As for the rear, 120/90/17 is about the same external diameter as a 130/80/17. It rubbed the down side of the air box. Temporarily fixed adjusting rear shock preload, after that a more permanent fix was to fit a monoshock extender, Wichita allowed me to loose the preload again, better for rough roads. Bike ended being about an inch and a half taller; had to extend also the side stand, because it was leaning too much.
I think 140/80 will fit, side clearance, but certainly will rub the air box when going over potholes and such.
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