Woo tires! 90/90-18 and 110/90-18 Bridgestone Battlax's.

I've been debating about tires for my xs400rj. Does the 110/90 fit perfectly on the back or could a 120/80 do well?

I did a ton of reading here before deciding on that size. I believe it's the stock size for that wheel and it fits really well with the stock front wheel. I'm not really sure if that size will fit, but I'm sure you can find the answer here no problem.