what is this spring that measures 60-220? i just but in the speedwerx blue with 52.9 gram speedwerx weights and a 35-50 helix. i ride at 4-12K feet.Th clutch springs are rated at how many pounds it takes when it is installed and then how many pounds at whatever the height is at full shift.
The XX compresses the primary spring to 2.5" when you install it and full shift is at about 1.4".
The manufacturers rate at all different heights so it is really hard to get an accurate number. Common ratings are 2.7-1.7, 2.5-1.5, 2 9/16-1 5/16, and several others.
I have been measuring at 2.5 and 1.5 just to get a baseline.
Here's some of my results
Speedwerx Blue stripe rated at 80-190 measures 72-154
Venom black/red/white rated at 92-190 measures 70-158
My stock spring was rated 96-225 and it measured 72-146
And then a few Arctic Cat snowmobile springs
60-220 measured 92-260
85-235 measured 106-250
and a few others
As you can see the XX is different that everything. It's a pain in the ass to get it right.
I just got a spring that is 35-195 and it measures 60-220. I'm pretty excited about this spring. Low engagement is awesome and the top end should be a lot closer to where we want it.