Thanks, I'm not planning on machining down the shaft. I have a spare swing arm and want to cut the notches for a 300 tire while it is off the bike. If I know the shaft size, I can run a round bar through the center of the tube and make the notch to clear the driveshaft without having to do it while the swing arm is on the bike.
It looks like the shaft is about 3/4" diameter,from the picture.
Webb09 , when you have time do a search
for posts by " Dam Guy " some good reading about
this exact same subject you are looking for. threads names :
" 300 tire and rims showed up"
" NO GEARS AT ALL "
" 10 Inch rim 300 tire "
" side play in swing arm "
I know .....but I don't know how to post links to other threads :redfaced: