What's the widest tire you can run on pony rims?

245 50 16

I had 245 50 16 on my 1988. Did not like the lateral movement from side to side which affected handling. I bought 225/55 16 BF goodrich and no side to side movement.
I do not have enough grab from a stop or in lower gears.

I should go to 17" with 265 rear and 235 fronts.

I do not go to drag race, if I did would buy drag radials for and wider rims.