Add power to any Rival build — no new crankset required.

The SRAM Rival AXS E1 Left Arm & Power Meter Spindle is the cleanest power meter upgrade on the market. The entire measurement unit lives inside the DUB spindle — invisible from the outside, perfectly integrated with your existing components. If you're already running a Rival AXS crankset, this is all you need to start training with power. Install it in minutes, pair it to your head unit, and ride. That's it.

Compatible with DUB and DUB Wide. The standard DUB spindle (44.7mm chainline) suits most road and gravel bikes. The DUB Wide spindle (47.5mm chainline) is designed for wider bottom bracket shells and XPLR gravel builds. Both versions use the same power meter unit — choose the spindle that matches your bottom bracket.

400+
Hours Battery Life
IPX7
Waterproof Rating
<40g
Weight Penalty
12/13
Speed Compatible

What makes this worth it

Spindle-Based Accuracy

The power meter unit is built into the spindle itself — the most structurally stable location on the drivetrain. Measures left-side power and doubles it to calculate total watts, delivering consistent, repeatable data every ride.

A Season on a Single Battery

400+ hours of battery life means you'll change it once or twice a year at most — and it takes a standard AAA lithium battery you can buy anywhere. No proprietary cells, no USB charging cables, no dead unit mid-ride.

Invisible Integration

No pods, no external sensors, no sticky mounts that fall off after a wet ride. The entire unit is concealed inside the spindle. From the outside, it looks identical to a standard Rival crankset — because it essentially is one.

DUB Bottom Bracket Compatibility

Works with any SRAM Road DUB or Road WIDE DUB bottom bracket — choose the spindle variant to match your frame's BB shell. DUB (44.7mm chainline) for standard road frames; DUB Wide (47.5mm) for wider shells and XPLR gravel builds.

IPX7 Weatherproof

Rated IPX7 — fully waterproof to 1 metre depth for 30 minutes. Sealed spindle construction means rain, puddles, and jet washing won't affect performance. Train through the Australian winter without worrying about your data.

Chainring Flexibility

Because the power meter lives in the spindle — not the chainring or spider — you can swap chainrings freely without recalibrating or replacing the unit. Change gearing for different events or terrains and the power meter comes along unchanged.

Specifications

BrandSRAM
Model IDPM-RIV-ASSY-E1
SeriesRival AXS E1
ProductLeft Arm & Power Meter Spindle (upgrade assembly)
Speed Compatibility12 / 13-speed
Spindle InterfaceDUB (standard) / DUB Wide
Chainline — DUB44.7mm
Chainline — DUB Wide47.5mm
BB CompatibilityAll SRAM Road DUB BBs; All SRAM Road WIDE DUB BBs
Crank Arm Lengths160mm, 165mm, 170mm, 172.5mm, 175mm
Power Meter TypeSpindle-based, left side (calculates total watts)
WirelessAXS (Bluetooth + ANT+)
BatteryAAA lithium, user replaceable
Battery Life400+ hours
Waterproof RatingIPX7 (1m depth for 30 minutes)
WeightLess than 40g heavier than standard crankset
Chainring MountDirect Mount (DM) — chainrings sold separately
IncludesLeft arm + power meter spindle only (right arm, BB, spider, chainrings not included)

(00.3018.403._)

Spindle-Based Accuracy

The power meter unit is built into the spindle itself — the most structurally stable location on the drivetrain. Measures left-side power and doubles it to calculate total watts, delivering consistent, repeatable data every ride.

A Season on a Single Battery

400+ hours of battery life means you'll change it once or twice a year at most — and it takes a standard AAA lithium battery you can buy anywhere. No proprietary cells, no USB charging cables, no dead unit mid-ride.

Invisible Integration

No pods, no external sensors, no sticky mounts that fall off after a wet ride. The entire unit is concealed inside the spindle. From the outside, it looks identical to a standard Rival crankset — because it essentially is one.

DUB Bottom Bracket Compatibility

Works with any SRAM Road DUB or Road WIDE DUB bottom bracket — choose the spindle variant to match your frame's BB shell. DUB (44.7mm chainline) for standard road frames; DUB Wide (47.5mm) for wider shells and XPLR gravel builds.

IPX7 Weatherproof

Rated IPX7 — fully waterproof to 1 metre depth for 30 minutes. Sealed spindle construction means rain, puddles, and jet washing won't affect performance. Train through the Australian winter without worrying about your data.

Chainring Flexibility

Because the power meter lives in the spindle — not the chainring or spider — you can swap chainrings freely without recalibrating or replacing the unit. Change gearing for different events or terrains and the power meter comes along unchanged.

BrandSRAM
Model IDPM-RIV-ASSY-E1
SeriesRival AXS E1
ProductLeft Arm & Power Meter Spindle (upgrade assembly)
Speed Compatibility12 / 13-speed
Spindle InterfaceDUB (standard) / DUB Wide
Chainline — DUB44.7mm
Chainline — DUB Wide47.5mm
BB CompatibilityAll SRAM Road DUB BBs; All SRAM Road WIDE DUB BBs
Crank Arm Lengths160mm, 165mm, 170mm, 172.5mm, 175mm
Power Meter TypeSpindle-based, left side (calculates total watts)
WirelessAXS (Bluetooth + ANT+)
BatteryAAA lithium, user replaceable
Battery Life400+ hours
Waterproof RatingIPX7 (1m depth for 30 minutes)
WeightLess than 40g heavier than standard crankset
Chainring MountDirect Mount (DM) — chainrings sold separately
IncludesLeft arm + power meter spindle only (right arm, BB, spider, chainrings not included)
SKU 00.3018.403._
Brand SRAM
Shipping Weight 0.4500kg