taco eater :
Micah Shafer from Mount Pleasant , MI United States
I got the 100mm plates and they are very nice and high quality. I went from 90mm stock to the 100mm on my 1980 Vespa Grande with the proper sized belt from treats. Just a note about my specific model,my new plates did not come with the little lock ring washer hole so i had to drill a small hole so i can reuse my lockwasher. Smooth and slightly quicker launch from stop signs. Pretty simple to install if you know what yer doing. Same diameter for top speed just a slightly better feel on acceleration. Don't expect to pull a ripping wheelie right off the bat though.
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worth every penny
February 7, 2018
taco eater :
Will C from san francisco, CA United States
wow yeah, these are so awesome. they provide linear variation across the whole range. I am currently using the 100mm ones with a euro clutch, CNC steel bell, mild clutch springs and malossi yellow contra.
paired with a polini variator, it's hands down the BEST "bolt and go" solution for variated vespa.
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108mm - They are nicely machined
October 25, 2017
taco eater :
Alan from Washington, DC United States
These are machined very nicely. I did need to clean up the little tabs on the inner cheek a hair.
So there really isn't a belt that fits the 108mm pulley very well. I am using an ax40 now and it works, but it does not use all of the rear pulley.
The front vespa pulley is ~13mm wide at it's lowest. To have a belt that sits on the edge of the rear pulley it needs to be somewhere from 15-17mm wide. With a wider belt, it will not sit flush with the piston pin in the front or whatever the shit they call it. A BX40 fits the rear pulley great, but the front is too narrow.
Idk, you might as well run a 100mm pulley unless you have a way to space the front pulley out.
UPDATE: The belt i found to work best with polini variator is a Dayco 17415. 6 dollars at autozone. I like to think the guys that designed this did that on purpose. It sits in the rear pulley better than the ax40 and has ample tension. Still doesnt ride the edge, but it's closer. The Search continues.
100mm pulley plates upgrade 
108mm - They are nicely machined