Dark Blue 180-310 lbs +1400 Engagement Black/Blue 160-270 lbs +1200 Engagement Silver/Black 140-210 lbs +1000 Engagement Black/Pink 103-209 lbs +500 Engagement with higher RPM at High MPH Silver/Blue 100-190 lbs +500 Engagement Silver/Black/White 35-212 lbs Standard Engagement around 2000 RPM on Ramp Side A ( ramp side R is typically about 1000-1200 RPM higher than a for all springs but will vary with arm weight configurations)
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