I see the stock roller weights go bad anywhere from 5000km-10000km depending on rider weight, and mostly how you drive the scooter. A lot of high RPM high speed driving will flat-spot the rollers faster than city driving. About your CVT maxing out at 28mph, ask your dealer about de-restriction. It sounds like they did not install the de-restricted boss hence making your variator max out at 30. On a happy A50 I the variator starts to hit high gear at about 35mph and top speed 38-40 indicated and im 200lbs. Make sure that if you Kymco dealer does install the de-restricted boss that they also up-jet the carb so the bike is not running lean at high rpms. One comment about the Agility City 16" we can't get these in the US because Kymco USA won't import them for some reason, if you are lucky enough to have a friend in Taiwan you could send them cash, pay to have it shipped ($$$$$$$) and if you get lucky enough your DMV will let you title it. I've been at a Kymco dealership for over 5 years and still to this day do not understand who is in charge of choosing what bikes get imported to the US. I sometimes browse the Kymco global site but it only makes me sad to see how many awesome scooters and small motorcycles we are missing out on here.