dam-13b

hey guys new to the forum just wondering im looking at a set of rims for my fg 2013 xr6 turbo ute the wheels are 20 x 9.5 +35et tyres can be either 20 x 35P x 275 OR 20 x 35P x 255 My question is a. will the rims fit and how much will they fill out the guards or will I have to do suspension work or roll guards b.what tyre size should I choose ?? Thanks in advance jayden