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Campagnolo's EPS Power Unit is the reliable brain of electronic shifting. Inside sits a 3-cell, 12-volt Lithium-ion battery that delivers up to 1,200 miles on a single charge. It also houses the electronics necessary to deliver pinpoint shifting precision to the front and rear derailleur mechanisms (sold separately). If you're cross-chained, the system immediately senses it and sends a message to the front derailleur to move ever so slightly to avoid chain rub. Plus, the one-piece, ultrasonically-sealed unit is impervious to water or road vibration.

The EPS Power Unit is the systems source of power as well as the "brain" of the system, responsible for managing the battery pack, enabling and monitoring the front and rear derailleurs and communicating with the Interface Unit. - Weathertight, o-ring sealed connectors - Lithium Ion battery duration: 500km/month - 1500km, 1000km/month - 1800km, 2000km/month - 2000km - Water proof to 1m for 30 minutes (IP67 Rated) - Operational temperature: -4F to 140F - Charging temperature: 32F to 113F - 17mm diameter for easy seat post installation - Battery charges through the Interface Unit - Compatible only with the Super Record/Record V3 Power Unit

The EPS Power Unit is the brain of the entire EPS system. The power unit input/output gate charges the battery and updates the firmware. The unit checks and manages the battery pack, interacts with the interface, drives the front and rear derailleurs, and displays system anomalies through an acoustic buzzer and RGD light. EPS V2 Power Units are for internal battery applications, under bottom bracket, or under chain stay mounting options and require the specific EPS V2 Interface. - Weathertight, o-ring sealed connectors - Lithium Ion battery duration: 500km/month - 1500km, 1000km/month - 1800km, 2000km/month - 2000km - Water proof to 1 meter for 30 minutes (IP67 Rated) - Operational temperature: -4F to 140F - Charging temperature: 32F to 113F

In conjunction with the EPS Power Unit, the Interface is the "thinking" center of EPS and is responsible for on board diagnostics, managing settings, converting analog signal from Ergo Levers to digital and sending it on to the Power Unit maintaining a dialogue with the Power Unit. - Required for use with Record TT levers and/or Bare End shifter - Compatible only with the Super Record/Record V3 Power Unit - Weathertight, o-ring sealed connectors - Waterproof to 1m for 30 minutes (IP67 Rated)

- Black carbon fiber weave headset spacers for tuning ride height, no logos - Kit includes 1-1/8" spacers: (15) 2.5mm, (25) 5mm, (16) 10mm, (2) 15mm, (4) 20mm

In conjunction with the EPS Power Unit, the Interface is the "thinking" center of EPS and is responsible for on board diagnostics, managing settings, converting analog signal from Ergo Levers to digital and sending it on to the Power Unit maintaining a dialogue with the Power Unit. - New shape with LED indicators on 3 sides - Battery charges through the Interface Unit, no more need to drill a charging port hole in the bicycle frame - Contains a wireless module allowing for connection to PCs, smartphones, tablets, etc., through ANT+ and Bluetooth Low Energy (BLE). Requires the use of Android 4.3 or newer, or iOS 8 or newer - Only compatible with Campagnolo Super Record and Record V3 Power Unit - Waterproof to 1m for 30 minutes (IP67 Rated) - Weathertight, o-ring sealed connectors - See PDF for complete details on the V3 app and customization

Campagnolo's EPS Interface Unit is like a translator, the vital but often overlooked 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.

- EPS under-seat shifter cable kit

In conjunction with the EPS Power Unit, the Interface is the "thinking" center of EPS and is responsible for on board diagnostics, managing settings, converting analog signal from Ergo Levers to digital and sending it on to the Power Unit maintaining a dialogue with the Power Unit. - Weathertight, o-ring sealed connectors - Waterproof to 1m for 30 minutes (IP67 Rated) - Compatible only with the Chorus Power Unit

- Required for charging Campagnolo V2 and V3 Power Units - Not compatible with Campagnolo V1 Power Unit

Vision's Mini TT Clip-On are a shorter set of clip-ons ideal for ITU triathlons or for hilly time trials on your road bike. They boast lightweight double-butted aluminum construction, 170mm-long extensions and aluminum arm rests with molded pads. An aero bridge is included that can be removed if you want to run bar-end shifters.

The Ohlins Stumpjumper Spring sets a new benchmark for spring rate accuracy and light weight for steel springs. - Ultra-fine spring rates to ensure perfect set up for all weights. - Spring rates are broken down to 4 N/mm (23 lbs./in). - Fits Ohlins TTX shock absorber for Stumpjumper FSR only. - Made with proprietary ultra lightweight steel, it's incredible for keeping your build weight down for trail riding.

The Ohlins RXF 36 Coil Fork Spring sets a new benchmark for spring rate accuracy and light weight for trail and all-mountain fork springs. - Ultra-fine spring rates to ensure perfect set up for all weights. - Spring rates are broken down to 0.9 N/mm (5 lbs./in). - Fits Ohlins RXF Coil fork only.

EPS cable kits come in multiple options that allow for the mounting of the power unit beneath the bottom bracket or beneath the saddle. - Weathertight o-ring sealed connectors - Allows for the mounting of the EPS Power Unit beneath the saddle - Only compatible with Chorus and Athena EPS systems

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

Surly Mr. Whirly Spindles. - 100% CroMoly steel - Proprietary dimensions and spline for use only with Surly Mr. Whirly cranks

EPS chargers and charger accessories specifically designed for charging all Campagnolo V2 and V3 batteries. - Extension cable is 50cm long - Requires use of EPS Power Unit Charger

Pro Compressionless brake housing eliminates flex from cable actuated braking systems, increasing power and improving lever feel. - KEB-SL - linear strand, Kevlar reinforced, compressionless brake housing with Slick-Lube liner - Perfect for full-housing, high-performance bikes with mechanical disc or rim brakes - 20 black alloy lined end caps, 10 black POP end caps included

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.

Stylish and strong, Salsa's Flip-Off Stainless Steel Quick-Release Skewers are a nice finishing touch on any bike. The shaft is constructed from stainless steel, which makes for a sturdy, durable, lightweight pair of skewers.

Sport brake housing packs high performance features into a colorful and durable package, making it a functional and aesthetic upgrade. - Slick-Lube lined housing reduces friction for faster cable movement and better braking response - High carbon internal steel coil for improved stiffness - Appropriate for Teflon coated cables as well as steel and galvanized

- Designed for use with MRP ISCG-05 boomerang chain guide systems - Adapts ISCG-05 compatible chain guide to fit BB-mount (flange/lockring)

- Lightweight alloy chain guard designed to keep a chain from dropping off the small ring - Braze-On only

The Problem Solvers Head Tube Reducers resize your head tube to accommodate different size forks. These fine aluminum reducers are designed for traditional, external-cup headsets. Please contact us for any questions about compatibility with your bicycle.

Problem Solvers' MisMatch Adapters allow you to combine your Shimano and SRAM shifters and brakes onto a single clamp for a more ergonomic, less-cluttered handlebar. These CNC-machined aluminum adapters work with Shimano I-Spec and SRAM MatchMaker components to fasten your preferred combination on to a single, existing bar clamp.

Turn your geared bike into a singlespeed machine with Surly's Singleator. The Singleator mounts to your derailleur hanger and provides a smooth, quiet and adjustable means of tensioning the excess chain slack on any bike. It's made from strong forged steel and features a triple-sealed spring, large-cog capacity, chain guides, fully-adjustable chain line, floating pulley, and a stainless-steel pivot bushing. And, it works with both BMX and standard chains.

EPS cable kits come in multiple options that allow for the mounting of the power unit beneath the bottom bracket or beneath the saddle. - Weathertight o-ring sealed connectors - Allows for the mounting of the EPS Power Unit beneath the bottom bracket - Only compatible with Chorus and Athena EPS systems

Original equipment rear derailleur pulleys for SRAM rear derailleurs. Fits X01, X01DH, X1, GX 1x11, NX, Force CX1, Force 1, Rival 1, Apex 1 Derailleurs. - Wide-narrow pulley tooth profile holds the chain better - Stainless steel sealed cartridge bearings

Dimension Steerer Extender adds 2 to 3-1/4" height to steerer. - Extender clamps to steerer; stem clamps to extender - Adds 2 to 3-1/4-inch height to threadless steerer - Includes top cap and long bolt - 40mm of threadless steerer is required for proper installation - Do not stack steerer extenders; no more than one steerer extender recommended per bike - WARNING: Dimension Steerer Extender is not recommended for use on forks with carbon fiber steerers

Low viscosity mineral oil for use with Campagnolo hydraulic brake systems. - Will not damage frame finishes - Does not absorb water so regular bleeding is not necessary - Non-toxic and will not irritate skin