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Inventory may vary and items may be only available at one of our stores. Please call us to make sure the part you are looking for is available at the store you want to visit.

Belmont Wheelworks - 617.489.3577 | ACE Wheelworks - 617.776.2100

Campagnolo Record EPS V2 Interface Unit
$180.00
Campagnolo's Record EPS V2 Interface Unit is like a translator, the vital piece of the electronic shifting puzzle. Mounted to the brake cable or the handlebar, it processes the data churned out by the EPS Power Unit (sold separately) and communicates it to you via an easy-to-read colored LED. Plus, it plays the critical role of converting every analog shift you send its way into a digital format so the system can work as a cohesive whole. There's also an easy-to-read LED battery gauge so you know when it's time to recharge the system. And don't mind the weather, as it's totally waterproof.
Profile Design Sonic Ergo 35a
$159.99
Our new Sonic bracket has been designed as the successor to the J2, which has been a somewhat ignored part of our range. With this update it brings our new generation fit range to a wider range of price points, replacing the J2 bracket. The Ergo armrest has been created to offer both a huge upgrade in fit range as well as increased rider comfort with a supportive curve to cup the arms. Performance - The Sonic/Ergo is designed to present minimal frontal area to create as little aerodynamic drag as possible. The main purpose of an aerobar is, of course, to get the rider into a fast position. Despite a fairly minimalist appearance, the Sonic/Ergo offers a comprehensive fit range for exactly this purpose. Fit Data - Armrest Offset: -70mm to -2.5mm in 7.5mm steps - Armrest Width: 124mm to 290mm in 18.5mm steps (With Extensions at 100mm) - Armrest Stack: 60mm (no riser kit) to 130mm in 5mm increments (With aftermarket Riser Kit) - The extension length and rotation can be easily adjusted using the top bolt. There are 100 distinct position options achievable just by moving the armrests. Combine that with the risers and this bar offers 1500 possible configurations. As a clip-on bar it is also possible to adjust the extension width and tilt easily. This is the most adjustable clip-on bar on the market (and in history). It is worth noting that our previous top level clip-on aerobar, the J4/F35, offered 90 possible configurations. This highlights the significant step forward we’ve made with our new generation aerobars in allowing riders to precisely adjust their position. Origin - After we released the Supersonic (J5) as a premium bracket with market-leading fit options and versatility, we wanted to bring the same kind of options to the rest of our range of brackets and thus aerobars. By simplifying the extension clamp and shifting the wing forward to the bar center line, we were able to meet our targets. As a consequence of the simplification the Sonic is the lightest of our current brackets. The Ergo armrest shares the flippable design of the rest of our new generation armrests. By swapping sides or rotating the armrests, smaller increments of movement are achieved – making it simple to fine-tune a rider's position or match the position from their previous aerobar or bike. Extensions - Extension Shape: A 35 degree ski-bend extension suited to riders who prefer to adopt a wrist angle that is on the low side of the neutral range. - The 35a is a straight 35° bend. - Bracket: Sonic - Clamp Diameter: 31.8mm (26.0 w/Shims) - Armrest: Ergo / 10mm Pads - Armrest Width: 124mm to 290mm in 18.5mm steps (with Extensions at 100mm) - Armrest Offset: -70mm to -2.5mm in 7.5mm steps - Armrest Stack: The minimum is 60mm and the bracket is compatible with our existing risers which add up to 130mm stack with (70mm of spacers added) - Weight: 559g
Profile Design Sonic Ergo 4525a
$159.99
Our new Sonic bracket has been designed as the successor to the J2, which has been a somewhat ignored part of our range. With this update, it brings our new generation fit range to a wider range of price points, replacing the J2 bracket. The Ergo armrest has been created to offer both a huge upgrade in fit range as well as increased rider comfort with a supportive curve to cup the arms. Performance - The Sonic/Ergo is designed to present minimal frontal area to create as little aerodynamic drag as possible. The main purpose of an aerobar is, of course, to get the rider into a fast position. Despite a fairly minimalist appearance, the Sonic/Ergo offers a comprehensive fit range for exactly this purpose. Fit Data - The extension length and rotation can be easily adjusted using the top bolt. There are 100 distinct position options achievable just by moving the armrests. Combine that with the risers and this bar offers 1500 possible configurations. As a clip-on bar it is also possible to adjust the extension width and tilt easily. This is the most adjustable clip-on bar on the market (and in history). It is worth noting that our previous top level clip-on aerobar, the J4/F35, offered 90 possible configurations. This highlights the significant step forward we’ve made with our new generation aerobars in allowing riders to precisely adjust their position. Origin - After we released the Supersonic (J5) as a premium bracket with market-leading fit options and versatility, we wanted to bring the same kind of options to the rest of our range of brackets and thus aerobars. By simplifying the extension clamp and shifting the wing forward to the bar center line, we were able to meet our targets. As a consequence of the simplification the Sonic is the lightest of our current brackets. The Ergo armrest shares the flippable design of the rest of our new generation armrests. By swapping sides or rotating the armrests smaller increments of movement are achieved – making it simple to fine tune a riders position or match the position from their previous aerobar or bike. - Bracket: Sonic - Clamp Diameter: 31.8mm (26.0 w/Shims) - Armrest: Ergo / 10mm Pads - Armrest Width: 124mm to 290mm in 18.5mm steps (with Extensions at 100mm) - Armrest Offset: -70mm to -2.5mm in 7.5mm steps - Armrest Stack: The minimum is 60mm and the bracket is compatible with our existing risers which add up to 130mm stack with (70mm of spacers added) - Weight: 559g
Profile Design Sonic Ergo 50a
$159.99
Our new Sonic bracket has been designed as the successor to the J2, which has been a somewhat ignored part of our range. With this update, it brings our new generation fit range to a wider range of price points, replacing the J2 bracket. The Ergo armrest has been created to offer both a huge upgrade in fit range as well as increased rider comfort with a supportive curve to cup the arms. Performance - The Sonic/Ergo is designed to present minimal frontal area to create as little aerodynamic drag as possible. The main purpose of an aerobar is, of course, to get the rider into a fast position. Despite a fairly minimalist appearance, the Sonic/Ergo offers a comprehensive fit range for exactly this purpose. Fit Data - Armrest Offset: -70mm to -2.5mm in 7.5mm steps - Armrest Width: 124mm to 290mm in 18.5mm steps (With Extensions at 100mm) - Armrest Stack: 60mm (no riser kit) to 130mm in 5mm increments (With aftermarket Riser Kit) - The extension length and rotation can be easily adjusted using the top bolt. There are 100 distinct position options achievable just by moving the armrests. Combine that with the risers and this bar offers 1500 possible configurations. As a clip-on bar it is also possible to adjust the extension width and tilt easily. This is the most adjustable clip-on bar on the market (and in history). It is worth noting that our previous top-level clip-on aerobar, the J4/F35, offered 90 possible configurations. This highlights the significant step forward we’ve made with our new generation aerobars in allowing riders to precisely adjust their position. Origin - After we released the Supersonic (J5) as a premium bracket with market-leading fit options and versatility we wanted to bring the same kind of options to the rest of our range of brackets and thus aerobars. By simplifying the extension clamp and shifting the wing forward to the bar center line we were able to meet our targets. As a consequence of the simplification the Sonic is the lightest of our current brackets. - The Ergo armrest shares the flippable design of the rest of our new generation armrests. By swapping sides or rotating the armrests smaller increments of movement are achieved – making it simple to fine-tune a riders position or match the position from their previous aerobar or bike. Extensions - Extension Shape: A 50a extensions offer a 50° ski bend shape. The 50a offer a 7.5mm lateral shift per side. This allows the rider to get their hands narrower or wider without tilting the extensions so much that the shifters touch. - Bracket: Sonic - Clamp Diameter: 31.8mm (26.0 w/Shims) - Armrest: Ergo / 10mm Pads - Armrest Width: 124mm to 290mm in 18.5mm steps (with Extensions at 100mm) - Armrest Offset: -70mm to -2.5mm in 7.5mm steps - Armrest Stack: The minimum is 60mm and the bracket is compatible with our existing risers which add up to 130mm stack with (70mm of spacers added) - Weight: 559g
Shimano Di2 Battery Charger
$97.99 - $133.99
Shimano's Di2 electric drivetrain takes shifting to the next level. Two Di2 Battery Chargers are available. Choose the model designed for your system's battery. An additional power cable is required for the external-style battery charger (sold separately). These chargers fully charge the battery in 90 minutes.
RockShox Reverb Remote Lever Assembly A2/B1
$133.08
RockShox Reverb Remote Assembly for A2 and B1 generation Reverb dropper seatposts. - Includes remote Lever, MMX clamp, Discrete Puck, 1500mm of new hose, new hose barb, and new hose strain relief - Works with A2 and B1 generation posts - A2 posts have a black return speed adjuster on the remote and no laser-etched logos on stanchion by the saddle cradle. - B1 posts have a black return speed adjuster on the remote and "ROCKSHOX" laser-etched logos on stanchion by the saddle cradle.
Zipp Vuka Aero Bar Extensions
$131.99
Zipp’s Vuka Extensions are made of ultralight, stiff carbon and come in different bends so that you can find the model that optimizes your aero position and maximizes your speed. The Straight extensions place you as low as possible, while the Race and Ski-Tip models have more bend for your wrists. Then, for a seamless junction between your shifters and the extensions, the Race Vuka Shift has built-in mounts that let you screw your shifters directly to the extensions. They accept Zipp’s R2C Aero shifters and SRAM's 900 TT and 500 TT shifters. All the extensions have internal cable routing and gradations to make adjustments easy.
Shimano BMDN100 Di2 Long Battery Mount for External Wiring
$124.99
Shimano Di2 External Battery Mounts - All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions - Use Di2 system checker to update component firmware
Shimano Short Battery Mount External/Internal Wiring
$118.99
Shimano Di2 External Battery Mount - All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions - Use Di2 system checker to update component firmware
RockShox Remote Upgrade Kit for Reverb
$98.00
This 1X-style remote for installation on the left side provides improved dropper actuation for your Reverb seatpost. Includes: - Remote - Bleeding edge fitting - Discrete clamp - MMX clamp
Problem Solvers Cable Doubler
$59.99 - $89.99
The Problem Solvers Cable Doublers are made of light, durable machined and anodized aluminum and they are Teflon coated for a super-smooth cable pull every time. They come in two models. The first allows you to control two brakes with one lever. The second allows you to control one brake with two levers. Why? Well, there are myriad applications: tandems, cyclocross bikes, fixies, tricycles, recumbents, cycles for those with special needs, bike polo bicycles, those 4-person bikes you see on beach boulevards, and so on. You could even link both models of Cable Doublers together for the ultimate in redundancy!
RockShox Reverb Stealth B1 400-Hour or 2-Year Service Kit
$79.00
This kit contains all the parts needed for scheduled maintenance and/or rebuild of B1 Stealth Reverb Seatposts. - Includes Blue 1-Piece U-Cup Seal Internal Floating Piston (IFP) - Rebuilds IFP, Poppet, Seal Head, Dust Seal, Piston, Brass Keys, and Bushing - Requires RockShox Specialty Tools to perform Service: Post Bleed Tool, Oil Height Tool, IFP Height Tool - B1 posts have a black return speed adjuster on the remote and "ROCKSHOX" laser-etched logos on stanchion by the saddle cradle
Shimano BT-R1A External Di2 Battery
$77.99
Shimano BT-R1A External Di2 Battery - All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions - Use Di2 system checker to update component firmware - Di2 External Battery, battery charger, and power cable are universal between Dura-Ace 9070, 7970, Ultegra 6870, 6770 and Alfine Di2 systems - Battery weight: 71 grams
Blackspire Defender Bash Guard
$74.99
- The only bash guards offering protection for 2x and 1x drivetrains with odd BCDs - Anodized with laser etched graphics, CNC machined 6061 T-6 aluminum construction and includes custom mounting hardware - 120BCD: XX/XO/X9/X7 2x cranks - 88BCD: XTR M985 2
RockShox Maxle Ultimate Rear Thru-Axle
$70.00
The tool-free Maxle Ultimate Rear brings exceptional stiffness and durability to your ride in a high clamping force, easiest-to-use internal cam thru axle system.
Stages Cycling Replacement 30mm Spindles
$70.00
The spindles are manufactured for Stages Cycling by Full Speed Ahead, forged and machined out of aluminum to allow for the carbon Stages Power meter for FSA 386 EVO and Stages Carbon 30mm model to be used with many SRAM BB30 road and SRAM BB30 mountain bike drive side cranks, as well as SRAM DUB MTB, Race Face Next SL and Specialized S-Works Road. The Stages Power meter 30mm spindles are specifically designed to meet or exceed the performance of the manufacturer's stock component, while allowing the retro fit of the new carbon Stages Power Meter to a rider's SRAM and Race Face drivetrain. Stages Cycling BB spindles are available in six options: A) SRAM Red 22 BB30 B) SRAM Force 22, Rival 22, Force/Rival CX1 C) 2015MY SRAM BB30 mountain cranks - 9mm spacer* D) 2015MY SRAM BB30 mountain cranks - 15.5mm spacer* E) Race Face Next SL - 168mm q factor F) Specialized S-Works Road - 2017/2018MY G) SRAM DUB MTB * Not compatible with 156mm Q-factor
Wolf Tooth Components ReMote Dropper Post Lever
$70.00
The Wolf Tooth ReMote is a significant lever upgrade for cable-actuated dropper seatposts. From its hassle-free installation to smooth ball bearing action to engineered failure point, the lightweight ReMote solves many of the functional problems that come with other dropper lever designs. - Includes barrel adjuster for on-the-fly changes - Lever pivots on a 21mm ball bearing for smooth operation - Engineered break-away pivot that allows the lever to break away from the mount in the event of a crash - Cable Kind Clamp does not damage secured cables and features captive hardware - Integrates with SRAM/Avid MatchMaker X clamp-equipped brake levers for better ergonomics
PNW Components Loam Lever Dropper Post Lever Kit
$69.99
Dropper post levers are something a lot of us overlook—we want our dropper to work but don't think about the button that makes the magic happen. After testing a bunch of levers, from the plastic ones to the ergonomically weird, even the best in class, we decided we could do better. So we made the Loam Lever. It's the most adjustable lever around, ensuring you can modify it to fit your exact ergonomic specifications. The lever's grippy, injection-molded pad has got your back in sloppy weather conditions. And, speaking of weather, we made sure the whole thing was as weatherproof as possible, meaning your lever won't squeak, bind up, or fail after being in the rain. The Loam Lever Has 5 Key Characteristics: 1. Adjustability - We believe precision matters, this lever provides two forms of adjustment so you can dial-in your perfect placement.  2. Weather Proof - Oversized high-quality sealed bearing paired with an additional seal and all stainless hardware for longevity and durability. 3. No-Slip Grip - Speaking of weather, the Loam Lever features a grippy, injection-molded thumb pad so you can drop or raise at the right time in even the sloppiest of conditions. 4. Techy AF - Custom CNC machining throughout the whole design of the Loam Lever for precision and weight reduction. 5. Direct Mount - Available in SRAM's MatchMaker X for Guide brakes and Shimano's I-Spec II for XTR M9000, XT M8000, SLX M7000, and DEORE M6046
Yuba Hold On
$69.99
Yuba's Hold On gives your traveling companion a sure grip when you're riding about town. This stem/handlebar combo attaches to the seatpost of Yuba Mundo's cargo bikes so they'll feel like they're on a bicycle built for two even if they can't help out with the pedaling.
Yuba Passenger Ring
$69.99
Yuba's Ring gives your passengers a safe, comfortable handhold as you cruise the streets looking for adventure. This aluminum accessory mounts to the rails of the passenger seat on Yuba's Boda Boda cargo bicycle.
Yuba Towing Tray
$69.99
Have you been looking for a way to take more bikes with you? Perhaps you’d rather bike to your cyclocross races to get warmed up? Or maybe you want to take your kid to the park with their bike to gain confidence before having to battle traffic? Fitting all Mundo V3, V4 and V5 models, the towing tray makes it possible to bring along any bike from a 12-inch up to a 29er, with a tire width of up to a 2.25-inches. It is made out of the same material as our Utility decks: recycled milk jugs. It is durable and tough. A side bumper will keep the towed bike from scratching your Mundo. Towing tray kit includes running board with a slot for front tire, and an adjuster for 20-inch, 16-inch, or 12-inch tires, and bumper. - Includes a Tow Tray + Running Board - Material: HDPE plastic - 2-Year Warranty - Note: Tow Trays are compatible only with the Mundo V4s and V5s
Fox Racing Shox Transfer Lever Assembly 2x/3x Remote
$65.00
Left/right on bar lever (for 2x/3x).
RockShox Maxle Lite Through-Axle
$55.00 - $65.00
RockShox's Maxle Lite is a lightweight aluminum through-axle system. It lets you remove and install your wheel as fast as with a standard quick-release while delivering the awesome stiffness with the improved strength and control of a through-axle. Plus, the lever can be closed in whatever position you like and no tools are required for installation and use!
RockShox Maxle Ultimate Front Thru-Axle
$65.00
The tool-free Maxle Ultimate Front brings exceptional stiffness and durability to your ride in a high clamping force, easiest-to-use internal cam thru axle system.
OneUp Components Dropper Post Remote V2
$64.99
An Aluminum remote with an oversized bearing and a super smooth action. The unique lever position allows you to keep a stronger grip on the bars while actuating your post. Don't think twice about dropping your post, even when charging into technical sections. The OneUp lever mimics your R/H shifter’s inboard upshift paddle position instead of the usual downshift paddle position of most remotes. This position requires considerably less thumb movement to reach the lever. NO BLEEDING The cable setup is quick and easy. The cable clamps at the lever making shortening the housing length for clean routing a breeze. Unlike a hydraulically actuated dropper, there is no temperature sensitivity and If your remote gets damaged you can still lower or extend your post by removing it from your frame and pushing on the actuator by hand. Kit includes cable and housing Compatible with all cable actuated dropper posts. SPECS Compatibility +22.2mm Bar Clamp - All other groups 10 speed Shimano +SRAM Matchmaker X - SRAM MMX clamps Weight: +Remote with 22.2mm Bar Clamp - 46g +Remote with SRAM Matchmaker X - 43g
Origin8 Single-Speed Conversion Kit
$59.99
• Converts a cassette hub to a single speed • 8 spacers included in various sizes to adjust chain line • Anodized 6061 aluminum • Fits Shimano/SRAM cassette bodies • Conical spacers for increased cog stiffness • Includes single-speed guide, spacers, as well as 18T & 16T cogs
Race Face Turbine Dropper Seatpost 1x Remote
$59.99
- Remote for use with Race Face dropper seatposts - Compatible with other brands - Horizontal Remote mimics the position of a left thumb shift lever
Problem Solvers BB30/Press-Fit 30 Adapter Kit
$55.55
The Problem Solvers BB30/Press-Fit 30 Adapter Kit consists of DuPont Delrin (a tough, light type of plastic) pieces that allow you to use your external bottom bracket-style crankarms (24mm spindles, such as a Shimano Hollowtech II crank) with newer BB30 and Press-Fit 30 bottom brackets. Please contact us if you have any questions about compatibility.
RockShox Maxle Lite Front Thru-Axle
$55.00
The tool-free Maxle Lite brings exceptional stiffness and durability to your fork in a light, easiest-to-use expanding wedge thru-axle system. - Thread Length: 9mm - Thread Pitch: 15 x 1.5mm
Wheels Manufacturing Inc. Enduro 6806/29 (DUB Compatible) ABEC-3 Sealed Bearings, Bag of 2
$52.00
Replacement Enduro 6806/29 ABEC-3 sealed bearings for Wheels Mfg DUB Compatible bottom brackets. - Dimensions: OD: 42mm / ID: 29mm / Width: 7mm - ABEC-3 - Grade 10, 5/32" chromium steel balls - Kyodo Yushi SRL grease or equivalent - Imported - Sold as Bag of 2
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