The friction force in the clutch works just like the blocks in the frication section of brake, except that the spring presses on the clutch plate instead of weight pressing the block into the ground.
The large diameter super wide quality rubber wheel makes the user's ground effectively protected, and increases the friction of the brake.
大直径超宽优质橡胶车轮使得用户地面得到有效保护的同时，增大了制动的摩擦力。
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Large diameter ultra wide quality rubber wheel allows the user to obtain the effective protection of the ground at the same time, the lift increases the brake friction.