i put an a5 on a cobra frame. i'm just trying to run the 5 star mags that came with the puch. right now i have a tomos rear wheel to match the gearing which we had to make a brake mount on the opposite side. we were thinking if it was possible to make the 22 tooth tomos gear work on the bike gear side of the puch rim if we could make that side fixed, especially since i know the chain will line up and i'm already set up for the brake mounted on the opposite side. i was just asking i guess if since 16-40 is the stock ratio on a za-50 if that would work on another engine(the a5) i didn't know if that small engine sprocket would make the engine spin too fast or if it doesn't matter because the 40tooth would still be on the rear