Description
- Heavy-duty version of the Progressive Suspension fork springs
- The cost-effective go-to for a substantial increase in front end ride quality
- Include Progressive Suspension rate springs combined with preload spacers
- Can improve front end stability and brake dive control as well as increase comfort for heavier riders or those looking for a firm high-performance feel out of their forks
| YEAR | MAKE | MODEL | POSITION | NOTES |
|---|---|---|---|---|
| 2016-2017 | Harley-Davidson | Fat Boy S FLSTFBS | – | – |
| 2016-2017 | Harley-Davidson | Softail Slim S FLSS | – | – |
| 2014-2015 | Harley-Davidson | CVO Softail Deluxe FLSTNSE | – | – |
| 2013 | Harley-Davidson | CVO Road Glide Custom FLTRXSE2 | – | – |
| 2013 | Harley-Davidson | CVO Electra Glide Ultra Classic FLHTCUSE8 | – | – |
| 2013 | Harley-Davidson | CVO Road King FLHRSE5 | – | – |
| 2012-2017 | Harley-Davidson | Softail Slim FLS | – | – |
| 2012-2017 | Harley-Davidson | Softail Deluxe EFI FLSTNI | – | – |
| 2012-2017 | Harley-Davidson | Softail Fat Boy EFI FLSTFI | – | – |
| 2012-2017 | Harley-Davidson | Softail Heritage Classic EFI FLSTCI | – | – |
| 2012-2016 | Harley-Davidson | Fat Boy Lo FLSTFB | – | – |
| 2012 | Harley-Davidson | CVO Street Glide FLHXSE3 | – | – |
| 2012 | Harley-Davidson | CVO Softail Convertible FLSTSE3 | – | – |
| 2012 | Harley-Davidson | CVO Road Glide Custom FLTRXSE | – | – |
| 2012 | Harley-Davidson | CVO Electra Glide Ultra Classic FLHTCUSE7 | – | – |
| 2011-2013 | Harley-Davidson | Road Glide Ultra FLTRU | – | – |
| 2011 | Harley-Davidson | CVO Street Glide FLHXSE2 | – | – |
| 2011 | Harley-Davidson | CVO Electra Glide Ultra Classic FLHTCUSE6 | – | – |
| 2011 | Harley-Davidson | CVO Softail Convertible FLSTSE2 | – | – |
| 2011 | Harley-Davidson | CVO Road Glide Ultra FLTRUSE | – | – |
| 2010-2013 | Harley-Davidson | Road Glide Custom FLTRX | – | – |
| 2010-2013 | Harley-Davidson | Electra Glide Ultra Limited FLHTK | – | – |
| 2010-2013 | Harley-Davidson | Road King Classic EFI FLHRC | – | – |
| 2010-2013 | Harley-Davidson | Street Glide EFI FLHX | – | – |
| 2010-2013 | Harley-Davidson | Road King Classic FLHRC | – | – |
| 2010 | Harley-Davidson | CVO Electra Glide Ultra Classic FLHTCUSE5 | – | – |
| 2010 | Harley-Davidson | CVO Softail Convertible FLSTSE | – | – |
| 2010 | Harley-Davidson | CVO Street Glide FLHXSE | – | – |
| 2009-2013 | Harley-Davidson | Road King EFI FLHR | – | – |
| 2009-2013 | Harley-Davidson | Electra Glide Ultra Classic EFI FLHTCUI | – | – |
| 2009-2013 | Harley-Davidson | Electra Glide Police FLHTPI | – | – |
| 2009-2013 | Harley-Davidson | Electra Glide Classic EFI FLHTCI | – | – |
| 2009-2011, 2017 | Harley-Davidson | Fat Boy Lo FLSTFB | – | – |
| 2009 | Harley-Davidson | CVO Road Glide FLTRSE3 | – | – |
| 2009 | Harley-Davidson | Road King Classic FLHRC | – | – |
| 2009 | Harley-Davidson | CVO Electra Glide Ultra Classic FLHTCUSE4 | – | – |
| 2009 | Harley-Davidson | Street Glide EFI FLHX | – | – |
| 2009 | Harley-Davidson | Road King Classic EFI FLHRC | – | – |
| 2009 | Harley-Davidson | Electra Glide Standard EFI FLHTI | – | – |
| 2009 | Harley-Davidson | Road Glide EFI FLTR | – | – |
| 2008-2011 | Harley-Davidson | Softail Cross Bones FLSTSB | – | – |
| 2008 | Harley-Davidson | Screamin’ Eagle Road King FLHRSE4 | – | – |
| 2008 | Harley-Davidson | Screamin’ Eagle Electra Glide Ultra Classic FLHTCUSE3 | – | – |
| 2007-2012 | Harley-Davidson | Softail Standard EFI FXSTI | – | – |
| 2007-2011 | Harley-Davidson | Softail Fat Boy EFI FLSTFI | – | – |
| 2007-2011 | Harley-Davidson | Softail Heritage Classic EFI FLSTCI | – | – |
| 2007-2011 | Harley-Davidson | Softail Deluxe EFI FLSTNI | – | – |
| 2007-2010 | Harley-Davidson | Softail Custom EFI FXSTC | – | – |
| 2007-2009 | Harley-Davidson | Softail Night Train EFI FXSTBI | – | – |
| 2007-2008 | Harley-Davidson | Road King Classic EFI FLHRC | – | – |
| 2007-2008 | Harley-Davidson | Road Glide EFI FLTR | – | – |
| 2007-2008 | Harley-Davidson | Street Glide EFI FLHX | – | – |
| 2007-2008 | Harley-Davidson | Road King EFI FLHR | – | – |
| 2007-2008 | Harley-Davidson | Electra Glide Standard EFI FLHTI | – | – |
| 2007-2008 | Harley-Davidson | Electra Glide Classic EFI FLHTCI | – | – |
| 2007 | Harley-Davidson | Screamin’ Eagle Road King FLHRSE3 | – | – |
| 2007 | Harley-Davidson | Screamin’ Eagle Electra Glide Ultra Classic FLHTCUSE2 | – | – |
| 2007 | Harley-Davidson | Road King Custom EFI FLHRS | – | – |
| 2007 | Harley-Davidson | Softail Deuce EFI FXSTDI | – | – |
| 2006-2008 | Harley-Davidson | Electra Glide Ultra Classic EFI FLHTCUI | – | – |
| 2006-2008 | Harley-Davidson | Electra Glide Police FLHTPI | – | – |
| 2006 | Harley-Davidson | Screamin’ Eagle Electra Glide Ultra Classic FLHTCUSE | – | – |
| 2006 | Harley-Davidson | Screamin’ Eagle Fat Boy FLSTFSE2 | – | – |
| 2006 | Harley-Davidson | Street Glide EFI FLHX | – | – |
| 2006 | Harley-Davidson | Softail Heritage EFI FLSTI | – | – |
| 2006 | Harley-Davidson | Street Glide FLHX | – | – |
| 2006 | Harley-Davidson | Electra Glide Standard FLHT | – | – |
| 2006 | Harley-Davidson | Softail Night Train EFI FXSTBI | – | – |
| 2006 | Harley-Davidson | Softail Standard FXST | – | – |
| 2006 | Harley-Davidson | Electra Glide Classic FLHTC | – | – |
| 2006 | Harley-Davidson | Electra Glide Ultra Classic FLHTCU | – | – |
| 2006 | Harley-Davidson | Softail Night Train FXSTB | – | – |
| 2006 | Harley-Davidson | Electra Glide Classic EFI FLHTCI | – | – |
| 2006 | Harley-Davidson | Road Glide FLTR | – | – |
| 2006 | Harley-Davidson | Softail Standard EFI FXSTI | – | – |
| 2006 | Harley-Davidson | Softail Heritage FLST | – | – |
| 2006 | Harley-Davidson | Electra Glide Police FLHTP | – | – |
| 2006 | Harley-Davidson | Electra Glide Standard EFI FLHTI | – | – |
| 2006 | Harley-Davidson | Road Glide EFI FLTR | – | – |
| 2005-2006 | Harley-Davidson | Softail Deluxe FLSTN | – | – |
| 2005-2006 | Harley-Davidson | Softail Deluxe EFI FLSTNI | – | – |
| 2005 | Harley-Davidson | Screamin’ Eagle Fat Boy FLSTFSE | – | – |
| 2005 | Harley-Davidson | 15th Anniversary Fat Boy FLSTF | – | – |
| 2004-2006 | Harley-Davidson | Road King Custom EFI FLHRS | – | – |
| 2004-2006 | Harley-Davidson | Road King Custom FLHRS | – | – |
| 2004-2006 | Harley-Davidson | Road King Classic EFI FLHRC | – | – |
| 2004-2006 | Harley-Davidson | Road King FLHR | – | – |
| 2004-2006 | Harley-Davidson | Softail Heritage Classic FLSTC | – | – |
| 2004-2006 | Harley-Davidson | Softail Fat Boy FLSTF | – | – |
| 2004-2006 | Harley-Davidson | Softail Heritage Classic EFI FLSTCI | – | – |
| 2004-2006 | Harley-Davidson | Road King EFI FLHR | – | – |
| 2004-2006 | Harley-Davidson | Softail Fat Boy EFI FLSTFI | – | – |
| 2003-2005 | Harley-Davidson | Softail Night Train EFI FXSTBI | – | – |
| 2003-2005 | Harley-Davidson | Softail Night Train FXSTB | – | – |
| 2003-2005 | Harley-Davidson | Softail Standard FXST | – | – |
| 2003-2005 | Harley-Davidson | Softail Standard EFI FXSTI | – | – |
| 2002-2005 | Harley-Davidson | Wide Glide FXDWG | – | – |
| 2002-2005 | Harley-Davidson | Wide Glide EFI FXDWGI | – | – |
| 2002-2003 | Harley-Davidson | Softail Fat Boy EFI FLSTFI | – | – |
| 2002 | Harley-Davidson | Wide Glide FXDWG3 | – | – |
| 2001-2006 | Harley-Davidson | Softail Deuce EFI FXSTDI | – | – |
| 2001-2003 | Harley-Davidson | Softail Heritage Classic EFI FLSTCI | – | – |
| 2001-2002 | Harley-Davidson | Softail Standard EFI FXSTI | – | – |
| 2001-2002 | Harley-Davidson | Softail Night Train EFI FXSTBI | – | – |
| 2001 | Harley-Davidson | Wide Glide FXDWG2 | – | – |
| 2001 | Harley-Davidson | Screamin’ Eagle Road Glide FLTRSE-I2 | – | – |
| 2000-2006 | Harley-Davidson | Softail Deuce FXSTD | – | – |
| 2000-2003 | Harley-Davidson | Softail Heritage Classic FLSTC | – | – |
| 2000-2003 | Harley-Davidson | Softail Fat Boy FLSTF | – | – |
| 2000-2002 | Harley-Davidson | Softail Night Train FXSTB | – | – |
| 2000-2002 | Harley-Davidson | Softail Standard FXST | – | – |
| 2000-2001 | Harley-Davidson | Wide Glide EFI FXDWGI | – | – |
| 2000-2001 | Harley-Davidson | Electra Glide Standard EFI FLHTI | – | – |
| 2000 | Harley-Davidson | Screamin’ Eagle Road Glide FLTRSE-I | – | – |
| 1999-2001 | Harley-Davidson | Wide Glide FXDWG | – | – |
| 1999 | Harley-Davidson | Softail Night Train FXSTB | – | – |
| 1998-2002 | Harley-Davidson | Road Glide FLTR | – | – |
| 1998-2001 | Harley-Davidson | Road Glide EFI FLTR | – | – |
| 1997-2003 | Harley-Davidson | Road King Classic EFI FLHRC | – | – |
| 1997-2001 | Harley-Davidson | Electra Glide Ultra Classic EFI FLHTCUI | – | – |
| 1997-2001 | Harley-Davidson | Electra Glide Police FLHTPI | – | – |
| 1997-1999 | Harley-Davidson | Softail Standard FXST | – | – |
| 1997-1999 | Harley-Davidson | Softail Custom FXSTC | – | – |
| 1997-1999 | Harley-Davidson | Softail Fat Boy FLSTF | – | – |
| 1997-1999 | Harley-Davidson | Softail Heritage Classic FLSTC | – | – |
| 1997-1998 | Harley-Davidson | Wide Glide FXDWG | – | – |
| 1996-2003 | Harley-Davidson | Road King EFI FLHR | – | – |
| 1996 | Harley-Davidson | Tour Glide Ultra Classic EFI FLTCU | – | – |
| 1995-2001 | Harley-Davidson | Electra Glide Classic EFI FLHTCI | – | – |
| 1995-1996 | Harley-Davidson | Softail Custom FXSTC | – | – |
| 1995-1996 | Harley-Davidson | Softail Standard FXST | – | – |
| 1995-1996 | Harley-Davidson | Softail Heritage Classic FLSTC | – | – |
| 1995-1996 | Harley-Davidson | Softail Fat Boy FLSTF | – | – |
| 1995-1996 | Harley-Davidson | Softail Heritage Special FLSTN | – | – |
| 1994-2003 | Harley-Davidson | Road King FLHR | – | – |
| 1994 | Harley-Davidson | Softail Heritage Special FLSTN | – | – |
| 1993-1996 | Harley-Davidson | Wide Glide FXDWG | – | – |
| 1993 | Harley-Davidson | Softail Nostalgia FLSTN | – | – |
| 1993 | Harley-Davidson | Softail Custom FXSTC | – | – |
| 1993 | Harley-Davidson | Softail Standard FXST | – | – |
| 1993 | Harley-Davidson | Softail Fat Boy FLSTF | – | – |
| 1993 | Harley-Davidson | Softail Heritage Classic FLSTC | – | – |
| 1991-1992, 1994 | Harley-Davidson | Softail Custom FXSTC | – | – |
| 1991-1992, 1994 | Harley-Davidson | Softail Standard FXST | – | – |
| 1991-1992, 1994 | Harley-Davidson | Softail Heritage Classic FLSTC | – | – |
| 1991-1992, 1994 | Harley-Davidson | Softail Fat Boy FLSTF | – | – |
| 1990 | Harley-Davidson | Softail Fat Boy FLSTF | – | – |
| 1989-2001 | Harley-Davidson | Electra Glide Ultra Classic FLHTCU | – | – |
| 1989-1996 | Harley-Davidson | Tour Glide Ultra Classic FLTCU | – | – |
| 1987-1993 | Harley-Davidson | Electra Glide Sport FLHS | – | – |
| 1987-1990 | Harley-Davidson | Softail Heritage Classic FLSTC | – | – |
| 1986-1990 | Harley-Davidson | Softail Heritage FLST | – | – |
| 1986-1990 | Harley-Davidson | Softail Custom FXSTC | – | – |
| 1986-1990 | Harley-Davidson | Softail Standard FXST | – | – |
| 1985-1994 | Harley-Davidson | Tour Glide Classic FLTC | – | – |
| 1985-1986 | Harley-Davidson | Tour Glide FLT | – | – |
| 1984-1986 | Harley-Davidson | Wide Glide FXWG | – | – |
| 1984-1985 | Harley-Davidson | Softail Standard FXST | – | – |
| 1983-2001 | Harley-Davidson | Electra Glide Classic FLHTC | – | – |
| 1983, 1997-2001 | Harley-Davidson | Electra Glide Police FLHTP | – | – |
| 1983, 1985-1987, 1995-2001 | Harley-Davidson | Electra Glide Standard FLHT | – | – |
| 1983 | Harley-Davidson | Disc Glide FXDG | – | – |
| 1981-1982 | Harley-Davidson | Electra Glide Classic FLH | – | – |
| 1981 | Harley-Davidson | Electra Glide Heritage FLH | – | – |
| 1980-1984 | Harley-Davidson | Tour Glide FLT | – | – |
| 1980-1984 | Harley-Davidson | Tour Glide Classic FLTC | – | – |
| 1980-1983 | Harley-Davidson | Wide Glide FXWG | – | – |
| 1979-1982 | Harley-Davidson | Electra Glide Sport FLHS | – | – |
| 1979-1981 | Harley-Davidson | Electra Glide Classic FLHC | – | – |
| 1979-1980 | Harley-Davidson | 1200 Electra Glide FLH | – | – |
| 1978-1985 | Harley-Davidson | Electra Glide FLH | – | – |
| 1966-1981 | Harley-Davidson | Electra Glide FL | – | – |
| 1966-1978 | Harley-Davidson | 1200 Electra Glide FLH | – | – |
| 1965 | Harley-Davidson | 1200 Electra Glide FLH | – | – |
| 1965 | Harley-Davidson | Electra Glide FL | – | – |
| 1958-1964 | Harley-Davidson | Duo Glide FL | – | – |
| 1958-1964 | Harley-Davidson | Duo Glide FLH | – | – |
| 1949-1957 | Harley-Davidson | Hydra Glide FL | – | – |
| 1947-1977 | Harley-Davidson | FL | – | – |
| 1947 | Harley-Davidson | Knucklehead FL | – | – |
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