I have two china quads, on both i have issues with flat tyres, the tyres are cheap and where they join fails on the rear. They are ridden by my wife and 8 & 12 yr old girls so they aren't trashed. Other than that, keep a check on chains and rear axel alingment. For the record mine are 110cc semi auto & 90cc with no gears, just twist and go.. May or may not pertain to bigger quads but they are all chinese so i'm guessing it's something to ask the salesperson? None of the tyres were covered by the 'warranty' (walk away warranty, walk away and your warranty expires....)
