nah i dunno then im thinkin 17's and slammin it bigtime 17's fill the arches good and it means i will be able to save 200 quid on archwork and 350 on the wheel that gives me 550 to spend on summit else. What u reckon is the lowest u can go before speed ramps piss u off because u cant get over them???? Thinkin bout 40mm springs but cant find any springs that take it lower