Anyone know of any (27.2 to 30.9)? Not really wanting the USE plastic or similar and all I can find are 100mm max regardless. I know this is generally the amount left at max extension but I've always liked a bit more post inserted for the frames sake so would prefer as long as possible. Found this one in Germany but a bit £££ with shipping:
https://www.rosebikes.com/product/detail/aid:2698725
Anyone? - or presuming there are no longer (UK) options around?
The inside of the seatpost is often butted, so beyond a point it's not 30.9mm anymore. So even without a shim it's doubtful the seatpost is completely in contact with the seatube past that point anyway.
The big advantage of plastic shims is they don't corrode and stick to the frame/seatpost, I've never had a problem with USE shims moving, or creaking or anything (and I'm 15st in my shreddies, my frame has a reputation for cracking at the seatstay/seatube junction and I'm not light on it so I really should be able to break it if it was an issue).
I once put some bubble wrap down my seat tube and used 3 shims.
The bubble was to stop the shims falling off the bottom of the post. It seemed to work.
I obviously cut the lip bit of the shim off.
The one I bought was 14cm long. Let me try and find out where I got it from.
I just bought two, then cut the lip off one and stuck it to the bottom of the post. Seems to work ok. That's with a dropper though, it's not going up and down all the time.
Cheers guys - thanks molgrips - shame they only do the one diameter (not mine!).