4" portals require a minimum of 14"+ wheels
6" require 18"+ wheels
8" require 22"+ wheels.
- Wheel offsets may be different depending on the machine you're putting them on. Normally anything 4-3 or 5-2 should be ok.
My 14 inch wheels rubbed the caliper with 4 inch portals! Shaved a little off the high spots of the castings to fit but still pretty tight...if I did it again I'd go 16s for extra clearance!