Originally Posted by
Tim_Iowa
I can't think of how you would safely shim a 1" quill stem to fit 1 1/8". I've never seen such a device.
The ID of a steel 1-1/8 fork like the OP's is exactly the same as the OD of a 1" fork. And, obviously, the ID of a 1" fork is exactly the same as the OD of a 1" stem quill. Therefore, you can make a very good shim by cutting a segment out of an old fork (I made mine from a damaged kids bike) and cutting slots in one end to allow it to expand. The only drawback to this compared to most commercially available shims is that the lack of a lip on the top will allow it to slip inside the 1-1/8" fork during assembly.
Originally Posted by
Tim_Iowa
I've always admired those trek 9x0 lugged frames, but it's good to know that they have a weird headset. I avoid Fishers from the same era because of their 1 1/4" threadless headsets.
It is not really weird - it's exactly the same size as modern 1-1/8" threadless, just with the steerer cut too short to clamp a stem on. However, modern 1-1/8" headsets and replacement forks will drop right in if you ever need to upgrade.