So we want to use 8" pneumatic tires for our drivetrain, and we currently have the KOP chassis and its provided Toughbox Mini gearbox. AndyMark has a conversion kit, but it is out-of-stock until Wednesday as key parts are not available: tires, tubes, timing belts, and extended hex output shaft for the Toughbox Mini gearbox.
I can source the pneumatic tires and tubes locally, and the timing belts are available elsewhere--but not the output shaft. Given time pressure, I am looking at the WCP single speed, double reduction gearbox at
http://www.wcproducts.net/single-spe...uction-gearbox. It looks like the output shaft *might* be long enough. I'm thinking about replacing the Toughbox Mini gearboxes with the WCP gearboxes. Has anyone mated this WCP gearbox to an AndyMark chassis? Any other suggestions for a KOP-compatible gearbox with single-speed double-reduction in the neighborhood of 9:1 - 10:1 and a long hex output shaft?
Sometimes students ask me if MIT wants students who are well-rounded. I usually say I don't care as much if you're well-rounded or pointy, what I care about is evaluating the space enclosed by the shape. - Petey [more] 
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