seems tire questions are a no go.
Anyway, here is an idea...not sure if the label "scooter" matters or not.
It comes in a 140/70/17
https://www.canadasmotorcycle.ca/heidenau-k66-4-season-scooter-tire.html?gclid=Cj0KEQjw4pO7BRDl9ePazKzr1LYBEiQAHLJdR04ZiPRI0qgkGGAbuak6eSesQnGmkSYXYoBbp3eJHdUaApKH8P8HAQ#521=8491
Would also like to know if the front will take a 120/70/17.