Have a quick question about new tires. I am getting ready to get new tires for the bike and was looking at the specs for tire size on my bike and the front size is MT90-B16 and the rear is MT85-B16. Now with that is it alright to put an MT90-B16 on the rear or is there that much difference between a MT85 and a MT90. Just wanted to know before I bought the tires online. Thanks for the help.