seat post adaptors ??

[hamster]

I already know the answer to this (since shims are widely used) but I would have thought 4" of ill-fitting seatpost flapping about below the shim could be an issue. . . :?

The seatpost hanging below has no load on it so will be doing nothing.

On shim length, I would certinly want it to run to at least an inch below the tube junction on the seat tube. Konas and others with long seat tube ends above the top tube really should have longer shims to make sure that there is full support through the weak welded area.

 

[J_Westy]

could you not just open out a 27.2 - 29.2mm shim and use that? It'll add 2mm all round bar a small bit

I've never tried that, but I would think it would work.

You might have to cut off the flange at the top so it opens up nicely.

I've used these Cane Creek ones before and they are nice.
http://www.universalcycles.com/shopping/product_details.php?id=27081

USE makes them in a plastic which might open up easier?

http://www.competitivecyclist.com/r...onents/2010-use-seatpost-shim-1138.245.0.html