it probably is a good idea to keep the same height tire on the front and back, just to keep the geometry the same, but it wont hurt anything to mix them. as long as they're both bias-ply or both radial (which I don't know of any that fit our stock rims) just dont mix bias-ply and radial on the same bike. anywho, with a 100/90-16 it's not surprising there's not rubbing on the fender. they only rub when you go to a 110/90-16.
I would suggest Bridgestone BT45 (100/90-16 front, 130/90-16 rear) tires. That's what I use. plenty of grip all the way to the edge, good rain response, and good mileage. I put mine on at 9k something and am about to turn 14k and I still have plenty of tread on both tires
PS what make/model tire does the bike have on front?
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