SRAM Rival AXS E1 DUB Power Meter Crankarm Upgrade

The SRAM Rival AXS E1 DUB Power Meter Crankarm Upgrade is a spindle-based left-arm replacement that slots directly into your existing Rival AXS setup — no new chainrings, no new spider, no rethinking your drivetrain. Power measurement lives inside the DUB spindle itself, reading left-side output and doubling it to calculate total wattage, all while adding less than 40 grams over a standard crankset.

A single AAA lithium battery powers the system for over 400 hours — enough for a full season of training and racing before you need to think about a swap. The unit carries an IPX7 waterproof rating, meaning it's built to handle rain, puddles, and pressure washing without complaint. It works with any standard DUB bottom bracket, so if your bike is already running that interface, installation is straightforward.

SRAM Rival AXS E1 DUB Specs at a Glance

• Measurement method: Left-side spindle-based power, doubled to estimate total output
• Weight penalty: Less than 40g over a standard crankarm
• Battery: Single AAA lithium — rated for 400+ hours
• Water resistance: IPX7 rated
• Bottom bracket compatibility: DUB standard
• Crank lengths available: 160mm, 165mm, 170mm, 172.5mm, 175mm