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Old 11-17-12, 08:18 PM   #1
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Anyone make a 31 or 31.1 mm seatpost?

Some time ago, I bought a used Giant full suspension MTB. The guy cut the original seatpost too short for me, so I needed a new one. The post was some weird size, either 31 or 31.1 mm. Closest I could find was a 30.9. (Isn't that the standard?) Needless to say this kept on sliding down as I rode. I stuck a small strip of metal between the post and frame -- yeah, I know you're not supposed to do that! -- but it still slowly creeps down (about 5 mm every couple hours). I checked eBay and Giant's web site, to no avail. Anyone know if I can find one somewhere? Or anyway to fix it? (Its amazing how hard it is to slide the post up and down with that homemade "shim" in it, and how hard I tighten up the clamp -- surprised it hasn't broke yet -- yet it STILL slides down!)
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Old 11-17-12, 08:37 PM   #2
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pop can shim.


also, rough up the outside of the post to give more friction.
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Old 11-17-12, 10:29 PM   #3
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Depending on the year and model, Giants were either 27.2, 30.8, or 30.9. Kind of sounds like there's something wrong with the seat tube on the frame.
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Old 11-19-12, 07:48 AM   #4
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Might cost more than your bike, but any size up to 32...
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