nothings legal here in ny,but i am in upstate ny(redneck farm country) and i have a bike with engine,i may be the only one with a real engine kit(something besides a weedwacker or chainsaw engine).you can get dot aproved tires,buy motorcycle or moped ones and put on bike,they fit if you get the right size or just get the whole wheel.
does everyone know that you can take a moped frame with reg and put bicycle wheels,handlebars,seat,peddals,and your engine kit and it would be legal,because mopeds only need to be registered$50 no insurance or inspection.