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Shimano Ultegra R8170 C60 Carbon CL Rear Disc Wheel Back Wheels
  • £329.99
  • RRP £679.99
  • Saving you £51

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 Mount The 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 Profile Aerodynamic 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 System The 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.

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Shimano Ultegra R8150 Di2 12 Speed Rear Derailleur Rear Derailleurs
  • £329.99
  • RRP £379.99
  • Saving you £13

Now simplified with a single derailleur cage length, the new 12-Speed Shimano Ultegra R8150 rear derailleur packs the fastest, most precise shifting on the market into a more affordable option. With the fastest, most accurate shifting on the market, the new 12-Speed Ultegra R8150 rear derailleur is more versatile than ever thanks to a single cage length option compatible with 11-28, 11-30, and 11-34 cassettes. Shimano Di2 Electronic Drivetrain Performance Thanks to its lightning-fast, accurate, and reliable shifting performance, Di2 puts riders in complete control and ensures a seamless interface between the cyclist and bike like never before. Creating and continually improving the world's best shifting is a complicated undertaking requiring constant technological advancements. From hardware to software, Shimano Di2 technology is on the cutting edge, striving to deliver the best rider experience possible now and in the future. Shimano E-Tube Compatible E-Tube is Shimano's “service” that uses websites or apps to maximize the enjoyment of riding a bicycle by connecting the riders, the bicycles and Shimano. Shimano's genuine application E-Tube Project for Mobile allows you to customize your bike, update firmware, and maintain it by connecting it wirelessly to your bike. You can also get more detailed bike maintenance by connecting to your bike by wire with E-Tube Project via the Windows V4 application. Direct Mount Compatible Rear wheels are easier to remove with a mounting option for SHIMANO SHADOW RD and SHIMANO SHADOW RD+. The direct mount feature is designed to suit a wide range of contemporary frames with large-section chainstays, in particular, mountain bikes with thru-axle dropouts. Shimano Shadow Low-Profile Rear Derailleur The mechanism rear derailleur, Shimano Shadow RD, is intended for more aggressive riding. Its super low profile design carries many benefits. Because of its low profile and single tension construction, the derailleur does not hit the chain stay in rough riding conditions. The result is smooth and silent performance.

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Shimano Ultegra R8170 C60 Carbon CL Disc Wheel - Black - Rear}, Black
  • £329.99
  • RRP £679.99
  • Saving you £51

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.

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Shimano Ultegra ST-R8070 Di2 11 Sp Road Brakes 2018 - Black - Left Rear}, Black
  • £329.99

Shimano Ultegra ST-R8070 Di2 11 Sp Road BrakesThis 11 speed brake lever features a dual control design, which allows you to control both your braking and your shifting operation. It features an updated button feel and a layout which ensures quick and precise shifting, even when wearing thick gloves. Shimano has also equipped this model with a tooled adjustable reach, so you can fine-tune the distance between the lever and your handle to perfectly match your hand size, riding style and the terrain conditions. One final highlight is its programmable ST button switch at the top of the hood, which makes shifting quick and easy.- 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 visualization of your real-time SHIMANO STEPS riding data on your smartphone.- Advanced all-weather design resists rusting, stretching, and freezing.Features: Use: Road Lever Type: Dual Control Lever Oil: Shimano Mineral Oil Recommended Brake Caliper: BR-R8070 Recommended Brake Hose Kit: SM-BH90-JK-SSR Clamp Band Inner Diameter: 23.8 - 24.2 Cables/Hose Included: No Single or Pair: Single Tooled Reach Adjust: Yes Part Numbers: Left: R8070DRF; Right: R8070DLR Weight: 180gTechnologies: Reach Adjust: 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. Dual Control Lever (DCL): 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. The DURA-ACE/ULTEGRA/105 Dual Control Lever have an optimized structure with features that include the lighter weight pivot section in the near side of the shifting unit and the integral shifting cable for lighter steering. Its many component parts are made so compact and precise to achieve unprecedented high-speed performance. Freestroke: The distance from initial lever position to pad contact point can be adjusted to suit any hand size, type of riding and individual rider preferences. 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.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.

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Shimano Ultegra R8150 Di2 12 Sp Rear Derailleur - Black - Shadow}, Black
  • £329.99
  • RRP £379.99
  • Saving you £13

Shimano Ultegra R8150 Di2 12 Sp Rear DerailleurEngineered to offer rapid and precise gear shifting, the Ultegra R8150 Di2 12 Speed Rear Derailleur from Shimano is the most efficient and reliable 12-Speed derailleur available. It's compatible with Shimano Di2 electronic drivetrain systems, which enables you to click through the 12-Speed gear range with minimal effort and the utmost accuracy.Now simplified with a single derailleur cage length, the new 12-Speed Shimano Ultegra R8150 rear derailleur packs the fastest, most precise shifting on the market into a more affordable option. With the fastest, most accurate shifting on the market, the new 12-Speed Ultegra R8150 rear derailleur is more versatile than ever thanks to a single cage length option compatible with 11-28, 11-30, and 11-34 cassettes. Shimano Di2 Electronic Drivetrain PerformanceThanks to its lightning-fast, accurate, and reliable shifting performance, Di2 puts riders in complete control and ensures a seamless interface between the cyclist and bike like never before. Creating and continually improving the world's best shifting is a complicated undertaking requiring constant technological advancements. From hardware to software, Shimano Di2 technology is on the cutting edge, striving to deliver the best rider experience possible now and in the future. Shimano E-Tube CompatibleE-Tube is Shimano's “service” that uses websites or apps to maximize the enjoyment of riding a bicycle by connecting the riders, the bicycles and Shimano. Shimano's genuine application E-Tube Project for Mobile allows you to customize your bike, update firmware, and maintain it by connecting it wirelessly to your bike. You can also get more detailed bike maintenance by connecting to your bike by wire with E-Tube Project via the Windows V4 application. Direct Mount CompatibleRear wheels are easier to remove with a mounting option for Shimano Shadow RD and Shimano Shadow RD+. The direct mount feature is designed to suit a wide range of contemporary frames with large-section chainstays, in particular, mountain bikes with thru-axle dropouts. Shimano Shadow Low-Profile Rear DerailleurThe mechanism rear derailleur, Shimano Shadow RD, is intended for more aggressive riding. Its super low profile design carries many benefits. Because of its low profile and single tension construction, the derailleur does not hit the chain stay in rough riding conditions. The result is smooth and silent performance. Features: Fastest ever rear shifting, 58% faster than RD-R9150 Compact design includes an integrated wireless unit, charger, and switch LED status indicator Battery indicator Pairing Adjust mode, etc. Wider range capacity Max. Low Sprocket: 34T Speeds: 12-Speed Weight: 262gA 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.

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Shimano Ultegra R8025 2x11 Speed Short Reach Disc Brake Disc Brake Callipers
  • £334.99

Featuring a smaller lever size and new positioning, the Ultegra R8025's lever improves the overall braking and shifting experience for riders with smaller hands. With a redesigned internal shifting unit, you'll benefit from its quick and intuitive gear changes and operation. Enjoy greater control in all conditions with some of the best technologies at your fingertips helping you wherever the road takes you. Behind the "click" you hear and feel every time you shift, is its Shimano Index Shifting System technology providing you with light, precise and consistent gear changes. Completing this set is a powerful flat mount caliper which gives you constant stable braking without any power loss. Its oversized pistons use Ice Tech technology to achieve an optimised low weight, high rigidity and excellent heat dissipation. Furthermore, this technology transfers hydraulic power directly to the brake pad and ceramic material is used to avoid heat transfer. As a result, you'll benefit from longer lasting stopping performance and modulation, making it an ideal upgrade for going further than before ride after ride. Click here to view the Shimano Brake Reference Guide.

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Shimano Ultegra ST-R0825 Short Reach Hydraulic 11 Speed STI Levers
  • £334.99

New ULTEGRA R8000 series is "pro-proven" as it is a direct trickle down from DURA-ACE groupset. As road bike component, the stress-free operation is one of the most important feature to lead all day riding comfort with braking and shifting.Available with or without Brake Caliper and MountKey Features:Smaller lever size and new positioning improves ergonomics,Dedicated lever control for riders with smaller hands,Redesigned internal shifting unit,Greater control in all conditions for riders with smaller hands,Quick and intuitive rear shifting operation,Same light shifting operation as ULTEGRA R8000.

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Stages Cycling G3 Ultegra R8000 Power Meter Power Meter Cranksets
  • £338.00
  • RRP £374.99
  • Saving you £10

Building on what it learned with its Gen 2 Version, Stages has developed its technology even further for this latest Gen 3 model. Installed onto a Shimano Ultegra R8000 non-drive side crank arm, it is individually calibrated to ensure its accuracy. Stages produce power meters that both avid amateurs and professionals at the top of their game can trust. Reliable Readings In All Conditions To ensure consistency of measurement on the Stages G3 Ultegra R8000, Stages Cycling introduced a World-first feature to its power meters. This feature is called “Active temperature Compensation” and it is built in as standard to account for sudden temperature changes, which if not accounted for, would result in false and inaccurate data. Stable Connection Stages have made additional improvements to the Bluetooth and ANT+ transmitters and the accelerometer. This ensures the Stages Cycling Power Meter G3 l Ultegra R8000 provides a stable and powerful connection with your cycle computer is maintained and a faster sampling rate for more up-to-date feedback on your performance. Compatibility: · Compatible with all Shimano Hollowtech II road drivetrains · Frame Compatibility: Most frames · Device Compatibility: ANT+, Bluetooth Smart ready  · Software Compatibility: StagesLink, Training Peaks, Strava, Garmin Training Centre and other  In The Box: · Power meter · High-quality CR2032 coin cell battery · Product identification card with serial number and ANT+ I.D. · Number user guide

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Stages Cycling Ultegra R8000 G3 Power Meter - Black, Black
  • £338.00
  • RRP £374.99
  • Saving you £10

Stages Cycling Power Meter G3 L Ultegra R8000This Power Meter from Stages has been a proven performing time and time again. Used by three TDF winners, it helps ensure you outperform thanks to its accurate readings within +/- 1.5% and is compatible with any Shimano road drivetrain. Increased AccuracyStages have built on what it learned when producing its Gen 2 model, by developing the technology even further for increased accuracy of the readings. This Gen 3 model is assembled within an Ultegra R8000 non-drive side crank arm and is individually calibrated. This ensures it provides an accuracy that can be trusted by avid amateurs and professionals on the World Tour.Reliable Readings In Any WeatherTo ensure the measurements remain consistent in any weather type, Stages introduced a feature that’s never been seen integrated into a power meter before. The feature is “Active Temperature Compensation” and Stages added this technology to account for any sudden temperature changes that you might encounter on your ride. If temperature changes are not accounted for, it can result in false and inaccurate data.Strong ConnectionOther improvements include more powerful Bluetooth and ANT+ transmitters. These improvements ensure the power meter provides a powerful and stable connection with your cycle computer is maintained. Also, thanks to the addition of a more advanced accelerometer, the power meter has a faster sampling rate for more up-to-date feedback on your performance.In The Box:    Power MeterHigh-quality CR2032 coin cell batteryLifetime access to Stages Link for power meter management and firmware upgrades.2 months of free access to Stages Link premium training and coaching features.Product Identification Card with Serial Number and ANT+ I.D. Number.User GuideFeatures: Accelerometer-based cadence measurement    Wirelessly upgradable firmware    LED indicator displays battery level    Updated accelerometer and addition of gyroscope    Upgraded BLE and ANT+ radios offer a 6X improvement of data transmission strength    Battery Life: 200+ hours (coin cell: CR2032) when used as a single-sided meter    Power Range (Watts): 0 to 5000    Cadence range (rpm): 10-220    Water Resistance Rating: IPX7 Weight: Only adds 15g to the base crank armCompatibility:    Compatible with all Shimano Hollowtech II road drivetrains    Frame Compatibility: Most frames    Device Compatibility: ANT+, Bluetooth Smart ready     Software Compatibility: StagesLink, Training Peaks, Strava, Garmin Training Centre and othersBuy Stages Cycling Components from Chain Reaction Cycles, the World's Largest Online Bike Store.

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Shimano Ultegra R8170 C50 Carbon CL Disc Wheel Wheel Sets
  • £339.99
  • RRP £679.99
  • Saving you £50

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 Mount The 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 Profile Aerodynamic 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 System The 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 System The 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.

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Shimano Ultegra R8170 Di2 12 Speed Disc Shifter Brake Levers
  • £339.99
  • RRP £349.99
  • Saving you £3

Road riding has never been this much fun. That's because the redesigned Ultegra ST-R8170 Dual Control Levers have all-new ergonomics, even more precise brake modulation, and wireless electronic shifting. This trifecta lets you focus on the next sprint, the next descent, or the next joke from your riding partner. Shimano's new Ultegra ST-R8170 brake levers bring enhanced modulation and control to every ride by employing Shimano's proven SERVO WAVE technology. The all-new Di2 platform, used on both Dura-Ace and Ultegra, untethers the shifters while delivering the world's fastest, most reliable wireless shifting. Your time on the bike is precious, let Shimano make it even better. Servo Wave Precise Braking Control When you pull a Servo Wave brake lever, initial pad travel is fast, so little lever movement is needed to bring the pads into contact with the rotor. The power multiplication factor then increases rapidly at the pad-to-rim contact so more of the lever stroke is used to apply greater braking power with improved control. Shimano DCL 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 as critical to higher standard performance as the added gearing. The shift internals borrows the robustness from Shimano's MTB technology and is 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. Please Note: this model is for the Shimano Ultegra R8170 Di2 12 Speed Disc Shifter only - the hydraulic brake caliper is sold separately.

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Shimano Ultegra R8170 C50 Carbon CL Disc Wheel - Black - Rear}, Black
  • £339.99
  • RRP £679.99
  • Saving you £50

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.

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