Modern Vespa

Created article FAQ: Is it normal for a GT/GTS to "wobble"?

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One cause of the wobble seems to be a squared off rear tire.

I have a 2007 GT200 with the GTS24 rear and GTS23 front tires, 4069 miles. Over the past 500 miles the wobble has gotten much worse and the rear tire was into the wear bars. Front tire has some wear at the sides, not much in the middle.

After replacing the rear tire with a Zippy 1 the wobble has all but vanished.

One source of wobble may be that when the rear tire is squared off you get a misalignment of the front and rear tires at very small lean angles as the contact point shifts to the corner of the flat.

I have owned 3 GTS300s..2010, 2012 (super), and my new one, a 2014. Unfortunately, I have the wobble. Starts at 30 mph, then slowly seems to fade past 45. It is less noticeable when accelerating fast. Neither of my other 2 GTS300s had a wobble, but they both had the Michelin City Grips front and rear. The new scoot has Sawa tires, so my experience is just the opposite of what some have reported, namely that Sawa tires have fewer wobbles. So far all I've tried is different tire pressure with no improvement. I may just switch over to City Grips and see if that helps.