SRAM loses patent battle with Fox over X-Sync chainring

Latest ruling expected to end six-year dispute over tooth technology that cost both companies millions

SRAM Fox X-Sync

A ruling by the US Patent and Trademark Office has gone against SRAM, after Fox Factory challenged patent claims relating to SRAM’s X-Sync chainring design.

As reported by Bicycle Retailer and Cycling Industry News, the battle dates back to 2015 when SRAM and RaceFace (now owned by Fox) first locked horns over the chain-retaining features of the X-Sync chainring that was designed to be used in a 1x set-up with no front derailleur. SRAM had licensed the wide/narrow tooth design with inboard offset teeth to other brands including Accell and Chromag, but when RaceFace launched its own design, SRAM sued, believing its fellow US brand was infringing its patents.

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