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Pioneer Shimano R9100 Left Leg Power Meter Crank Arm

$629.99ea
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Backorder: This item is currently out of stock but is available to purchase today as a backorder. The expected availability date shown above is our best estimate as to when it will be shipped to you, but this date is subject to change based on our receipt of this item from its vendor. Shipping in the continental US is free for all backorder items (for international orders, our customer service team will contact you when the item is available to ship). Your credit card will not be charged until your item ships (Paypal requires payment up front, but you can cancel for full refund). Anytime prior to shipment, your backorder can be cancelled by contacting our customer service team.

The Pioneer Shimano Dura Ace R9100 Left Leg Power Meter Crank adds force-measurement technology in a directly replacement for the standard non-drive arm on Shimano Dura Ace 9000 or 9100 cranksets. Pioneer’s Lightweight Power Sensor measures force vectors every 30° of crank rotation. This means 12 points of measurement every pedal stroke, and, when used in combination with Pioneer’s Touchscreen Cycle-Computer, the information is used to display real-time pedaling efficiency to show not only how much power the rider outputs, but how much of it is effectively used or is merely wasted. When used with any other ANT+ capable cyclo-computer, power numbers are available according to the features of the paired computer.

The Pioneer Lightweight Power Sensor adds just 22 g to the standard weight of the crank arm for a total weight of 219 g. Estimated operating time is 180 hours on one user-replaceable CR2032 battery. Available in multiple lengths.

Note: The power sensor adds 9 mm to the inside width of the standard crank arm, which may cause interference on some frames. Please measure before installation to ensure compatibility and prevent frame / component damage.

Please note: This product ships signature required.

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Reviewed 6/3/2018
by Anony
Competitive Racer
Southern Oregon Cascades and Siskiyous
Overall Rating
Works well and the price is right

I bought this to put on my road bike as a cheaper option for a power meter. I spend more time on my tri bike (I have a Quarq on that and its great) and use the road bike in the off season or for causal rides, group rides or when I want that KOM.

Since this one only takes your left side into account, the accuracy may be off a touch. For my application, that is totally acceptable. And to be honest, Im not sure I really noticed much difference. Installation is super easy since you dont have to make sure the B.B. works, or get the right adapters. Just pull off the left crank, put this on and done. It syncs with my Garmin Forerunner 935 ANT and havent had any issues with it dropping out of losing a connection.

So far, so good.

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