*Pneumatic back tilting post, vertical and horizontal arm can be locked pneumatically for one time. *Larger and Thicker turntable, dismounting 11" -24" rim and max. Tlre diameter 1200mm *Taller vertical arm, dismounting max. Tire width 330mm *40A reverse switch, silver point, which can bear more load and work for a long time. *The hexangular shaft made of S41, which can avoid the distortion and error when operate the 11 - 24" stiff tire. *Foot pedal is made of high quality steel material which can work for a long time. *Clamp is made of fine alloy steel, processed with high-precision, wearable. *Equipped with left aid arm, pressing positions and tire support plate, more convenient Operation *Powerful ∮ 100 cylinder.