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Progressive Suspension 444 Series FST Shocks For Harley Switchback
After more than a decade of ruling the roads with the road proven shocks, Progressive Suspension 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 (FST) allows the shocks to sense the frequency of a bump and automatically adjust damping for superior ride quality
- Adjust spring pre-load by hand - no special tool needed
- Progressive-rate spring
- Deflective disc valving
- Sold as a pair
- Made in USA
- Shock lengths are measured fully extended, eyelet to eyelet on centers
- A change in height at one end of the bike may require a change at the other
- Changing ride height can potentially change the trail and mechanical trail
- Prior to purchasing shocks that are different than your OEM length, please verify that wheel and suspension travel can be altered without causing clearance issues to the swingarm, axle, frame, tire, fender, chain/belt and guard, and exhaust
|Product Style||RevZilla Item #||MFR. Product #||Availability|
|Product Style Standard 12" / Black||RevZilla Item #899840||MFR. Product #444-4072B||AvailabilityOut of Stock|
|Product Style Standard 12" / Chrome||RevZilla Item #899841||MFR. Product #444-4072C||AvailabilityAvailable: Requires 3-5 business days of lead time prior to shipment|
This Product Fits
This item is also available for 72 different bikes. View All Models
- Harley Davidson
- Dyna Convertible FXDS 1994-2000
- Dyna Fat Bob FXDF 2008-2017
- Dyna Glide Custom FXDC 1992
- Dyna Glide Daytona FXDB-D 1992
- Dyna Glide Sturgis FXDB-S 1991
- Dyna Low Rider FXDL/I 1993-2017
- Dyna Low Rider S FXDLS 2016-2017
- Dyna Street Bob FXDB/I 2006-2017
- Dyna Super Glide Custom FXDC/I 2005-2014
- Dyna Super Glide FXD/I 1995-2010
- Dyna Super Glide Sport FXDX 1999-2005
- Dyna Super Glide Sport Touring FXDXT 2001-2003
- Dyna Wide Glide FXDWG/I 1993-2017
- Electra Glide Classic FLHTC/I 1984-2013
- Electra Glide Special FLHX 1984
- Electra Glide Sport FLHS 1984-1993
- Electra Glide Standard FLHT/I 1984-2009
- Electra Glide Ultra Classic FLHTCU/I 1987-2019
- Electra Glide Ultra Classic Low FLHTCUL 2015-2016
- Electra Glide Ultra Limited FLHTK 2010-2019
- Electra Glide Ultra Limited Low FLHTKL 2015-2019
- FLH 1984-1985
- Freewheeler FLRT 2015-2019
- Low Glide/Low Rider FXRS 1987-1993
- Low Rider Chrome FXRC 1987-1988
- Low Rider Sport FXRS-SP 1987-1993
- Night Rod Special VRSCDX 2007-2017
- Night Rod VRSCD 2006
- Night Rod VRSCD 2007-2008
- Road Glide Custom FLTRX 2010-2013
- Road Glide FLTR/I 1998-2009
- Road Glide FLTRX 2015-2019
- Road Glide Special FLTRXS 2015-2019
- Road Glide Ultra FLTRU 2011-2019
- Road King Classic FLHRC/I 1994-2013
- Road King Custom FLHRS/I 1995-2012
- Road King FLHR/I 1994-2019
- Road King Special FLHRXS 2017-2019
- Sport Glide FXRT 1987-1992
- Sportster Custom XL1200C 1996-2019
- Sportster Custom XL883C 1998-2009
- Sportster Deluxe XLH883DLX 1989-1992
- Sportster Forty-Eight Special XL1200XS 2018-2019
- Sportster Forty-Eight XL1200X 2010-2019
- Sportster Hugger XLH883HUG 1988-2003
- Sportster Iron XL1200NS 2018-2019
- Sportster Iron XL883N 2009-2019
- Sportster Low/SuperLow XL883L 2005-2019
- Sportster Low XL1200L 2006-2011
- Sportster Nightster XL1200N 2007-2012
- Sportster Roadster XL1200CX 2016-2019
- Sportster Roadster XL1200R 2004-2008
- Sportster Roadster XL883R 2002-2012
- Sportster Seventy-Two XL1200V 2012-2016
- Sportster Sport XL1200S 1996-2003
- Sportster SuperLow XL1200T 2014-2017
- Sportster XL883 2004-2009
- Sportster XLH1100 1986-1988
- Sportster XLH1200 1988-2003
- Sportster XLH883 1986-2003
- Street Glide FLHX/I 2006-2019
- Street Glide Special FLHXS 2014-2019
- Street Glide Trike FLHXXX 2010-2011
- Tour Glide Classic FLTC/I 1984-1991
- Tour Glide FLT 1984-1991
- Tour Glide Ultra Classic FLTCU/I 1989-1995
- Tri Glide Ultra Classic FLHTCUTG 2009-2019
- V-Rod Muscle VRSCF 2009-2017
- V-Rod VRSCA 2002-2006
- V-Rod VRSCAW 2007-2010
- V-Rod VRSCB 2004-2005
- V-Rod VRSCX 2007
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23 Questions & 27 Answers