A while ago I sold my set of concave concept wheels and I regret it so much now that I’ve bought a TT for the roads. I want some wide meaty tyres on the rear but I’m not sure what offset will fit. I have fully adjustable arms and coil overs and I have no problem with rolling and pumping the guards. Question is will I fit 18x11? The options I have for these CC03 wheels are 18x10+0, 18x10+20, 18x11+0 and 18x11+20
Unless you want to widen your guards or run flares, etc your only chance will be the 10" +20. You'll probably need a light pump, you'll definitely need camber & a bit of stretch. You might get a 265 or 275 tyre on there but i tend to think it'll be narrower... The 18x11 +20 will be close to 30mm outside your rear guards, the +0 will be 50mm.
I run 9.5" +38 with 265 and while not super gangsta they're definitely not too sunk so yeah wouldn't go any further than the 10" +20 if you want to run decent width tyres and have the tread blocks on the ground.
I run a 18 x 9.5 +30 rear with 265/35 tyres and this required a guard roll and -1 degree of camber to fit. 10 + 20 can fit but will need "work"