After more than a decade of ruling the roads with our road proven 440 Series shocks,Weve unveiled another breakthrough design. Dubbed Frequency Sensing Technology FST for its unique ability to dynamically adjust damping as you ride. The result is superior performance no matter the road conditions. A top mount threaded preload adjuster allows for fine tuning with a simple twist of the cap.Frequency Sensing Technology FSTAllows the shocks to sense the frequency of a bump and automatically adjust damping for superior ride qualityDeflective disc valvingAdjust spring preload by hand,no special tool neededProgressive rate spring Standard or heavy duty spring rate and black or chrome finishLifetime Limited Warranty,made in USAAvailable in 11.0 inch to 13.5 inch lengths
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