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The seatpost is the last contact point between your frame and your body — it sets your saddle position, influences how much road vibration reaches you, and on a mountain or gravel bike, determines whether you can drop your saddle mid-ride for technical terrain. Seatposts at RA Cycles covers the full range: lightweight carbon road posts, electronic and mechanical dropper posts for MTB and gravel, frame-specific integrated posts for proprietary aero designs, and seatpost clamps to complete the fit.

Road riders will find options from THM, Darimo, Look, and 3T — from ultra-premium carbon to practical alloy. Dropper post options include the RockShox Reverb AXS, Fox Transfer Neo Factory, and Wolf Tooth Resolve in multiple diameters and travel lengths for trail riding and gravel touring.

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Seatposts

A few key specs determine seatpost compatibility: diameter (27.2mm for most road frames, 30.9 and 31.6mm for many mountain bikes, and proprietary sizing for integrated aero designs), and offset — whether you need a setback post to move the saddle rearward or a 0mm post to align it directly over the bottom bracket. Material choice comes down to priorities: aluminum posts are durable and straightforward; carbon posts typically reduce weight and absorb more road vibration, which adds up on long days in the saddle. For mountain and gravel riding, a dropper post adds the ability to lower the saddle on the fly — a meaningful functional upgrade on technical trails or rough descents, and available in both cable-actuated and wireless electronic versions.

RA Cycles carries road and mountain seatposts from THM, Darimo, Look, 3T, RockShox, Fox, Wolf Tooth, and more. At the premium end, the THM Mandibula is an ultra-light carbon post built for road performance, while Darimo makes frame-specific posts for proprietary aero designs including the Colnago Y1Rs and Pinarello Dogma F. Look covers both road and triathlon with the LS1 Carbon and 496 TRI. For dropper posts, the RockShox Reverb AXS is available in standard and XPLR travel options for trail and gravel use, the Fox Transfer Neo Factory covers trail and enduro terrain, and the Wolf Tooth Resolve offers a streamlined option for cross-country and gravel.

Shop related categories including bike saddles, mountain bikes, gravel bikes, and bike components.

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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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