Ro­tor 2in­power 3D+ power meter

£1,200, sad­dle­back.co.uk

Cyclist - - New Gear -

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

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