First ride almost complete success.

That's a nice looking bike. There's a lot going on, but it still looks clean. It reminds me of a zipcycle with that crotch-positioned lever sticking up. Looking at that large vari-pulley, I think I might have one of those in the basement. I plan on using the Mac on another bike eventually. I'm kinda doing a test platform now. I'll keep this stuff in mind on the new build.

We do have a NAPA in town. The guy there is useless, though. Without a car make/model or part#, he can't/won't look for anything. AutoZone seemed much better at using the computer to search for parts (belts, pulleys, etc) based on size and type.

3/8 would probably work better with the smaller drive pulley. They can be had in super flex too(the belt with all the notches).

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I agree. For this temporary build I'll use what I got, which is mostly 1/2" belts and pulleys and everything goes on 5/8 shaft. I have some 1/2" shaft stuff, including this thing that that I garbage picked years ago, and forgot until you reminded me.

Thanks