29-10-12, 11:24 AM
I have done 40 000 miles on 120 fronts on standard rim and it is far better than the 110. Although the rear can go to the edge there is always decent rubber on the front. No need to go up a rim size to fit the 120. 170 on the rear should be fine but a 180 is overtyred for the bike but that said n0 problems will really happen apart from an odd shaped tyre. The Fazer just doesn't need that rubber and turns better on a 160. Horses for courses though.