Light, stiff, and modular. The SRM Origin Composite crank arms blend carbon fiber with aluminum to deliver alloy-like stiffness at a meaningfully lower weight, sitting neatly between SRM’s full-alloy and full-carbon options. Built for the Origin ecosystem, they pair with interchangeable spindles (24 mm, 30 mm, or DUB 29 mm) and any SRM Origin spider, so you can move the same cranks across road, track, gravel, or CX builds with the right spindle and spider combo.

Highlights

- Carbon–aluminum composite construction: for a strong, responsive feel with real weight savings over alloy arms.

- Modular Origin system: swap spindles and spiders to fit different frames and drivetrains (24 mm, 30 mm, or DUB 29 mm).

- Low system weight: approx. 342 g per set of arms (175mm/no spindle), positioned between SRM Aluminum and SRM’s premium carbon options.

- Wide size range: 150–175 mm lengths to suit fit and cadence preferences.

- Dial-in stance: typical Q-factor ~149.5 mm (road) or ~145.5 mm (track) depending on spindle/spider selection.

Specifications

- Material: Carbon–aluminum composite crank arms; aluminum pedal inserts
- Weight (arms only): ~342 g per pair (excludes spindle; actual may vary by length)
- Lengths: 150, 155, 160, 165, 170, 172.5, 175 mm
- Spindle compatibility: SRM Origin 24 mm, 30 mm, and DUB 29 mm (aluminum or titanium spindles available)
- Interface: SRM Origin direct-mount spider with lockring (SRM lockring tool required)
- Q-factor (typical): ~149.5 mm road, ~145.5 mm track (varies with spindle and spider)
- Use cases: Road, Track, Gravel/CX (select appropriate spider: 110/130 BCD, 1x direct-mount, or 144 BCD Track)

WHAT'S INCLUDED: Left & right crank arms only; spider, spindle, chainrings, bottom bracket, and tools sold separately.