I posted this on another thread of what i have experienced trying different variety of rim sizes.
On the 66 backspace is very important as there is not much room for error and may need different BS front and back to clear components depending on brake/hub/suspension setup.
16"/17" x 7" 4.25-4.5 bs 225 x 45 or maybe 50 is the safest route but with 8" you will need at least 4.75 bs however if you go 16"and smaller with big backspace on the front you risk interference on the upper ball joint and tie rod end.
My Foose rims are 17x8.5 4.5 bs 235 x 45 and they were too wide front and back and will scrub the front fender, but i have RRS suspension on the front and the disc brake on rear which also pushes it out approx 5mm.
The rims in my avatar are 18x8.5 with 5" bs i think by a quick measurement and 225x40 tyres, i could go 235 comfortably, 4.75 should be right on std setups
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