QUESTION FIVE: HOW DOES THE SAYBOLT SCALE WORK? This measurement uses a similar viscometer arrangement as used to determine a cSt value, but grades the oil using a much more sensitive viscosity calibration scale. Fork oil weights are derived from the industrial standards used for hydraulic applications, called the Saybolt Seconds Universal (SSU). QUESTION FOUR: IS FORK OIL MEASURED BY THE SAE SCALE? The image above appears to be an edited version of this file The SAE scale follows a very broad viscosity calibration scale. Those weights can be found on a can of motor oil. The Society of Automotive Engineering uses the cSt measurement and converts it to a weight value (30 weight, 40 weight, 50 weight and so on). The rate of flow is expressed in square centimeters per second, or more customary, in centistokes (cSt). It is measured by flowing a specific quantity of the fluid through a capillary tube (called a viscometer). Viscosity is the resistance of fluid to flow. QUESTION THREE: WHAT DOES VISCOSITY MEAN? So, while the fork spring holds the front end up, it's the hydraulics that keep the fork from excessive bottoming or rebounding.
The more restrictive the valving or more viscous (heavier) the fluid, the slower the fork will move. By transferring a quantity of oil from one end of the fork to the other through a series of small orifices or valves, the movement of the fork can be controlled. Your motorcycle uses fluids in motion to resist movement. Hydraulics is a branch of science that deals with the practical applications of fluid in motion. If you want to really amaze friends, you can also call fork oil "hydraulic fluid" or "hydraulic oil." You will find that many of the best fork oils are labeled as a "cartridge fluid," but to our way of thinking that is more of a marketing move than actual fact. Within the industry it's common to use both oil and fluid in the same sentence. QUESTION ONE: IS FORK OIL AN OIL OR A FLUID? MXA's ( ) guide to fork oil will help you understand what that means to you, your bike and any hoped-for win streaks. Instead of helium, air, water or lead, forks use different viscosities of oil. Helium, air, water or lead will change the characteristics of a basketball.įork oil does the same thing to your bike's forks. Depending on what you put in it, it will bounce high, bounce low or not bounce at all. The ball is a sphere to contain and restrict its contents. See how sluggishly it returns? That's compression. Next, fill half of the basketball with water.
See how quick it bounces back? That's rebound.
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