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Bitubo HMG1 Twinshocks Adjustable: Spring Preload, Compression, Length, Black Spring

Bitubo's HMG12 shock absorbers offer greater comfort and add customizable ride height to the Harley-Davidson® Softail. By replacing the stock shocks, you can tailor the handling and stance to suit your riding style.
  • Continuous spring preload allows for adjustability to suit all riding situations
  • 24 compression settings for optimized grip and comfort
  • Adjustable by 8mm to fine-tune height and handling
  • Polished steel cylinders add a sleek, premium look

Upgrade the ride quality and handling of your Harley-Davidson Softail with Bitubo HMG12 adjustable twin shock absorbers, part number bitHD013HMG12. Designed as a replacement for the original equipment shocks, this suspension system allows riders to fine-tune comfort, grip, stance, and overall handling for different road conditions and riding preferences. The adjustable design makes these shocks a practical choice for riders seeking more control without sacrificing everyday comfort.


  • Continuous spring preload adjustment helps accommodate changing loads, passenger use, and varied riding conditions.

  • 24 compression settings allow precise tuning for optimized traction, control, and ride comfort.

  • Length adjustment provides up to 5/16 inch of tuning range for refining ride height, stance, and handling characteristics.

  • Polished steel shock cylinders and black springs provide a clean, premium appearance suited to custom and replacement applications.


Bitubo HMG12 shocks are engineered for riders who want greater suspension adjustability than the factory setup provides. By adjusting spring preload, compression damping, and shock length, you can tailor the motorcycle to your preferred riding style and conditions. Proper suspension setup can help improve stability through corners, maintain tire contact with the road, and provide a more controlled response over uneven surfaces. The Bitubo Suspension HMG12 twin-shock design combines functional performance adjustments with a polished finish for a purposeful upgrade.
These shocks fit select Harley-Davidson applications, including the 1984 and 1985 FXSB Low Rider with belt drive and 1987 through 1994 FXLR Low Rider Custom models. Confirm the motorcycle year, model, and existing suspension configuration before ordering to ensure proper application. Professional installation and setup are recommended, especially when changing ride height or damping settings.

Features:

  • Continuous spring preload adjustment for varied loads and riding conditions
  • 24 compression damping settings for customized grip and comfort
  • Adjustable shock length with up to 5/16 inch of ride-height tuning
  • Polished steel cylinders for a sleek, premium appearance
  • Black springs complement custom and replacement Harley-Davidson applications
  • Designed for select Harley-Davidson Softail and Low Rider models

Fitment:
Harley Davidson FLST Heritage Softail Base 1986
Harley Davidson FLST Heritage Softail Base 1987
Harley Davidson FLST Heritage Softail Base 1988
Harley Davidson FLST Heritage Softail Base 1989
Harley Davidson FLST Heritage Softail Base 1990
Harley Davidson FLSTC Heritage Softail Classic Base 1988
Harley Davidson FLSTC Heritage Softail Classic Base 1989
Harley Davidson FLSTC Heritage Softail Classic Base 1990
Harley Davidson FLSTC Heritage Softail Classic Base 1991
Harley Davidson FLSTC Heritage Softail Classic Base 1992
Harley Davidson FLSTC Heritage Softail Classic Base 1993
Harley Davidson FLSTC Heritage Softail Classic Base 1994
Harley Davidson FLSTC Heritage Softail Classic Base 1995
Harley Davidson FLSTC Heritage Softail Classic Base 1996
Harley Davidson FLSTC Heritage Softail Classic Base 1997
Harley Davidson FLSTC Heritage Softail Classic Base 1998
Harley Davidson FLSTC Heritage Softail Classic Base 1999
Harley Davidson FLSTF Fat Boy Base 1990
Harley Davidson FLSTF Fat Boy Base 1991
Harley Davidson FLSTF Fat Boy Base 1992
Harley Davidson FLSTF Fat Boy Base 1993
Harley Davidson FLSTF Fat Boy Base 1994
Harley Davidson FLSTF Fat Boy Base 1995
Harley Davidson FLSTF Fat Boy Base 1996
Harley Davidson FLSTF Fat Boy Base 1997
Harley Davidson FLSTF Fat Boy Base 1998
Harley Davidson FLSTF Fat Boy Base 1999
Harley Davidson FLSTN Heritage Softail Nostalgia Base 1993
Harley Davidson FLSTN Heritage Softail Special Base 1994
Harley Davidson FLSTN Heritage Softail Special Base 1995
Harley Davidson FLSTN Heritage Softail Special Base 1996
Harley Davidson FLSTS Heritage Springer Base 1997
Harley Davidson FLSTS Heritage Springer Base 1998
Harley Davidson FLSTS Heritage Springer Base 1999
Harley Davidson FXLR Low Rider Custom Base 1987
Harley Davidson FXLR Low Rider Custom Base 1988
Harley Davidson FXLR Low Rider Custom Base 1989
Harley Davidson FXLR Low Rider Custom Base 1990
Harley Davidson FXLR Low Rider Custom Base 1991
Harley Davidson FXLR Low Rider Custom Base 1992
Harley Davidson FXLR Low Rider Custom Base 1993
Harley Davidson FXLR Low Rider Custom Base 1994
Harley Davidson FXSB Low Rider - Belt Base 1984
Harley Davidson FXSB Low Rider - Belt Base 1985
Harley Davidson FXST Softail Standard Base 1984
Harley Davidson FXST Softail Standard Base 1985
Harley Davidson FXST Softail Standard Base 1986
Harley Davidson FXST Softail Standard Base 1987
Harley Davidson FXST Softail Standard Base 1988
Harley Davidson FXST Softail Standard Base 1989
Harley Davidson FXST Softail Standard Base 1990
Harley Davidson FXST Softail Standard Base 1991
Harley Davidson FXST Softail Standard Base 1992
Harley Davidson FXST Softail Standard Base 1993
Harley Davidson FXST Softail Standard Base 1994
Harley Davidson FXST Softail Standard Base 1995
Harley Davidson FXST Softail Standard Base 1996
Harley Davidson FXST Softail Standard Base 1997
Harley Davidson FXST Softail Standard Base 1998
Harley Davidson FXST Softail Standard Base 1999
Harley Davidson FXSTB Night Train Base 1999
Harley Davidson FXSTC Softail Custom Base 1986
Harley Davidson FXSTC Softail Custom Base 1987
Harley Davidson FXSTC Softail Custom Base 1988
Harley Davidson FXSTC Softail Custom Base 1989
Harley Davidson FXSTC Softail Custom Base 1990
Harley Davidson FXSTC Softail Custom Base 1991
Harley Davidson FXSTC Softail Custom Base 1992
Harley Davidson FXSTC Softail Custom Base 1993
Harley Davidson FXSTC Softail Custom Base 1994
Harley Davidson FXSTC Softail Custom Base 1995
Harley Davidson FXSTC Softail Custom Base 1996
Harley Davidson FXSTC Softail Custom Base 1997
Harley Davidson FXSTC Softail Custom Base 1998
Harley Davidson FXSTC Softail Custom Base 1999
Harley Davidson FXSTS Springer Softail Base 1988
Harley Davidson FXSTS Springer Softail Base 1989
Harley Davidson FXSTS Springer Softail Base 1990
Harley Davidson FXSTS Springer Softail Base 1991
Harley Davidson FXSTS Springer Softail Base 1992
Harley Davidson FXSTS Springer Softail Base 1993
Harley Davidson FXSTS Springer Softail Base 1994
Harley Davidson FXSTS Springer Softail Base 1995
Harley Davidson FXSTS Springer Softail Base 1996
Harley Davidson FXSTS Springer Softail Base 1997
Harley Davidson FXSTS Springer Softail Base 1998
Harley Davidson FXSTS Springer Softail Base 1999
Harley Davidson FXSTSB Bad Boy Base 1995
Harley Davidson FXSTSB Bad Boy Base 1996
Harley Davidson FXSTSB Bad Boy Base 1997