glad2ride said:"their .37's for a 190+ rider are equivalent to most aftermarket .40's."
Uhhhh, .37 does not equal .40. Springs have rates that are measurable. Did you measure the aftermarket springs you have? Which brand did you buy?
.37 Kg/mm rate springs WILL NOT be stiff enough for someone who weighs 190 pounds, even before they put on 15 pounds of riding gear.
If you use a normal amount of preload on the springs, the front end will sag too much. If you use way too much preload, such as the stock amount, the forks will blow through the stroke on any hard hit.
NCFRC said:, we all know that different manufacturer's don't rate them the same.
NCFRC said:I'm just quoting from the Kawasaki spring chart , we all know that different manufacturer's don't rate them the same.
txkawboy said:It has been my experience that yes, often medium-grade/priced springs are not "exact"...I even know that most serious 4T tuners will measure every valve-spring on a mulit-v head, so---??
IndyMX said:There's a difference between verifying a spring length, and saying that a spring rate between two different mfg's that have the same number are actually different..
You're not comparing the same things here.
adam728 said:Springs can easily measure out to a different rate than specified, due to variances in the wire diameter, outer diameter of the winding, quality of the steel (or titanium), etc etc. It's pretty easy for a compression spring to vary +/- 10% in rate from the spec, although I'd hope most suspension spring manufacturers would try to hold it a little tighter than that.
mudpack said:All manufactured items have tolerances, or measurements that fall within an acceptable range for that requirement.
While it may be that a spring on the low end of the tolerance for a .40 might approach another spring (in actual rate) that is on the high end of the tolerance for a .37, to say that a spring rated at .40 from one manufacturer is the same as a .37 from another manufacturer can only be true if one...or both...of those manufacturers is in (gross) error.
Since few manufacturers have the time to actually measure and grade each and every spring they make, it's possible that...on occaison....two springs designed to be two different rates may actually measure (if one were to measure) very close to the same. Instead they make springs that calculations, based on pitch, wire diameter, and material show will produce the desired spring rates.
These springs in that particular batch will show a bell-shaped curve, if/when measured, that places the majority within the tolerance parameters for that requirement.
In other words, chit happens.
IndyMX said:to say that a manufacturer claims that their .37 springs are the same as everyone elses .40 springs as a matter of course, I find a little hard to believe.
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