hi on my 1980 gs1000e,,, it has mags,,, and on the rear i put a 130Hx17 bridgestone battleaxe,,, went on like a dream,,,on the front i put a bridgestone 100/90V x19 but i didn,t clean the bead on the mag like i should have,,anyway after stuffing aroundand then taking the tyre off again ,,the bead was grubby,,, so this time i wire brushed itand then lightly wiped it with800 grit wet and dry ,,,lightly then wwiped it all over to clean them up put the tyre on again .... used some gunky clothes washing liquid and slopped it around the beading and a little on the tyre and bingo it popped all over the bead and its never gone down since ,,, i did them myself ,,,because the rip off bike shop in horsham,,,, the only mob there,,, wanted $100 bucks to fit my tyre when he had a chance,,,, so now i do them myself... regards oldbiker