You can contact the Bajaj authorized showroom for the tyre replacement as the newer AS150 comes with tubeless tyres and the rim size stays to be the same 17 inch on both the models. They will suggest you the correct tyre and if possible would replace your tyres with new ones available in their stock. The bike comes with excellent performance statistics and getting tubeless tyres for the same would be a good step for being safe in many emergency conditions. You can search for your nearest dealer at the company website in case you preferred one is has no availability of the tyres.