• Softail models utilize the big-twin engine (F) and the Softail chassis (ST).
  • Softail models that use small-diameter telescopic forks similar to those used on the Sportster (X) have designations that begin with FXST, e.g., FXSTB (Night Train), FXSTD (Deuce), and FXSTS (Standard).
  • Softail models that use large-diameter telescopic forks similar to those used on the touring bikes (L) have designations beginning with FLST, e.g., FLSTF (Fat Boy), FLSTC (Heritage Softail Classic), and FLSTN (Softail Deluxe - "N" is for Nostalgic).
  • Softail models that use Springer forks with a 21-inch (530 mm) wheel have designations that begin with FXSTS, e.g., FXSTS (Springer Softail) and FXSTSB (Bad Boy).
  • Softail models that use Springer forks with a 16-inch (410 mm) wheel have designations that begin with FLSTS, e.g., FLSTSC (Springer Classic)

I think FXSTS (Springer Softail) and FXSTSB (Bad Boy) are some awsome bikes from the softail models of Harley-Davidson.

FLSTF (Fat Boy) is a good bike among all of them....