I have not experienced any rub issues in 3,000 miles, and I have taken the bike to 105 a time or two.
Doing the math, the 120/70-18 is actually 8mm smaller in outside diameter than the 110/80-18. The only way there could be rub would be if the inner brace was damaged or bent prior, or if the tires were inflated rediculously high, OR if the wrong speed rated tires (i.e. OEM Nighthawk 750 front - K505) were mounted and were run at speeds above what they were designed for.
120 (width) x .70 (aspect ratio) = 84mm (sidewall height) x 2 (plus the rim) - For total outside circumference
110 (width) x .80 (aspect ratio) = 88mm (sidewall height) x 2 (plus the rim)
So, if my math is correct, if the 110 doesn't rub, the 120 never will. Plus, the 205's are ZR rated, which means they are designed for speeds that not even the 1300 is capable of reaching and will not swell more than 1/8" at full-tilt. I have talked with tire reps. at great length while building bikes in order to ascertain proper fender spacing to prevent rub, and they all have told me 1/8" is the max a ZR tire will swell. That's why you see these fat tire customs with the fender 1/4" off the tire. Most guys wrap the tire with fuel tubing for spacing during fab.
As far as different part nos. for the F. rim, isn't that because of the pickup for the ABS vesus the non-ABS not having a pickup? That was my understanding, but I may be wrong.
Doing the math, the 120/70-18 is actually 8mm smaller in outside diameter than the 110/80-18. The only way there could be rub would be if the inner brace was damaged or bent prior, or if the tires were inflated rediculously high, OR if the wrong speed rated tires (i.e. OEM Nighthawk 750 front - K505) were mounted and were run at speeds above what they were designed for.
120 (width) x .70 (aspect ratio) = 84mm (sidewall height) x 2 (plus the rim) - For total outside circumference
110 (width) x .80 (aspect ratio) = 88mm (sidewall height) x 2 (plus the rim)
So, if my math is correct, if the 110 doesn't rub, the 120 never will. Plus, the 205's are ZR rated, which means they are designed for speeds that not even the 1300 is capable of reaching and will not swell more than 1/8" at full-tilt. I have talked with tire reps. at great length while building bikes in order to ascertain proper fender spacing to prevent rub, and they all have told me 1/8" is the max a ZR tire will swell. That's why you see these fat tire customs with the fender 1/4" off the tire. Most guys wrap the tire with fuel tubing for spacing during fab.
As far as different part nos. for the F. rim, isn't that because of the pickup for the ABS vesus the non-ABS not having a pickup? That was my understanding, but I may be wrong.