Similarly to wheels slipping, wheels binding is often caused by the opposite issue. Broken Gears, lack of grease and -in some cases- gearbox covers can cause the transmission to bind. To check test to see if your transmission has broken gears that could be causing the wheels to stick, elevate the drive wheel and turn it by hand. If you hear any noises or rattling from your transmission this is a strong indication that your gears may be broken and need to be replaced.