Gday Cyclone,
I have a few RV125 and now RV90 bikes that I am rebuilding
A lot of OEM Suzuki parts are still available, just search the part No through Alpha-sports web
The genuine Bridgestone tyres are available from the USA:
https://www.smalltires.com/index.cfm/product/search-by-tire-sizeThis company would not ship to Aus so I had the tyres re directed through shipping company, cost me around $550 at my door for 2 sets (4 x RV125 tyres and Aussie dollar was a lot better than now)
I have found Skyteam tyres in Aus that look the same pattern as Bridgestone and DOT approved for the road at around 80 each for the RV90. Both front and back tyres should be 6.7 x 10
Picture of my nearly complete RV90 Street fighter...
The other 2 x RV90 will be original
Tim