Drivetrain Parts on Sale

If you're looking to take your training to the next level or simply want a better way to measure energy expenditure, an energy meter is your best bet. And the Power Cranks 105 Upgrade Kit are no exception. With our lightweight power sensor on a Shimano 105 crankset, it's the perfect way to get into the power meter game. The development of Power Cranks started with our Human Performance Team looking at riders in realistic scenarios on the bike. Historically, power meters have been validated by two different methods, one is measuring the torque produced by applying a static linear load to a crankset or chainring, while the second is using a power generator motor to pedal the bike, well, cycling is not neither static nor linear, and humans apply energy very differently than a machine, so we found that neither of these methods answers the "real world" question of accuracy. To get the best test accuracy in all kinds of riding scenarios, we built our own cycling treadmill, the WinMill, to measure power output to a known truth. This new benchmark allows us to assess accuracy in all riding conditions - sitting versus standing, various power and cadence levels, different weights and a multitude of equipment. This data acquisition process is our gold standard for testing power meters, and through our testing and external validation at the Locomotion lab in Boulder, Colorado, Power Cranks have been proven to have the highest accuracy in real-world scenarios (+/- 1.5%). The Power Cranks are also easy to use, with class-leading temperature compensation firmware and waterproof housings. Calibration is only necessary during seasonal temperature fluctuations, and the included wrench makes changing batteries easy. - +/- 1.5% real-world accuracy tested on WinMill and validated by the Locomotion Lab in Boulder, CO. - Works with ANT+ and Bluetooth® devices. - Easy setup and diagnostics with the Specialized Power app. (iOS and Android versions available). - Shimano 7000 Gen 105 left side power measurement. - Right crankset and chainring NOT included. - Available in 170-175mm crank lengths.

The XG-1299 cassette completes the expression of the world's most accomplished and sought after bikes. Designed for use with our proven, reliable XD driver body, this 12-speed cassette offers a massive gear range. In independent tests, the X-Dome architecture is proven to yield the strongest cassette on the market. New shifting characteristics improve both inboard and outboard shifting as well as chain retention. - SRAM’s cassette manufacturing technology provides the greatest durability and lightest weight - All-new shifting features create a smoother, quieter system with enhanced inboard and outboard shift performance - XD driver body compatible Cogs - 10 – 50T: 10, 12, 14, 16, 18, 21, 24, 28, 32, 36, 42, 50 - 10 – 52T: 10, 12, 14, 16, 18, 21, 24, 28, 32, 36, 42, 52

SRAM GX Eagle drivetrains are engineered for optimal performance. Eagle drivetrains are designed, tested, and proven to deliver durable performance for all riders. Eagle technology provides an expanded, optimum gear range and is 100-percent compatible with all levels of SRAM Eagle drivetrain systems. - The GX crankset is engineered for complete chain control with each tooth precisely designed to work seamlessly with the chain’s inner and outer links - The GX Eagle rear derailleur gets the job done with an updated cage architecture that improves chain management and is compatible with both 10-52T and 10-50T cassettes - The XG-1275 10-52T cassette offers expanded 520% gear range and features SRAM's Full Pin technology, making it both lightweight and durable - The trigger shifter puts total control of your gear selection into the thumb of one hand - GX Eagle chain for smooth and efficient shifting - DUB bottom bracket sold separately

The day-in, day-out Eagle ecosystem hero is now available with AXS. The GX AXS upgrade kit is your entry point into wireless drivetrain simplicity. Compatible with any of our Eagle ecosystem cassettes and crank arms, the upgrade kit allows you to experience AXS without needing to buy an entire groupset—provided you already are using Eagle products. No matter if you are looking to upgrade your ride or looking for great value replacement parts, look no further than the GX AXS upgrade kit. - Includes the SRAM GX Eagle AXS rear derailleur with battery, Eagle controller with clamp, charger with cord, and chain gap tool - The GX Eagle AXS rear derailleur shifts on command, whether under climbing load or sprinting to the stage finish, and is smart enough to protect itself thanks to its incredibly resilient Overload Clutch - Rear derailleur is compatible with 10-50t and 10-52t cassettes - The GX Eagle AXS controller offers a unique wireless shifting experience with ergonomic touchpoints that are customizable to your preferences. You can choose what each button does through the AXS App

X01 Eagle is the drivetrain for riders and racers who push for the purpose of gaining elevation. Whether having fun, progressing skills, or taking the win, X01 Eagle is designed and refined to support riders with the power of expanded capability. Includes: - Rear Derailleur with Battery and Battery Protector - Rocker Paddle Controller with Clamp - Charger/Cord - Chain Gap Tool