I had them on my mach Z last year inside the track where my studs were and no prolems with 2000 miles they do get roughed up a little more, as far as buying them from mountain machines i would stay away from them, it took me almost 5 months to get mine, and on top pf that they sent me someone elses order. luckily it was the same style that i ordered. then i waited another month for the rest of my order. this year i went with tricked toys had them in two weeks. good people to deal with.