I don't understand why you started this thread since you didn't listen to anyone and got the narrowest freakin tire out there.. FAIL
a 120/80 is for a 125cc
Don't know why you're getting so irate. I read the first 5 or so responses & the size listed in the manual, so I figured a 110 or 120 would be good. Then some other responses said the biggest ones would fit, but I'd already ordered.
I figured all the M5B's are big gnarley tires, and I since I'm riding a few miles of curvy pavement to & from the trails I was worried that getting one too wide might slide out in the curves.
I'll try a wider one next time, which probably won't be too long away.