Originally Posted by Z.Hallett
the EA qoute was dealing w/ motors. but in america the .55mm is about .216654". we normally use a .20" front spring. that would be about a .508mm spring. the .6mm spring you said would be around a .23622" spring in america. that spring is not used nearly as often as your .55mm spring.
You have to tread a bit carefully here. Your conversions are, no doubt, correct on the wire diameter (gauge) but there are other factors that affect the relative "stiffness" of a coil spring. A biggie would be number of coils/pitch. The reason the Associated/Calandra springs have stiffness directly related to wire gauge is that they are all wound the same. A spring wound to a different number of coils over the same free length would not fit so easily within the listing.
Scottrik