intact boosts the stiffness and durability of the rim. Rims Material: Maxtal Tire: UST Tubeless and tubetype Material: S6000 Aluminum SUP welding technology Fore tapeless tubeless technology ETRTO size 29: 622x25TSS Internal width: 25 mm Hookless profile Black Shield treatment (protects your rim against impacts and scratches) Asymmetrical rim design Spokes Count: 24 front and rear Nipples: Fore integrated aluminum Material: steel Shape: straight pull flat double butted Lacing: front and rear crossed 2 contactless Delivered with UST valve and accessories Multifonction adjustment wrench (delivered with rear wheel) 2 replacement spokes with each wheel Hubs Instant Drive 360 freewheel technology Hub available for 6-bolt or Center Lock® brake rotors Axles: Front 15X110 Boost ; Rear 12X148 Boost Infinity hubs Intended use Recommended tire sizes: 52mm to 76mm (20 to 30) ASTM CATEGORY 3 : CROSS COUNTRY For a longer longevity of the wheel Mavic recommends that the total weight supported by the wheels doesn't exceed 150kg bike included Minimum and maximum allowed tyre width: see indication on wheel Maximum tyre pressure: 41bar/59PSI with a 28mm tyre - 245bar/36PSI with a 64mm tyre Versions Disc standard : 6 Bolts or Center Lock® Hub width : Boost only (front 110 rear 148) Freewheel: SRAM XD Shimano HG9 Shimano Micro-Spline Compatible Adapters and freewheel bodies ID360 Shimano HG9 alloy freewheel body (V3780101) ID360 Sram XD freewheel body (V3740101) 15mm front hub cap (V2372501 - Delivered with the wheel) Boost : Torque Caps for Center Lock hub (V2374401) ID360 Shimano Micro Spline alloy freewheel body (V3990101) Compatibility Freewheel: Shimano HG9 XD or Micro Spline Rear axle: 12x148 Boost thru axle Front axle: 15x110 Boost thru axle Information on specified weight The weight of the wheels is announced at +/-5% in XD/XD-R and Center Lock version without quick release nor valve nor rim tape
The uninterrupted shifting experience of the Dura-Ace R9200 12-speed cassette range lets you climb, sprint, and push your limits without stopping to think about your next gear change. Larger driving cogs maximize drivetrain efficiency and create compatibility with both Shimano 11 and 12-speed freehub bodies. HYPERGLIDE+ cassettes have revolutionized off-road shifting with their seamless shifts both up and down the gear range. Now it's time for the technology to change road cycling. Even during maximal efforts up a climb or nearing the finish line, riders no longer need to back off to perform a shift. In any gear, Dura-Ace R9250 drivetrains maximize efficiency thanks to larger cogs and retain compatibility with existing 11-speed freehub bodies. All this while increasing to 12-gears and without increasing weight, Dura-Ace CS-R9200 cassettes are the new paradigm in road shifting. Faster, seamless shifts under maximum pedaling load Refined 12 step gear combination provides peak efficiency and accelerating performance for every situation Add wider 34T spec for pro-race usage Compatible with new 12-speed and road 11-speed Freehub body
Ultegra Shadow design with Di2 technology, shifting is easy and precise - just a light touch, as soft as a mouse click, is sufficient for the front or rear derailleur to instantaneously select the correct gearSleek appearance with Low profile Shadow design construction reduces risk of damage in a crash,Programmed automatic motion at the touch of a switch makes this derailleur quick, smooth and effortless to shift,The removal of traditional mechanical cables in favour of electrical wires not only eliminates poor shifting caused by contaminates, corrosion and stretching, but provides effortless gear shifts,Derailleur contains a saver (fuse) function, where the inner structure is protected from strong impacts,High tolerance cold forged aluminium link plates and body construction is extremely light and durable,Four self-lubricating micro-machined fluorine-coated link pivot bushings provide low-friction shifting,11-speed E-tube Di2 compatible,Wide gear ratio compatible with 11-28 up to 11-34T.
Fulcrum Racing 5 C17 Road WheelsetThis Road Wheelset from Fulcrum offers exceptional performance and efficiency thanks to its high-quality construction. Engineered to be driven hard, this wheelset is ideal for race days on the road. Fast-rolling and Efficient WheelsetCapable of effective and easy power-transfer, this roadie wheelset gives high lateral stiffness, generated by its straight-pull stainless steel spoke system and aluminium construction. Such levels of stiffness improve rolling and responsiveness to provide the performance that's demanded by modern road riders. Features:Material: Rims and Hubs: Aluminium; Spokes: Stainless SteelRim Height: Front: 24.5mm; Rear: 27.5mmRim Width: Internal: 17mm; External: 23mmRim Type: Clincher, rim brakeUse: Road Race, Training, EnduranceSpoke Type: Aero Straight-pullSpoke Count: Front: 18; Rear: 20Freehub: 9, 10, 11 speedWeight: 1.65kgTechnologies:Anti-Rotation System: This system locks the spoke in place once the correct tension is achieved. Engineers at Fulcrum have designed this system to ensure the spokes never lose their initial tension and to remain in the position that has been proven to provide the perfect aerodynamic properties.Rim Dynamic Balance: Simple and Elegant, the weight of the rim gasket is balanced on the opposite side with an item of similar weight.Buy Fulcrum Wheels & Tyres from Chain Reaction Cycles, the World's Largest Online Bike Store.