What I'm trying to accomplish is to use two stems - one to hold my road drops w/ front brake, and one to hold my track drops without brake, so I can switch the whole stem/bar combo to go from street to track setup.
Unfortunatly, I ended up with two stems with a bit of a different stack height. My question is whether you think its possible to cut the steerer tube to a length that would work for both stems. The steerer tube is 1" unthreaded, and I've got a shim on there for 1-1/8 stems.
The road bar stem - the current height works fine for these bars - plenty of gap to get preload without hitting, and it doesn't seem to have any problems.
Track bar stem - as you can see, the stack height is shorter, and this stem sits with the steerer/shim just about flush - no good.
Spacer stack and shim on sterrer tube shot for good measure.
Do you think it would be workable to cut a little bit more off the stem and shim so that its just enough of a gap for the shorter stem, and more than ideal for the taller? Or would that be too much of a gap and cause problems? Seems to me like the main drawback of having too much of a gap is that the stem will be clamping onto less of the steerer tube, though I'd think that it would have enough to have a plenty positive connection for the needs of a stem.
Of course, the alternative is to use an additional spacer - I assume the ones I have on there are 1" spacers, as they seem to fit well on the tube, and won't fit over the shim. I'd need a true 1-1/8" spacer that would sit over the shim and hopefully the 1" stack has enough of a lip for it to sit on.
Ideally I'd like to just be able to swap the stems without keeping track of an extra loose spacer when it's not in use.
I asked at an LBS that seems to do good work, and they said they'd recommend just using the extra spacer, which I decided not to buy since I had a couple extra - of course only to come home and realize that the spacers I have are clearly not going to work.
Cut the stem shorter? Get a proper 1-1/8" spacer and quit whining? Cut the shim and use an extra 1" spacer below shim for the short stem, leaving the shim "floating" on the taller one?
Any advice is greatly appreciated.