To the OP. I'm happy to hear you are teaching this at the Bike kitchen. I'm a former volunteer at SBK. I'll be sure to take that class. Are you going to require that everyone have the same caliper? I already have a dial caliper that I could bring.
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I'm not one for fawning over bicycles, but I do believe that our bikes communicate with us, and what this bike is saying is, "You're an idiot." BikeSnobNYC