OK, I know that my measuring calipers are really old and my eyes are not nearly as keen as they used to be but I do admit that I need a little help here. I recently stripped a pin from the seat clamp of my Summit trials uni. I measured the O.D. of the seat tube at 31.2. I contacted Uni.Com and Bedford looking for a replacement. However, both said that they cannot find a replacement from any of their distributors. I contacted Kris Holms - looking for the manufacturer in Asia – but Kris said that these are off-the-rack- bicycle components and any bicycle distributor should be able to hook me up, I did a Google search of clamps only to find a few 31.0mm and even fewer 32.0mm and certainly no 31.2mm.
Can somebody who has access to a Summit, a good set of measurement calipers and the eyes to read it get me a measurement of the O.D. of the seat tube at the clamp?
*I contacted Kris Holms - looking for the manufacturer in Asia – but Kris said that these are off-the-rack- bicycle components and any bicycle distributor should be able to hook me up. Can somebody who has access to a Summit, a good set of measurement calipers and the eyes to read it get me a measurement of the O.D. of the seat tube at the clamp?*
Tommy, regrets that I can't help in the caliper department, but I can confirm the off-the-rack aspect. I wanted to swap the two-allen-bolt OEM clamp on my Summit for a quick release, and was able to pick up one--a Salsa I believe--at my LBS. Maybe just drag your Summit in with you and you can test what they have right there?
yeah, like my main man Tom says. the summit seat tube is a standard size..just bring it to a shop and im sure they will have a clamp that fits. if you go with a single bolt clamp make sure it is a big bolt with a 6mm hex key at least. dont go with anything that has less than a 5mm hex key bolt. the ones with the 4mm hex bolts are easily stripped.
-- jagur - Random Unicyclist
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isn't that measured inner diameter? so possibly a 31mm? as others have said, go to bike shop, say "I need a new clamp for my unicycle." someone should be able to help you out.
Knowing that one of the Salsa clamps will fit gives me hope. That Salsa clamp comes in 31mm and 32mm. I have tried the "Hi guys, I need a seat clamp" routine - with no success. That is why I wanted the measurement so that I could expand my search without actually having to be there in the shop with my uni .
If I remember correctly, the inside diameter is 29.2mm and the outside is 30.7mm. I'm actually not sure on the inside, because with the above figures, that leaves a frame thickness of .75mm. But then I never measured the frame thickness, and three quarters of a mm sounds really small. I have a KH post (27.2) and a shim, so maybe those numbers are correct. I am pretty sure on the 30.7mm because that's what Darren told me and that's also what the bike shop told me they couldn't get. I was lucky enough to have the previous owner send me the clamp.
It feels like it is time for me to call Steve Howard. I may need start with a block-o-aluminum and just make one. With all the time that I've lost looking for a clamp I could have made one. At least it is winter and not cutting into my riding time as much as it would have in September.
I finally found a seat clamp that will fit my beloved Summit. Though it is only a single bolt clamp it is holding firm. FYI: The seat clamp size that fits was marked as 31.8mm. Tommy
