Got my 50 2 days ago and got a flat , So i pulled my back wheel off, Now how do i get the tire off the rim? and how hard is it to service the rear brake? My back brake seems weak.

 

get yourself some tire irons and use alittle dish soap when putting it back on....rear brake is nothing more than the nut at the rear right hub the more you turn it clockwise the harder the brake will hit...put the bike up on a stand spin the wheel and keep adjust til it's right at the stopping point with little pressure on the brake lever ...if it rubs back it off a turn or two ...that's about all the service you'll need for awhile........