Use this calculator for applications where you don’t have the right suspension fluid but have two others available that can be blended to the target viscosity. Useful for increasing or decreasing damping or bath oil viscosity and for voiding your fork’s warranty.

Techie stuff: this calculator uses the Chevron correlation on a volumetric basis instead of the more common mass ratio-based Refutas method, since densities are usually not available for fork fluids. Most oil blending methods, including this one, are based on empirical formulas and will not be 100% accurate in achieving the target viscosity.