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RC Glossary


New to the RC Hobbies? What does buggy, bulkhead, nitro mean in radio control car hobbies? Check out the glossary for remote control cars below.

Weight (1) Fluid - WT --

Refers to the relative viscosity (thickness) of shock and diff oils (fluids) as rated on a viscometer. The lower the number, the thinner (lighter) the oil. Shock oil weight is commonly rated in 5's (20WT, 25WT, 30 WT, 35WT, ect.), and diff oil is commonly rated in 1,000's (4,000WT, 5,000WT, 6,000WT, 7,000WT, ect.). Altering shock oil WT is a valuable tuning aid, as long as it is paired with the proper springs. For shocks, a lighter (thinner) WT = faster bound and rebound, while a heavier (thicker) WT = slower bound and rebound. For sealed diffs, a lighter WT diff oil loosens the diff, while a heavier WT tightens it. During long runs, oils tend to 'thin out' due to heat and contamination - if you're looking at a long main, consider running a WT or two of thicker oil to compensate for this. Also note that oils thicken in cold weather, so to stay consistent, you may want to run a WT or two of thinner oil than your summer setting if you are currently wearing a parka.
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