i know how to do repair on bikes. its just that the back rim is really bent and i don't have that thing that helps you get them straight. i think its called a truer. also i don't want to replace the back wheel because i don't want to spend any money i don't have to. i worked on it today. and a pedal is broke off. everything works on it it just needs straight rims, tires, tubes, and a pedal and it would be a very reliable bike. shifter and brakes work surprisingly good. also the sprocket is straight and the shifter works perfect.