Learn me about seat post clamps
- Thread starter walter
- Start date
mwlikesbikes
Well-Known Member
It may or may not have the size printed or stamped on it. Clamp size is dictated by the outside diameter of the seat tube, typically 3mm to 5mm bigger than the seatpost.
Oddly enough my Seven HT has a 27.2 post, my Pivot FS has a 30.9 post, my gravel bike has a 31.6 post and they all use a 34.9mm clamp.
You really just need to measure your seat tube O.D. to be sure
Oddly enough my Seven HT has a 27.2 post, my Pivot FS has a 30.9 post, my gravel bike has a 31.6 post and they all use a 34.9mm clamp.
You really just need to measure your seat tube O.D. to be sure
Last edited:
Karate Monkey
Well-Known Member
Probably 34.9/35, unless you have a super ritzy frame, then it could be 34.
A caliper will solve your question right quick.
A caliper will solve your question right quick.
JDurk
Well-Known Member
The website of the bike manufacturer may have that info in the specs. It may be etched on the collar somewhere. If not, measure outside diameter with some calipers, then pick a properly sized collar.
mwlikesbikes
Well-Known Member
Some cheap and cheerful caliper choices. The Pittsburgh stuff is perfect for casual use.
www.harborfreight.com
Calipers - Harbor Freight Tools
Harbor Freight buys their top quality tools from the same factories that supply our competitors. We cut out the middleman and pass the savings to you!
www.harborfreight.com
Some cheap and cheerful caliper choices. The Pittsburgh stuff is perfect for casual use.
Calipers - Harbor Freight Tools
Harbor Freight buys their top quality tools from the same factories that supply our competitors. We cut out the middleman and pass the savings to you!
im sure @Patrick would agree, if you want to do it right you need a micrometer! 🤣 🤣
be careful with the HF (or many any digital) calipers, it is very easy to hit the zero button without the jaws closed and then f-up your measurements.
JDurk
Well-Known Member
Some cheap and cheerful caliper choices. The Pittsburgh stuff is perfect for casual use.
Calipers - Harbor Freight Tools
Harbor Freight buys their top quality tools from the same factories that supply our competitors. We cut out the middleman and pass the savings to you!
Starrett and Mitutoyo dial calipers at work, going back to at least 30yrs old.
HF digital at home for the casual use, metric and throw away when dropped on the concrete garage floor.
we use starret dial units at work, i have a couple of the cheapo HF digitals, they work fine for occasional use, i just cant bring myself to buy a nice set for home when i have them at work and can transport for anything actually important.
jklett
Well-Known Member
For measuring for parts like seat post clamps(or most bike parts for that matter) you can even get by with a tape measure if you want. Cheap calipers will work fine for this application, there's enough of a jump between sizes where if your off by a tenth of a mm you can still figure out the right part. I have plenty of calibrated high end metrology equipment to work with and I never need any of it for figuring out what bike parts to buy. It's not like we're machining new parts to a precise tolerance(at least not most of the time), we're trying to see if it's 31.8mm or 34.9mm. Don't overthink it.
The Kalmyk
Well-Known Member
And its adjustable for the bike should it be different size
