REX 2 INpower MTB Left Only

  • Sale
  • $350.00
  • MSRP $650.00

Update your existing REX2 crank to a power meter with the addition of the left arm only.
The INpower REX 2.1 single chainring 1x cranks place power meter technology inside the crank axle where is protected it from loose rocks and other shocks, crashes, and outside contaminants like mud, sand, and clay. If you know your Optimum Chainring Angle, which you can find with INpower's TORQUE 360 and OCA pedal analysis, you can dial in your oval QX1 rings to your advantage. Forged and CNC-machined in Spain from 7075 aluminum alloy, INpower REX 2.1 for MTB features unprecedented data sampling technology, which takes into account abrupt changes in terrain like jumps and drops to accurately measure your power output.


  • Spider: 76 BCD
  • Sizes: 170/172.5/175mm
  • Battery specifications: AA 1.5 V
  • Estimated battery life: 300 hours riding time
  • Water resistance: IPX7
  • Strain gauges: 4 gauges in the axle
  • Wireless technology: ANT+™ 2.4 Ghz
  • Weight without batteries: 566g
  • Data transmitted: power, cadence, TORQUE 360, OCA, torque effectiveness (left side), pedal smoothness (left side)
  • Head unit: ANT+™ compatible head units
  • Analysis Software:
  • Crank Software: ROTOR INpower User Software
  • Q-Factor: 163 mm
  • Chainline: 50.6 mm
  • Material: 7075-T6 forged and CNC-machined aluminum alloy
  • Compatibility: bottom brackets BSA, BB89, BB92, BB30, PF30, BBRight, Cannondale F-Si Ai (spider sold separately), oval and round chainrings,76BCD, 9,10 and 11 speed

INpower User Manual - English

All other INpower downloads can be seen here




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