Upgrading seatpost clamp.
09-27-20, 10:59 AM
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Upgrading seatpost clamp.
What is the best way to upgrade a seatpost clamp that can handle 27mm seatpost? My current clamp only holds 31.8mm.
09-27-20, 11:40 AM
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Well, either get a new seatpost that’s properly sized for the frame/clamp, or a shim if your post is too small, but you should really have a post that fits your frame/clamp properly.
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09-27-20, 11:45 AM
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I'm assuming the seatpost is the right size for the frame. The clamp can be adapted with some bits of sheet metal the right size. I've used steel because I had some lying around but a coke can might be a good source of some high grade aluminium.
09-27-20, 08:08 PM
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There is no upgrade for the wrong size seatpost. You need to get the proper sized seatpost for your frame. You can shim it out but there isn't a huge point unless you truly cannot find anything in that size. I am guessing the post might be a 31.6 which is a common size and easy to find posts for in a wide variety of materials and purposes.
09-28-20, 08:11 AM
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I've used a shim to run a 27.2 post in a frame built for 31.8 - it worked fine.
I've also had to replace a seatpost clamp due to a snapped bolt. Salsa offers a wide selection of clamp sizes, and they are solid clamps. So, I would look there if you need a new clamp.
On many frames, a 27.2 post requires a 31.8 clamp - this is the internal measurement of the clamp and includes the dimension of the post and frame. Some frames have thinner tubing, so they need a smaller clamp.
If you are unsure, use a caliper to measure the frame to determine what size clamp you need. Then just order one online. 31.8 and 34.9 are very common sizes.
I've also had to replace a seatpost clamp due to a snapped bolt. Salsa offers a wide selection of clamp sizes, and they are solid clamps. So, I would look there if you need a new clamp.
On many frames, a 27.2 post requires a 31.8 clamp - this is the internal measurement of the clamp and includes the dimension of the post and frame. Some frames have thinner tubing, so they need a smaller clamp.
If you are unsure, use a caliper to measure the frame to determine what size clamp you need. Then just order one online. 31.8 and 34.9 are very common sizes.
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