front tyre

100 80 18 v rated is standard but will a 110 80 18 be ok ? what can go on the back? is 140 the max width tyre? was looking at a bridgestaone 140 80 17 for the back

I have had a 110 in front, it was OK. A Norwegian fellow uses that size in front, and 150/70/17 in rear, and he said that it is good to drive. He uses Michelin Pilot road 2:s, and that setup will be my next choise.