Love my ´05 C50T, just picked it up. But am having some problems with low speed (50-70 kmh) vibration, a front-to-back rocking type of shimmy. I´ve read that if the wheels aren´t properly aligned, that could be the problem. And the bike had new rubber on it when I bought it. Could that be the problem? (I´m taking it to a shop next week, but it would help to know...and keep them honest...if that´s what the cause is.)