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Start in the middle, and increase or decrease as necessary. Oil Tuning Changing the HydraCoil oil in your Judy fork will alter its rebound characteristics. Rebound is the extension or return of your fork. To slow the rebound of your fork, replace the stock 5 wt. oil in your fork with a heavier weight oil (10 or 15 wt.). For further information on oil volumes and adding oil to your fork, visit our website at or contact your RockShox local dealer or distributor. To change the travel of your for