My rears are 8.5x17 and et35
I can run 10mm spacer with 235 tyres but on the 245.40 I can only get away with a 5mm spacer.
Im on standard beam though.

When I can afford a 6 degree beam I know I will have to go back to 235.40 or 245.35 and maybe no spacers.

Fronts are 7.5x17 again et35 with 10mm spacer and will be fine once the arch has been trimmed back.

Also bear in mind I am on coilovers and run my car pretty low so if you not lowered much you will have more clearance than me.