[109jb]

Thanks for the link. I haven't seen that. Although I don't think the 15 tooth pulley has enough there to bore it out to fit my 8mm shaft. Probably why I choose 20 tooth at the time.

Edit Some of my servo motors have 3/8" or larger shaft diameter. Getting a 4:1 pulley set that fits without spending $$ isn't easy. It costs more for the pulleys than the motor!!!

Yeah. the larger shaft sizes will require larger sprockets. The little RC motor that we have been talking about is a 5mm shaft, so works well for this set of sprockets.