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seat post sizing question(6 posts)

seat post sizing questionAngusMachuge
May 15, 2002 9:21 PM
I recently purchased a 27.0mm seat post for my road bike after the old one cracked around the seat binder, not realizing that the correct size was 27.2. To make a short story long, the tube was bought on a clearance sale and can be neither returned or exchanged, so I'm stuck with it for now. My lbs didn't have any shims, and my student lifestyle means buying another seat post means less to eat for a week or two. Will any harm result from using the seat post as is(in an aluminum caad4 cdale frame)? I was told by another cyclist to cut a strip from an aluminum pop can to use as a shim, but is this a good idea? Any other ideas?

PS: I now know that seat post sizes are stamped on the post, I always learn the hard way :-)
Popcan as shim is fine...PODIUMBOUNDdotCA
May 15, 2002 10:02 PM
I've done it before and although not perfect and your seatpost may slide down over time it does work. So go for it! Unless you want to resell it for the price you got it on ebay!

Shim itNessism
May 16, 2002 5:01 AM
You can shim the post although I'm not sure the soda can (or should I say beer can for you student types?) will be the proper thickness. You will need something 0.1 mm thick (0.004"). Most machine tool supply houses sell shim stock in .001" increments so you can always go this way. Just ask for a piece of .004" and cut it to shape with some old scissors.
Just checked a soda can...Nessism
May 16, 2002 6:36 AM
...and it measures 0.004" which is perfect. Make sure to be careful when cutting up the can, the edges are sharp as a knife.

Mr. Micrometer to the rescue! (nm)Sintesi
May 16, 2002 7:35 AM
six pack of shimsAngusMachuge
May 16, 2002 8:57 AM
Thanks for the help. Guess I have a legitimate excuse for buying another six pack! I might just have to drink all six to find the perfect sample for the shim. :-)