ROTOR manufactures an axle-based power meter called the INpower. The ROTOR INpower 3D+ places its 4 strain gauges inside the axle. (Hence the name ‘INpower’). The INpower uses ROTOR’s 30 mm UBB (Universal Bottom Bracket) design which allows ROTOR to use the same power meter with both their road and MTB cranks. Another advantage to the axle-based design is that it means the critical components of the power meter are safe from impact, dirt and water. The INpower is available for MTB, road and triathlon/TT.
The INpower can be purchased as a complete crankset, or as a left arm only option. The latter option is convenient for cyclists who already own a current set of ROTOR cranks. They can therefore purchase a left arm only power meter, enabling them to simply swap out their current left arm for the new, power-equipped one.
Why the ROTOR INpower
Integrated Electronics Inside
Electronics and battery are integrated inside the axle, making INpower shock and contaminant resistant, and waterproof with cleaner data transfer.
NEW Features Optimized for Q-Rings
TORQUE 360 and OCA (Optimum Chainring Angle) help cyclists precisely and accurately analyze force variations in their pedal stroke.
Compatible With All ROTOR 30 mm Cranks
INpower’s axle-based technology offers a wide range of cranks for both road and off-road riding.
Tool-free Battery Replacement
INpower uses a standard AA battery that typically lasts 300 hours when fully charged. A rechargeable AA battery can also be used.
INpower is equipped with the UBB30 axle. UBB30 is a 30 mm diameter axle which is compatible with almost all standard frames in the market (when used with the correct spacers). ROTOR INpower can be installed on your bike even if your current cranks are 24 mm diameter.
Specifically, UBB30 is compatible with the following standards: BB30 (68/73 mm), PF30 (68/73 mm), BSA threaded, ITA threaded, BBright and BBright Direct Fit, BB86, BB386 EVO, BB89 and BB92.
The only frames not compatible with the UBB30 system are BB90 and BB95 (both for 24 mm diameter axle).
ROTOR INpower 3D+
Power Meter Type
Axle / Bottom Bracket
Number of strain gauges
525 grams (110, 170)
Crank Arm Lengths
165 (110 MAS), 170, 125.5, 17 5mm
110, 110 MAS, 130 MAS
Left/Right Power Measurement
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