The bigger the difference in viscosity from the original oil, the more turns/clicks would need the adjuster. TABLE 1 SAE J300 Viscosity Grades for Engine Lubricants (1) SAE Viscosity Grade Max. This doesn’t means that suspension behaves exactly the same as with 14,14cst oil, but slow speed behaviour is similar. Youll see the ranges for cSt compared to SAE numbers. Turn the external adjusters 1 click/1/8turn anti-clockwise. The table at the right, SAE Viscosity Chart (High Temp), shows the equivalents for cSt and SAE viscosity numbers. This means that all damping (compression and rebound) will be slower, in general. Couldn’t find nothing else than a 15.3cst oil. As with the range of viscosities among the majors at 100 C, there is a relatively tight range as to where the viscosities 40C falls. Beyond that, the damping behaviour is quite different.Ī change on oil’s viscosity could need a new damping adjuster (low speed adjusters COMP/TEN) set-up. As shown in the graph below, the average viscosity for the 5W-30 major brands tested is 61.1 cSt 40C. If you can’t find the same viscosity as your original oil has, choose one with a difference of +/- 5cst. To assign non-winter grades, kinematic viscosity is graded by measuring the time it takes for a standard amount of oil at a temperature of 100 C (212 F) to flow through a standard orifice, in units of mm 2 /s (millimetre squared per second) or the equivalent older non-SI units, centistokes (abbreviated cSt). SAE range is only shown for your reference. Therefore, it is important to remember that the viscosity of a fluid (resistance offered by a liquid to flow) has nothing to do with its density (mass per unit volume).Ĭheck the next video to learn more about the importance of visosity (and suscribe to our channel!)īelow you can find a equivalence suspension oil chart (both for motorcycle and bicycle) where you can easily choose the closest oil to the original one. Gear oil SAE 85W-140: Mineral based multigrade gear oil: Property: Value in metric unit: Value in US unit: Density at 60☏ (15.6☌) 0.901 10³ : kg/m³ : 56.2 : lb/ft³ : Kinematic viscosity at 104☏ (40☌) 411 : cSt : 411 : cSt : Kinematic viscosity at 212☏ (100☌) 30.3 : cSt : 30.3 : cSt : Viscosity index : 103 : 103 : Brookfield. The greater the number, the more stable the viscosity is against temperature changes. Viscosity index indicates the “quality” of the oil. The viscosity is measured in centistokes (cSt) or mm2/s at 40✬ as a reference temperature and is a technical characteristic of each oil. You can also look up for it on internet forums, although it may take longer.
100 cst viscosity equivalents sae manual#
You can look up for the original oil specs in the workshop manual or by asking to an official dealer.
In case you can’t find the original oil, use the one with the closest kinematic viscosity. We recommend using the original oil on your suspensions so that the damping behavior is not changed. Here’s a really nerdy table that uses the much tighter Centistoke (Cst) testing scale, so we can compare brands with accuracy.Want to learn more? Get our Motorcycle Geometry and Suspension Adjustment e-book! General recommendations But, due to the international SAE standard being so loose, one oil company’s 5Wt can be the same viscosity as another’s 7.5Wt.
So what oil should you use in your suspension? Most suspension units use approximately a 5Wt (SAE). Buying the right oil for your bike is very important as it can effect performance and the amount of wear-and-tear your bike receives.
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