alloys

#23
i have 20 inch rims 245/35zr20 (came with them ) and the ride is too hard i want to put 18 inch rims on 235/50r18 but i keep getting asked about rim depth and offset , anybody know what offset i need and rim depth? ( obviously i will be getting new tyres all round to keep the speedo correct etc ) many thanks
Would you be selling tour old
Ones Salem?