The /100 is the springs rate in Newton meters, but without the decimal. In this case a -34 is a 100nm or 10.19kg or 571lb spring. For some unknown reason Ohlins uses it’s own numbers to label rate, but below on the rate conversion chart you can cross reference this number. Determining what these numbers mean on ohlins shock (21040-31/95. Follow the mini charts below and you'll be able to use the larger chart to determine what spring rate is recommended for your weight. There is a margin of 25 pounds between each spring for each weight given. At least for models YA638/788 according to the Ohlins spring rate chart. ![]() ![]() Almost all Ohlins springs have a diameter of 57mm so that’s easy, the 1091 in this case means it has a 160mm length (when not on the shock) The -34 is the spring rate. A Free spring length B Installed spring length Shock absorber fully extended A - B = Spring Preload Set the spring preload Hydraulic spring preload adjuster Turn the hexagon screw or the knob on the hydraulic adjuster to set the spring preload. The spring preload is the difference between the free spring length and the installed spring length.
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