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5DEV

5DEV starts with aerospace manufacturing and ends up at the trail. A division of 5th Axis — a San Diego CNC house that machines components for the aerospace and medical industries — 5DEV applies the same precision tooling and in-house manufacturing discipline to bicycle cranks, chainrings, and drivetrain components. The result is titanium cranks machined to tolerances that most bike brands don't approach, and a range of e-bike crank conversions that bring the same material quality to Shimano EP8, Bosch, Brose, and Specialized Turbo Levo motor platforms.

The RA Cycles 5DEV collection covers the full titanium lineup — MTB and RGXC cranks, eCranks for major motor systems, titanium chainrings in T-Type and multiple bolt patterns, ceramic bottom brackets, titanium pulley wheels, and the smaller titanium hardware that finishes a build the right way.
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About 5DEV

5DEV is a division of 5th Axis, a San Diego-based contract manufacturer that produces precision components for the aerospace and medical industries. The co-founders brought that CNC expertise to cycling — designing and building all 5DEV products in-house from space-grade billet aluminum and titanium, using patented tooling systems developed for their industrial work. The factory-to-rider pipeline means there are no outsourced parts and no tolerance compromises: every crank arm, chainring, and bottom bracket goes through the same CNC process that aerospace components do. Learn more at 5DEV's website

RA Cycles stocks the core 5DEV titanium lineup — the flagship Titanium MTB Cranks and RGXC Cranks for standard builds, along with eCrank options compatible with Shimano EP8, Specialized Brose, Bosch/TQ/Avinox, and the Gen 4 Levo motor platforms. The collection also includes 8-bolt and 3-bolt T-Type titanium chainrings, titanium ceramic bottom brackets, titanium pulley wheels for SRAM AXS and Shimano XTR/XT, and alloy handlebars.

For more drivetrain components, browse our cranksets and chainrings collection and bottom brackets. Riders building e-bike setups will also find relevant parts in our e-bikes section.

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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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