I found an Avon Spartan Scooter tyre at a dealer, size 3.00 X 10. The pattern is okay since it is unused. The rubber, is, a bit hard. Won't try it on any of my scooters. I got it for free, so no loss on my part.
And I'm pretty sure I won't get 23% more grip. I wonder of CLING is different from Spartan?
Avon started 1904 in England but are now owned by the american company Cooper.
I also have updated my post "The Abandoned Vespa PK S" with a new picture!