Originally Posted by
smd4
Yes, it is. On anything other than a kid's bike. It's a shortcut, pure and simple.
On a new, relatively expensive bike, I’d tend to agree but for someone rehabbing a classic / vintage bike that has suffered some level of abuse, misuse or disuse and needs a replacement seat post to bring it back to its former glory, using a shim would, IMHO & perhaps that of others, be completely acceptable. Restoration to museum quality would be an exception.