On my dart the front 225 tires are about the limit. Might not be a good comparison- mine are 225/45/17

They work great except when turning into a parking lot with a small bump/curb- if you go too fast (like past a crawl) they rub the trim around 11 o clock (drivers side 'clock')

Mine are on 7"x17" american racing torque thrust IIs stock backspace.

The 255 on the back will be fine- no headaches or troubles.

Good luck!