Join Date: Jul 2005
Location: St. Paul, MN
Bikes: Cannondale CAAD9, Ritchey Breakaway Cross, Nashbar X-frame bike.
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Are you ordering through your LBS? If not, they do have a right to be a little snotty. However, if you are ordering through them, it's really not polite to be "snotty" with you because you won't buy what they want right then.
Your Fuji Ace is a 26.0mm clamp. Nitto bars work off of the "old" clamp diameter standard of 25.4. However, all "mountain" or flatbar stems are still a 25.4mm clamp, and you could replace with that.
I haven't looked at the specs on the Nitto stem, but you may run into an issue there. You have a threadless "aheadset" on your Fuji currently. The Nitto stem may be threaded. This will lead to some greater compatibility issues.
I would recommend going to the Nitto stem right now if compatibility isn't a problem, or switching to a flatbar stem with the appropriate clamp, rather than shimming. I've just never been comfortable using a shim to make something like handlebars fit, when so much of my weight can be on them.
Good night...and good luck