{"product_id":"bontrager-carbon-friendly-quick-release-seatpost-clamp-36-4mm-black","title":"Bontrager Carbon-Friendly Quick-Release Seatpost Clamp – 36.4mm, Black","description":"\u003cp\u003eThe \u003cstrong\u003eBontrager Carbon-Friendly Quick-Release Seatpost Clamp\u003c\/strong\u003e is a \u003cstrong\u003e36.4mm\u003c\/strong\u003e seat tube clamp designed for Trek and other bikes with a 36.4mm seat tube internal diameter — the standard seat tube size used on most Trek road and gravel frames. The \u003cstrong\u003ecarbon-friendly\u003c\/strong\u003e designation means the clamp uses a design that distributes clamping force evenly around the seatpost, avoiding the point loading that can damage carbon seatposts when standard clamps are overtightened. The \u003cstrong\u003equick-release lever\u003c\/strong\u003e allows tool-free seat height adjustment without needing a hex key, making it practical for riders who regularly adjust saddle height between rides or share a bike.\u003c\/p\u003e\n\n\u003cp\u003eThe clamp is a genuine \u003cstrong\u003eBontrager\u003c\/strong\u003e part, making it the correct OEM replacement for Trek bikes originally fitted with this clamp. It fits any seatpost with a \u003cstrong\u003e36.4mm outer diameter\u003c\/strong\u003e — verify your seatpost diameter before purchasing, as seatpost clamp size is determined by the seat tube's internal diameter, not the seatpost's outer diameter. Browse our full \u003ca href=\"\/collections\/seatposts\"\u003eseatposts collection\u003c\/a\u003e and \u003ca href=\"\/collections\/finishing-kit\"\u003efinishing kit range\u003c\/a\u003e for seatposts, saddles, and related components.\u003c\/p\u003e\n\n\u003ch3\u003eWhat It's Good For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTrek road and gravel frames with 36.4mm seat tube internal diameter\u003c\/li\u003e\n\u003cli\u003eCarbon seatposts — carbon-friendly design distributes clamping force evenly\u003c\/li\u003e\n\u003cli\u003eTool-free seat height adjustment via quick-release lever\u003c\/li\u003e\n\u003cli\u003eOEM replacement for Trek bikes originally fitted with this clamp\u003c\/li\u003e\n\u003cli\u003eAny bike with a 36.4mm seat tube internal diameter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat It's NOT Good For\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSeat tubes with internal diameters other than 36.4mm — verify your frame's seat tube size before purchasing\u003c\/li\u003e\n\u003cli\u003eDropper seatposts — dropper posts require a specific clamp compatible with the post's remote cable routing\u003c\/li\u003e\n\u003cli\u003eAggressive MTB use where a bolt-type clamp provides more consistent clamping force\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eHow do I know if 36.4mm is the correct size for my bike?\u003c\/strong\u003e\u003cbr\u003eThe seatpost clamp size matches the internal diameter of your frame's seat tube. Most Trek road and gravel frames use a 36.4mm seat tube. Check your frame's specification on the Trek website using your model and year, or measure the internal diameter of the seat tube opening. The clamp size is often also printed on the existing clamp.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat does \"carbon-friendly\" mean?\u003c\/strong\u003e\u003cbr\u003eCarbon-friendly clamps distribute clamping force evenly around the circumference of the seatpost rather than concentrating it at a single point. Standard clamps can create point loading when tightened, which can crack or delaminate carbon seatposts over time. Always tighten to the torque specified by the seatpost manufacturer regardless of clamp type.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use this with a dropper seatpost?\u003c\/strong\u003e\u003cbr\u003eNo — dropper seatposts require a clamp that accommodates the remote cable or hydraulic hose routing from the post. A standard quick-release clamp will not provide the correct cable routing and may interfere with dropper post operation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs a quick-release clamp as secure as a bolt-type clamp?\u003c\/strong\u003e\u003cbr\u003eFor road and gravel use, a correctly adjusted quick-release clamp provides secure and reliable seatpost retention. For aggressive MTB use where the saddle is subject to significant lateral forces, a bolt-type clamp provides more consistent clamping force and is generally preferred.\u003c\/p\u003e","brand":"Bontrager","offers":[{"title":"Default Title","offer_id":45477758402735,"sku":"425498","price":11.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0654\/2003\/4223\/files\/1707814593-67647200.jpg?v=1768518324","url":"https:\/\/www.swinnertoncycles.co.uk\/products\/bontrager-carbon-friendly-quick-release-seatpost-clamp-36-4mm-black","provider":"Swinnerton Cycles","version":"1.0","type":"link"}