Baird,not sure. my 16's with the pirellis are 21.5" tall. i'd guess his are 22-23" tall.
tires make a big difference. my pirellis are basically slicks. the 17's on my honda ct90 have these big ass michelin trail tires, and they're probly 24" or taller. i keep forgetting to measure them.
if you want some crazy tires, look up shinto. i think they make a z rated 17...
How do you know what tire will fit a certain rim?
I use 24" rims should I replace them or can I use them with moped tires?