This is something best carried out by an expert. The dynamic viscosity of single viscosity winter oils is determined at a various cold temperature as established by SAE J300. Single viscosity oils are normally referred to straight weight oils. These numbers are usually defined as oil weights. If you feel that your shock absorber performance is deteriorating or that they are becoming squeaky, it is time to change your fork oil. The eleven viscosity grades are: 60, 50, 40, 30, 20, 25W. The front forks of a bike are filled with fork oil to absorb the shock of riding over uneven surfaces.īike fork oil is protected from outside factors and contaminants by sitting within an enclosed chamber so fork oil can go for a long time without needing to be changed. Why such a wide range and what is the difference When you hit a bump in the road with lower rated weight fork oil you will feel more topping out which is when the shock recoils back to the original position. Fork oil weight ranges from 5 to 50 weight. They absorb the front end load of a bike as it encounters an uneven terrain. Off the factory floor most all Harley’s have type E fork oil (eight weight). Motorcycle forks are the front two shock absorbers of a motorbike beyond the pistons and springs. The chances are that we might not even have heard of motorcycle fork oil and yet it plays a crucial role in delivering a comfortable ride. When we think about motorbikes and motorbike maintenance we automatically think about engines and brakes and the fluids that keep them performing.
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