What size rear tires for 10.5x19 BBS CH-R rims

[Tommix]

I plan to install M2 competition brakes on my M4. So I also have to upgrade the rims to 20". I have BBS CH-R rims in size 9.0x20 ET28 and 10.5x20 ET35. I'm planning to go 265/30-20 size tires on the front. But which size should I put on the back, 305/30-20 or 305/25-20? I got also KW Variant 3 Club Sport coil over suspension system.

[TractionControlDelete]

Originally Posted by Tommix

I plan to install M2 competition brakes on my M4. So I also have to upgrade the rims to 20". I have BBS CH-R rims in size 9.0x20 ET28 and 10.5x20 ET35. I'm planning to go 265/30-20 size tires on the front. But which size should I put on the back, 305/30-20 or 305/25-20? I got also KW Variant 3 Club Sport coil over suspension system.

For 10.5 rims I liked 295 over the 305 width rubber for better road feel.

If you go 305 then stick with 305/25 as it looks better with the 265/30 up front

[M3SQRD]

Agree with TractionControlDelete recommendations. 295 is a better fit on a 10.5” wide rim. A 305 really needs an 11” wide rim. F 265/30 with R 295/30 or F 265/30 with R 305/25 will be the best combinations.