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Message: [QUOTE="plysWfire, post: 1159138, member: 22068"] I'm trying to figure out the correct spring rates for my son's KX250F. I've checked out the Race-Tech spring rate calculator, as well as the on on MX-Tech's website and they both come up with different spring rates. With Race-Tech's calcs, I can stick with the stock rear (5.0) and just throw some softer fork springs in (.42). According to MX-Tech's calculator, I should go with even softer fork springs (.40) and a softer shock spring (4.8). Does anybody know of another calculator so I could go best 2 of 3, or know if of the two calculators tends to be more accurate? Thanks for any help. deano... [/QUOTE]