Adam, the 6 lug 15x8 rally wheels were optional on all 1/2 ton 73-87 4x4 pickups & 73-91 Blazer, Jimmy & suburban.
235/75/15 is the correct size for those wheels, that's what they came with from the factory. some of the Blazers came with 31/10.5/15 also.
My 87 pickup came with the 235's. You can always go bigger if you dont like them. Iv'e had tires as big as 33/12.5/15 mounted on them on other trucks.
Last edited by JeffL; 07/16/2009 2:57 AM.