Rotor is supplementing its existing crankarm-based power meters with a new single-sided system called INpower thatâs built within the companyâs 30mm-diameter bottom bracket spindles. It weighs less than 55g, itâs less expensive than Rotorâs dual-sided system, thereâs a wide range of crankset options (including for mountain bikes), and it even uses refreshingly common (and cheap) AA batteries.
Rotor's new INpower power meter can be added to nearly any of the company's cranksets
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- Spindle-based direct-measurement power meter with dual strain gauges
- 30mm-diameter UBB aluminium spindle
- 300-hour claimed run time
- Requires one AA battery
- Roughly 50g of additional weight
- ANT+ wireless transmission
- US$959-1139 / £649-699 / â¬799-949 / AU$TBC (left and right crankarms, spider, and spindle)
- US$779-869 / £499-599 / â¬649-725 / AU$TBC (left crankarm and spindle only)
- May availability
Tucking all of the critical bits inside the spindle offers up a number of practical advantages over a spider- or pedal-based power meter system. The axle-based format is largely protected from weather and impact, itâs visually inconspicuous, and very compact. The cylindrical form factor uses just one AA battery for up to 300 hours of ride time â and when a replacement is needed, theyâre extremely easy to find.
Save for the small ANT+ antenna, which is affixed to the end of the non-driveside crankarm, all of the power meter hardware is enclosed inside the spindle
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