Ive searched quite a bit and left a comment on another thread on this topic but no one has replied.. All I need to know is how much back spacing do I need? I have a 94 toyota pickup with a 4" lift. I currently have 33's but they are very low on tread and need to be replaced. Im also probably getting new wheels if my current ones are 15x10's. Already picked out flat black crawler wheels in 15x8 with 6 on 5.5 lugs... But I need to know the back spacing. I just don't want any tire rub (my current ones don't).

Also, is there anyway to tell what width rim I have without removing the wheel from the truck? I just injured my back and Can't be doing any lifting/work. Need to heal.

Thank you

 

The ideal backspacing is 3.75"... Shouldn't rub at all

 

Thank you. Exactly what I hoped to hear.

Another quick question. How much better are alloy wheels than steel? Or are they better/worth it?