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ASK THE MXPERTS: WHAT'S WITH NEWTON METERS? WHY CAN'T WE STICK WITH ONE SYSTEM OF MEASURING SPRINGS?|Motocross Action Magazine

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Dear MXA,
What is the deal with Newton meters? I ordered stiffer 0.49 kg/mm fork springs for my bike, but the dealer told me that my bike came stock with 4.8 N/m springs. What’s the difference?

Every manufacturer is switching to N/m (Newton meters) just to mess with its customers. We’ve gone from pounds to kilograms to Newtons for no rhyme or reason. Luckily, the difference between a Newton number and a kilogram is not very great. The correction factor is to multiply the Newton number by 0.102 (and move the decimal point).

Honda gave up on air forks, thanks in no small part to consumer complaints.

Thus, a 4.8 N/m fork spring is a 0.49 kg/mm spring. As a quick rule of thumb, the Newton meter number can be extrapolated to be one rate stiffer in kilograms, thus a 4.5 N/m spring would be a 0.46 kg/mm spring.

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