Rotor 2inpower 3D+ power meter
irst, Rotor aimed to boost power by introducing its ovalised chainrings. Now it’s looking to measure that power with its 2inpower 3D+ crankset.
Rotor’s first foray into the world of power meters came in 2013 with a slightly abortive dabble into crank-based systems akin to Stages, called the Rotor LT, which measured from a single leg. The company quickly changed tack, instead opting to put strain gauges in the axle with a similarly singlesided system called Inpower. Now, with a masterful fusion of the two, we have the two-sided 2inpower.
The new set-up means power, which is measured 200 times per second, can be isolated between each leg to identify imbalances and pedalling issues. The meter can generate metrics such as torque effectiveness, pedal smoothness and can also model the perfect position for an ovalised Rotor Q-ring, should you use one.
‘We’ve used opposed strain gauges in the axle and the drive-side crank,’ says Lara Janssen, product manager at Rotor. ‘That way the system automatically adjusts to temperature – essentially one lengthens while the other shortens.’ To find out more about the benefits (or otherwise) of one- and two-sided systems, see our feature on power meters on p132