Join Date: Jul 2005
Bikes: Trek SU200, Trek 7300 FX (Spouse's)
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First try calling your LBS to see if they have them. If not, or if they want a ridiculous amount of money, then make your own, except make it out of metal, not rubber. Head to down to Lowe's, Menard's, or Home Depot, and a good wander around ought to find you what you're looking for. Looks like you'll need something roughly 31.8 - 28.6 = 3.2 mm thick. My first guess would be to look at hose clamps (hack saw off the part which bulges out that you won't need).