tire size on a 9 inch rim

[BlueFBird]

whats the widest i can go on a 9 inch rim, with it still bein safe? right now i have 255/40/17

[Little G]

285/40/17 but most go with 275/40/17 since it's a more popular and thus cheaper size

[BlueFBird]

i think ill go with the 285 im lookin to get a new set for the rear... thanks little g