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Dirt Bike Mods & Maintenance
Technical Questions on Spring Design
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[QUOTE="JPM, post: 24465, member: 17191"] Cutting the spring in half changes the rate. The rate is inversely proportional to the number of coils. Cutting the spring in half doubles the rate by halving the number of coils. The strength of the spring remains unchanged as it it determined by wire diameter and the spring diameter for a given material. To achieve the same spring rate You could have a spring with more coils and thicker wire wound to the same diameter as another spring with thin wire and fewer coils. The smaller spring would be much lighter and give better dynamic response less mass (F=ma. The larger spring would be less stressed for the same amount of travel but less reactive due to the heavier mass. So it seems that the spring design in a motorcycle is a compromise between strength and response. To throw a spanner in the works we can throw in travel. Am I in the ball park Jer? Something to add for calculating spring rates. What hasn't been mentioned is the end treatment modifying the spring rate. For a typical fork spring the end is squared and ground so the number of coils you use in the equation is n-1. (from memory) [This message has been edited by JPM (edited 01-22-2001).] [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Technical Questions on Spring Design
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