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I am sure I've done this before with no problems but I thought I'd check.
I have a USE suspension seatpost in the 25.0 size I want to put on my wife's bike which has a 27.2 seat tube.
So I need a shim BUT USE didn't make one as they make a 27.2 post so who would shim a 25.0 post when they could just use the right size in the first place?
I can't find anyone else who is selling a 25-27.2 shim either.
But (and I think this is what I've done before) all I need to do is bridge a 2.2mm diameter difference. So I could buy a 27.2 to 29.4 shim, the same 2.2mm difference, and that would work fine. Admittedly I may need to trim the shim a little where the gap in it is as the metal when sprung in a bit to fit the smaller seat tube might overlap or be too small. But that shouldn't be hard.
Does this all make sense? I am right, aren't I?
I have a USE suspension seatpost in the 25.0 size I want to put on my wife's bike which has a 27.2 seat tube.
So I need a shim BUT USE didn't make one as they make a 27.2 post so who would shim a 25.0 post when they could just use the right size in the first place?
I can't find anyone else who is selling a 25-27.2 shim either.
But (and I think this is what I've done before) all I need to do is bridge a 2.2mm diameter difference. So I could buy a 27.2 to 29.4 shim, the same 2.2mm difference, and that would work fine. Admittedly I may need to trim the shim a little where the gap in it is as the metal when sprung in a bit to fit the smaller seat tube might overlap or be too small. But that shouldn't be hard.
Does this all make sense? I am right, aren't I?
Hasnt there been cases where the Seat tube is wider at the top and narrow further down, so shimming means that the narrower seat post still fits in the seattube whilst still being secure by the shim and clamp? If you follow? 
