Rene Herse One-By Crank


Rene Herse cranks are ideal for one-by setups: Light, strong and easy to dial in. The one-by chainrings have alternating ‘thick/thin’ teeth that have been optimized to mesh perfectly with the chain. The chain won’t derail and fall off even with the extreme chain angles of 12-speed drivetrains.

We offer a choice of crankarms: If you’ll only ever want to run a single chainring, our single-specific crankarms are the lightest and most elegant. Or choose our convertible crankarms that use a custom-machined spacer on the chainring tab – that way, it’s easy to install a second (and even third) chainring in the future.

Rene Herse crank bolts and pedal washers are included. 40-tooth chainring.

We recommend SKF JIS bottom brackets for Rene Herse one-by cranks.

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  • Bottom bracket:
    • JIS taper
    • for 45 mm chainline (most bikes): 113 mm spindle (SKF 110 mm)
    • for 47 mm chainline (to clear extra-wide chainstays): 116 mm spindle (SKF 113 mm)
  • Narrow Q factor: 139 - 145 mm (depending on spindle length)
  • Length: 165, 171, 177 mm
  • Weight:
    • Arms only (165 mm): 372 g
    • Complete crankset (171 mm, 40-tooth chainring): 476 g
  • Forged 2014 arms for high strength
  • CNC-machined 7075 chainrings for long wear
  • Meets EN “Racing Bike” standard for fatigue resistance
  • Assembled in Seattle from parts made in Taiwan and USA
  • 10 year warranty