Rotor REX 1.1 INPower Powermeter Boost Crank Arm

Rotor's INpower REX 1.1 Boost Power Meter Crank Arms beg on immediate question: What kind of mountain biker wants power measurement? The answer: Us. And by "us," we mean roadies-cum-endurance hammerfesters and enduro shredders who relish the pain of climbs as much as the pleasure of dropping in. Plus, we admit that it's just a lot of fun to be able to record, parse, and analyze pedal stroke data—a fact that's even more true on the trail, where constantly changing gradients and terrain mean power output isn't as simple as push pedal; go up road.

Instead of the dual-leg, eight-gauge approach of the 2INpower model, the INpower meter uses four gauges to measure power and pedal stroke data coming through the left crank arm only. The strain gauges themselves live in the spindle. This provides more protection against the elements (be they rain, snow, or trail furniture encountered during the occasional user error), and it also helps to tidy up the crank's silhouette by eliminating bulbous protrusions at the crank arm/chainring interface—of course, the grooved crank arms and (should you run them) Rotor's iconoclastic chainrings will still stand out.

  • Take the power to the trail with Rotor's mountain crank
  • Four strain gauges extrapolate total output from left crank arm
  • Charts cadence with internal accelerometer
  • Electronics housed in spindle to protect from elements
  • Replaceable AA batteries ensure a re-upping isn't a chore
  • Lightweight, stiff alloy construction proven on the biggest stage
  • Pair with Q-rings for maximum training metrics
  • Partnership with TrainingPeaks makes for seamless data management
  • Arm Material: 7055 aluminum
  • Arm Length :170mm, 172.5mm, 175mm
  • Bolt Circle Diameter :76mm
  • BB Type:BSA, BB89, BB92, BB30, PF30, BBRight
  • Spindle: 30mm
  • Q Factor: 163mm
  • Chainline :50.6mm
  • Recommended Use:cross-country, enduro, trail

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