[pattonme]

The BT-90 (now Pro) is a fantastic tire that comes in the 110/120 fronts and 140-160 rears. I love them. It works very nicely on the street too, just take it easy if it's below 40F but I've ridden them below freezing and they behave themselves. I run 28/28-30PSI on the track and I'm a beefy 250lbs.

Running a 150 or 160 isn't going to kill anybody outright even if they are clueless about chassis and suspension dynamics and setup. They might get a surprise though if they were counting on all that extra theoretical 'edge grip'. There really isn't much point going wider since there are perfectly good tires in the 140 size. If you're into the 'phat tire' look for some reason, well, you need counseling. ;-)