Motorcycle Shock Rebound Valve Stop Washers

Your rear shock absorber has a thick metal disc with machined passages flowing between both flat sides.

Stacked on both sides of this piston are the valving shims, a complex collection of thin steel washers that flex when pushed by oil pressure. When the coilover compresses, oil flexes the compression shims open & pushes through the piston holes to the other side, creating friction & heat. If the damper is pushed harder, it flexes further, allowing more fluid through. After a bump, the coil spring pushes the bike back to ride height so oil is squeezed back through the piston & rebound shims to the other side, absorbing more energy.

You don't want the shims flexing too far though - or there'd be very little resistance - so these thick stop washers help set a minimum damping level by limiting flex distance.

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Teknik Rebound Stop Washer
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