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Message: [QUOTE="James Dean, post: 24449, member: 18501"] Burt is right, G is modulus of rigidity not the "Elastic Modulus - E". yzguy15, Here is an example of a shock spring calculation: ------------------ G = 11400000 psi d = .451 in n = 7 1/8 coils (9 1/8 coils but the ends are ground flat making them rigid 9 1/8 - 2 = 7 1/8) D = 2.94 in K = 11400000 x (.451)**4 / (8 x 7.125 x (2.94)**3) K = 325 lb/in ------------------- Fork spring: d = .189 in n = 46 active coils (48 - 2 = 46) D = 1.26 in K = 20 lb/in ---------------- ( These examples were both mid-eighties Honda springs from past bikes. ) James Dean [/QUOTE]