Identify rims, and odd tire size?

I have rims like the one in this pic... are they aftermarket? If so, what was the advantage to them?

Also... the tire sizes are 2.75 X 16 and 2.50 X17... the default is 2.50 x 17 for 79 Vespa Grande, isn't it? Will the smaller rear tire lower top end but increase acceleration or does it being 2.75 instead of 2.50 about equal it out?

1159542782_1979vespagrande.jpg

Re: Identify rims, and odd tire size?

came like that from the factory 16" rear with a kind of fat tire, and 17" with a skinnier tire on the front.. There are only so many suppliers of moped parts, so the wheels are made by the same guys, but used on a lot of different brands.

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