I know this has been discussed before but I wasn't able to see a straight answer. I want to install the widest tire that would fit on my R80G/S The Metzeler documentation suggests to install the Rear 4.00-18 which is 118mm wide... They also have the 120/80-18 which is 123mm wide and the 140/80-18 which is 142mm wide Anyone was able to fit the 140 on this bike? (I have the stock shock and stock rim). .