atm I'm looking at getting some 17x8's but I'm not sure on the offsets to get as they are offered in et30 and et 20.

tyres would be 205/45 i think for abit of stretch. but would arch work or camber shims be needed on the rear if i was to go for et20's on the back?

For what car? Et30 would be better for a newer polo and also you want 205/40/17 not 205/45/17.

thank you to who ever moved this and its on a 9n3 shape. i had a feeeling it was 40 not 45 aswell its been awhile scince i last checked been hectic with work but have alot of time off after this week so wanted to sort out the olop.