Information needed for our revalving service.

Motion Ratio

This is calculated by the following steps:-
1. Set the chassis on axle stands with the wheels at full droop and off the ground.
2. Remove the springs from the shock absorbers and refit the shocks to the vehicle.
3. Take a datum measurement of the vertical distance from the centre of the wheel to the ground measurement (x).
4. Take a datum measurement from the centre of the lower shock mounting bolt to the centre of top shock mounting bolt measurement (a) (shock open length)..
5. Jack the wheel up till the shock just touches the bumpstop, ensuring not to lift the chassis off the axle stands.
6. Re-measure the distance from the centre of the lower shock mounting bolt to the centre of the top shock mounting bolt measurement (b) (closed length)..
7. Re-measure the vertical distance from the centre of the wheel to the ground measurement (y).
8. Subtract (x) from (y), this is vertical wheel travel (w).
9. Subtract (b) from (a), this is shock travel (s).
10. The motion ratio is (w) divided by (s).

We find this a more accurate way of establishing an average motion ratio than by extrapolating it geometrically.

NB Please ensure all measurements are to the nearest millimetre as the motion ratio is squared as part of the spring and damper calculations.

Rebuild Service

Just like most race car parts, a damper's internals are a consumable item and need to be replaced at regular intervals to maintain its long-term life and maximise its performance.

Although we use the best quality oil available to minimise the effects of wear, it still degrades with increased usage, so regular oil changes are required. The oil seals and O-rings are too of the highest quality but should be replaced with the oil along with the main piston shims, which also lose performance with fatigue and wear.

The oil and valving shims are the fundamental requirements for the creation of damping forces/ resistance and are constantly being cycled with every damper movement. Often, the result of this wear is shown up as having to increase the dampers adjustments as the season progresses.

The importance of damper maintenance and servicing is critical and to get the best performance out of your damper receiving regular check ups is a must. Listed below is exactly what the damper maintenance and servicing includes: