Seat post shims, real world data?

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Seat post shims, real world data?
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flag half-man-half-scab
O+
Posted: Mar 9, 2016 at 9:25 Quote
Considering switching up frames, but don't want to give up my dropper. I'd be moving 30.9 -> 31.6.

I was thinking of using a shim, but wanted to get some opinions. It would be on a Transition, so overbuilt alloy.
flag RunsWithScissors
Posted: Mar 10, 2016 at 6:37 Quote
Can't speak for everyone, but I've never had a problem with using seatpost shims. One of my bikes has had a beer can shim in it for well over a year now with no problems.
flag Pablo16v
Posted: Mar 10, 2016 at 8:00 Quote
I’ve been using a 31.6-30.9 shim for nearly 4 years, with a Reverb, and no problems here either.
flag captaingrumpy
O+
Posted: Mar 11, 2016 at 10:54 Quote
Apologies if this is obvious but: make sure the shim covers the full area where post contacts the inside of seat tube. Leverage is a bitch.
flag lazyname
Posted: Mar 11, 2016 at 12:07 Quote
Agreed. I bought a shim once for 27.2 to 30.9 and it was quite a bit shorter than my minimum insertion (wtf?). Its okay I was using it on a rental from the store I bought the shim from in the Yukon.

I'm using a 30.9 to 31.6mm. Its work fine, if you are not moving your seatpost up and down. I only have a 4" KS E10 on this bike, and I sometimes slam my post for an extra 2 inches. The shim likes to stick to my post instead of the frame.
flag half-man-half-scab
O+
Posted: Mar 11, 2016 at 14:30 Quote
thanks for the input, guys
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