A more modern trend, mostly on mountain bikes, where stronger seatposts are required (without too much extra weight) led to a new “oversized” standard of 27.4 mm (and wider). Web 26.8 post normally equals a 28.6 clamp and a 27.2 post equals a 30 clamp (on steel frames anyway) lots here, and in red 😉. Reply quote f fbinny 1846 posts · joined 2009 #3 · mar 17, 2011 seat post clamps are sized by the seat tube diameter, not the seatpost diameter. Web although you know the seatpost diameter, the clamp size depends on the thickness of the seat tube. So always check the product description before buying.
The seat clamp diameter needs to match the diameter of your seat tube rather than your seatpost, which is a little smaller. Web looks like your seatpost diameter is 27.2 mm. Web for example, a 27.2mm seatpost (a size commonly found on road bikes) fits inside a 28.6mm diameter seat tube, so it’s a 28.6mm clamp you need. Web although you know the seatpost diameter, the clamp size depends on the thickness of the seat tube. Web i never did get the size straight but i think it was a 30mm.
The new clamp is much stronger with two bolts. Web frames made to standards will typically have 1 1/8 (28.6 mm) bicycles used 28 mm. After welding/brazing the tube is supposed to be reamed to take a 27.2 mm seat post. Cheap chinese unicycles with steel frames and 22.0 seatposts = 25.4 clamps. Web although you know the seatpost diameter, the clamp size depends on the thickness of the seat tube.
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Web thomson elite setback seatpost. Anyhow, what should have been the simplest of tasks wasn't. I didn't bother since i had an old 26.8 post that fit perfectly. (32) *free shipping on $50+. 25.4 seatpost = 28.6 seatpost clamp. Differences in the measure may correlate to quality, material, or weight. A more modern trend, mostly on mountain bikes, where stronger seatposts are required (without too much extra weight) led to a new “oversized” standard of 27.4 mm (and wider). The seat clamp diameter needs to match the diameter of your seat tube rather than your seatpost, which is a little smaller. Web 26.8 post normally equals a 28.6 clamp and a 27.2 post equals a 30 clamp (on steel frames anyway) lots here, and in red 😉. For example, a 27.2mm seatpost (a size commonly found on road bikes) fits inside a 28.6mm diameter seat tube, so it’s a 28.6mm clamp you need. The new clamp is much stronger with two bolts. Web 31.6mm is one of the standard seat post diameters. So always check the product description before buying. We couldn't tell you without knowing the seat tube thickness, but then you could do that math yourself: My old trek aluminum frame with 27.2 mm seatpost has roughly 3mm thick walls and takes a 34mm post clamp.
The Seat Clamp Diameter Needs To Match The Diameter Of Your Seat Tube Rather Than Your Seatpost, Which Is A Little Smaller.
Lots of hope seat clamps. Web thomson elite setback seatpost. 25.4 seatpost = 28.6 seatpost clamp. Web there are some standard post measurements out there, namely 28.6 mm, 30.0mm, 31.8mm, 34.9mm, and 36.4mm.
For Example, A Common Setup In Good Quality Steel Alloy Frames Is A Seat Tube With 28.6 Outer Diameter And 0.6 Mm Wall Thickness At The Top, Giving An Inner Diameter Of 27.4.
A more modern trend, mostly on mountain bikes, where stronger seatposts are required (without too much extra weight) led to a new “oversized” standard of 27.4 mm (and wider). Cheap chinese unicycles with steel frames and 22.0 seatposts = 25.4 clamps. I built a frame with a 28.6 o.d. Could be 31.8, but on a steel frame the tube is likely to be thinner than an alloy one, so.
My Old Trek Aluminum Frame With 27.2 Mm Seatpost Has Roughly 3Mm Thick Walls And Takes A 34Mm Post Clamp.
Web frames made to standards will typically have 1 1/8 (28.6 mm) bicycles used 28 mm. Obviously what size post i ended up using is irrelevant to the clamp i.d. Reply quote f fbinny 1846 posts · joined 2009 #3 · mar 17, 2011 seat post clamps are sized by the seat tube diameter, not the seatpost diameter. For example, a 27.2mm seatpost (a size commonly found on road bikes) fits inside a 28.6mm diameter seat tube, so it’s a 28.6mm clamp you need.
There Is No Standard Like That.
After welding/brazing the tube is supposed to be reamed to take a 27.2 mm seat post. There's a number of websites that confidently proclaim that 27.2 post = 28.6 clamp. Web i never did get the size straight but i think it was a 30mm. Web although you know the seatpost diameter, the clamp size depends on the thickness of the seat tube.