Quote:
Originally Posted by rponmalai
I have a Vex 18T pulley for 5mm HTD timing belts. The pulley thickness is for a 15mm belt.
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You really can't get away with less than 24T 15mm wide on a drive belt. 24T belt-in-tube generally works best in a 3" tall drive tube, though it could probably be made to work in a 2.5" tall tube as well. So going belt in tube generally costs you a little bit of weight.
When doing a gearbox in the back like this rather than the middle, keep in mind that belt connecting the back wheel to the middle wheel will always see the full load of the drive base. So it's extra important to use a properly sized pulley.