These are quality Malossi Transmission rollers for Vespa GTS and GTV models.
Although standard fitment states the original rollers are 20.9×17 these are 20×17, they fit and work perfect.
We have tried and tested them and they are excellent quality and have no affects what so ever because they are .9 smaller than standard in size.
Standard weight for a GTS 300 is 13.9grms these are a little lighter which make a difference to the acceleration of the engine but its very slight, they make your motor accelerates quicker.
They also fit various other models which we will have listed below soon.
If you require any other GTS parts please contact us as we are now stocking more items due to demand