HELP Wheel size for Circuit Flares?
 

As I know. The front flares is 45mm and the rear one is 75mm. I plan to buy RPF1 17*10 +30 all around plus spacers on the rear wheels. Will this setup fit?thank you guys. I’m new to this. I really don’t know.

There are people who have fit 315/30-18 in the front and 315/30 or 335/30-18 in the rear. Those tires will be high-performance/track oriented (Yoko A052 or R888R) Others have 285/30-18 or 295/30-18 square available in a high-performance street (Conti ExtremeContact, Bridgestone RE71r and S007A, Dunlop ZIII, Yoko A052) track oriented tires.. Those are obviously on wider rims and 18" diameter rims. The tire selection in 17" diameter is limited these days.

If the seller doesn't have specific info, you may want to get a rim (any rim), remove the shock, and move it through the range of travel and steering movement to determine the clearance to the flairs and inner fenders. Also, you may want to be sure the new wheels will clear whatever brake caliper you may consider in the future.