My Saffy is lowered 30mm (springs and shocks). When I bought it, I wanted the originaql 15" wheels but it came with 17's. So after sourcing a good setof original 15's, I fitted them only to find that the back box of the Mongoose grounded out every time I booted it, and speed humps were impossible. I contacted several well known Cossie parts dealers to enquire after standard springs and shocks, but the price proved rather prohibative, so a set of DJ 100 17"s were purchased, end of problem, unless I carry 4 adults then it re-occurs.