coaster

ok so this is my second build totally addicted but im running a 700c x 38 tires with a 142f stock engine my brakes are U-brakes and they suck it stops the bike but slowly i just ordered a 700c coaster wheel is my tires safe with this brake dont wanna pop on road from burning rubber .duh.

How do I get the sprocket on my bike with coaster brakes without messing up the arm?

im tired of my crappy stock coaster brake wheel that came with my cranbrook anyone know where i can get the Hd wheel and not just the hub?:-||