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Ciclismo Quarq

Quarq builds power meters designed to stay out of your way and give you accurate data across the full range of your output. The crank-based approach means power is measured at the source — before drivetrain losses — and the DZero and DFour lines cover the range from aluminum training cranks to AXS DUB-compatible spiders for SRAM Red and Force builds. The TyreWiz 2.0 extends Quarq's sensor expertise to tire pressure, giving you real-time pressure readings on your head unit so you can dial in your setup before the ride rather than guessing by feel.

The RA Cycles Quarq collection spans power meter cranks in BB30 and GXP configurations, the DFour AXS DUB spider for modern SRAM builds, DUB crank arms, TyreWiz tire pressure monitors, and supporting accessories.

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About Quarq

Quarq was founded in 2006 in Spearfish, South Dakota by Jim Meyer, who set out to build a power meter that worked reliably across all conditions without requiring a dedicated crank replacement. SRAM acquired Quarq in 2011, integrating the brand's sensor technology into the SRAM ecosystem while preserving Quarq's focus on accuracy and compatibility. Today Quarq power meters are used at every level of the sport, from amateur training to WorldTour racing, and the TyreWiz system has extended the same data-forward philosophy to real-time tire pressure monitoring. Learn more at Quarq's website

RA Cycles stocks the Quarq DZero line in BB30 aluminum, GXP aluminum, and GXP carbon configurations — all on sale from their original retail pricing — along with the DFour AXS DUB power meter spider for SRAM AXS builds, DUB crank arms, and the TyreWiz 2.0 system for real-time tire pressure tracking. The Adhesive Mount Magnet supports cadence sensor setups that require a frame-mounted magnet.

For more training and performance data tools, browse our bike power meters collection. Quarq's SRAM heritage makes it a natural pairing with our SRAM components selection, and our cranksets and chainrings collection covers the broader drivetrain picture.

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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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