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Bike Power Meters - RA Cycles

Medidores de potencia para bicicletas

Training with power is the most objective way to measure effort — and the Bike Power Meters collection at RA Cycles covers 124 meters across every mounting system available. Crank-arm meters from 4iiii attach to your existing Shimano cranks and add measurement without replacing the crankset. SRM's PM9 systems are standalone precision cranksets with a long reputation in professional training data. Campagnolo and SRAM offer power integration built directly into their top-tier cranksets. On the pedal side, Favero's Assioma Pro and Garmin's Rally series convert your pedals into the measurement point — dual-sided or single-sided depending on how much data precision you want. Each approach involves genuine trade-offs around install complexity, accuracy, and compatibility with your existing drivetrain. The collection covers all of them.
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About Bike Power Meters

The main decision with power meters is where on the bike to measure. Pedal-based meters (Favero Assioma, Garmin Rally) are the most portable — they transfer between bikes easily and measure single or dual sided depending on the model. Cleat compatibility matters: Favero uses a Keo-style cleat; Garmin Rally makes SPD-SL (RS series) and SPD (XC series) variants. Crank-arm meters like 4iiii bolt onto existing cranks — an efficient upgrade without replacing your crankset. Dedicated power meter cranksets (SRM, Campagnolo with power, SRAM with power) integrate measurement into the component itself. Dual-sided measures both legs independently for true power; single-sided measures one leg and doubles it, which works well for most training purposes.

The 124 products cover every approach. SRM leads at the top with the PM9 crankset system, available with THM and Campagnolo interfaces in multiple spindle configurations. 4iiii's Precision 3+ bolt-on models cover Dura-Ace R9200, Ultegra R8100, and 105 R7100 in dual and single-sided versions. Favero's Assioma PRO pedals are available single or dual sided. Garmin Rally covers Look Keo/SPD-SL (RS series) and SPD (XC series) in both measurement configurations. Campagnolo Super Record 13 WRL and SRAM Red E1 round out the crank-integrated options.

Pair your power meter with a cycling computer to display your data. Browse bike pedals if you're weighing pedal-based measurement, or see cranksets and chainrings for crankset compatibility context.

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R&A Cycles - 50th Anniversary

50 YEARS AND COUNTING

From a Brooklyn storefront to flagships in Walnut Creek and Miami, from handwritten mail orders to a fully digital custom bike builder — RA Cycles has spent half a century doing one thing: serving riders who demand the best. That half-century belongs as much to you as it does to us. The riders who kept coming back, who sent their friends, who trusted us with bikes that matter — you're the reason we're still here. Here's to the next fifty.

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