120 will fit, HOWEVER, extra traction, although quite cool, is not always what you want. In the olden days, the giant Terra-Flex meats and the 150/80-18 Metzlers were fitted onto the open bikes. Now, those bikes use the 120's AND they put out 15HP more. My 1980 YZ465 put out 42HP. My 91 CR250 put out 42HP. That too used a 110 tire. Food for thought. ------------------ '99 WZ/YR (you choose!) with ALL YZ mods, de-octopused, DSP Doug Henry airbox w/ velocity stack, FMF PowerBomb header, Stroker SX-1 silencer, SS front brake line, forked over by Pro-Action (and then fixed by me), OEM YZ tank, IMS YZ seat, gray wire severed, carb mods by Jim Dean, Andy in OZ, & Sir "Taffy" from Jolly Old England, AMA, NESC, and I use MOBIL 1 Oil, with ZERO problems.