1ST LETTER – ENGINE SERIES/TYPE
- B – OVERHEAD VALVE 69 CUBIC INCH SINGLE/BIG TWIN (e.g., BA, early 1920s-1930s)
- E – OVERHEAD VALVE 61 CUBIC INCHES BIG TWIN (SEPARATE ENGINE AND TRANSMISSION) *KNUCKLEHEAD
- F – OVERHEAD VALVE BIG TWIN, 74+ CUBIC INCH ENGINES *KNUCKLE, PAN, SHOVEL, EVO, TWIN CAM & M8
- G – SERVI-CAR (THREE-WHEELER) 1937-1973 *GE WAS ELECTRIC START 1963-1973
- J – F HEAD (IOE, OR INTAKE OVER EXHAUST) 61 AND 74 CUBIC INCH ENGINES
- K – FLATHEAD, SIDE-VALVE 45/55 CUBIC INCH ENGINES 1952-1956 *PRECURSOR TO XL (SPORTSTER) IN 1957
- R – FLATHEAD 45 CUBIC INCH ENGINES (e.g., RL, 1932-1936)
- U – SIDE VALVE BIG TWIN, FLATHEAD, 74 AND 80 CUBIC INCH
- V – SIDE VALVE 74 CUBIC INCHES 1930-1936 (e.g., VL models)
- W – SIDE VALVE 45 CUBIC INCHES 1937-1952
- X – SPORTS AND SPECIAL CONSTRUCTION *PRECURSOR WAS K-MODEL IN 1952, XL (SPORTSTER) IN 1957
- V – REVOLUTION ENGINE, DUAL OVERHEAD CAMS & LIQUID-COOLED (V-Rod family, VRSC prefix)
2ND LETTER – FRONT END SIZE (EXCLUDES SPORTSTER & V-ROD MODELS)
- H – HEAVY-DUTY FRONT END (e.g., FLH)
- L – WIDE FRONT TIRE AND HYDRA-GLIDE STYLE FRONT FORKS
- T – TRIKE-SPECIFIC FRONT END (e.g., FLHTCUTG)
- X – NARROW TIRE AND SPORT FORKS
3RD LETTER – FRAME STYLE (4TH AND 5TH LETTERS FOR SOFTAIL, ENGINE SIZE FOR XL)
- C – CUSTOM FRAME (e.g., FXCWC)
- D – DYNA
- H – HIGHWAY
- R – RUBBER-MOUNTED FRAME (e.g., FXR)
- ST – SOFTAIL
- T – TOURING
- 883 – SPORTSTER
- 1200 – SPORTSTER
4TH LETTER – SPECIFIC MODEL FEATURES *5TH LETTER FOR SOFTAIL, AFTER ENGINE SIZE FOR SPORTSTER
- A – MILITARY
- B – BELT DRIVE FOR INITIAL 1980’S MODELS, BLACK PAINT FOR THE BAD BOY IN 1995-1996
- C – VARIOUS MEANINGS INCLUDING CLASSIC, COMPETITION (XLCH), CUSTOM
- D – DEUCE
- DG – DISC GLIDE
- E – ELECTRIC START
- F – FAT BOY MODEL
- G – GLIDE (e.g., FXDG)
- H – VARIOUS MEANINGS INCLUDING HAND SHIFT, HIGH PERFORMANCE AND HEAVY DUTY
- I – FUEL INJECTION
- K – LIMITED OR SPECIAL EDITION (e.g., FLHTK)
- L – LOW OR LOW RIDER
- LR – CAN DENOTE LOW RIDER
- N – NOSTALGIA, IRON (XL883N, SPORTSTER 883 IRON), DELUXE
- P – POLICE MODEL
- R – ROAD KING, RUBBER MOUNT (FXR)
- S – SPRINGER
- S (NOT “ST”) – SPORTS VERSION
- SC – SPRINGER CUSTOM
- T – TOURING
- V – SEVENTY-TWO (XL1200V, SPORTSTER 1200 SEVENTY-TWO)
- WG – WIDE GLIDE FRONT END
- X – EXPERIMENTAL OR SPECIAL CONSTRUCTION (e.g., XR1000)
HARLEY DAVIDSON TOURING
- FLHR – ROAD KING
- FLHRCI – ROAD KING CLASSIC
- FLHRSI – ROAD KING CUSTOM
- FLHS – ELECTRA GLIDE SPORT
- FLHT – ELECTRA GLIDE STANDARD
- FLHTC – ELECTRA GLIDE CLASSIC
- FLHTCU – ULTRA CLASSIC ELECTRA GLIDE
- FLHTCUL – ULTRA CLASSIC ELECTRA GLIDE LOW
- FLHTK – ELECTRA GLIDE ULTRA LIMITED
- FLHTKL – ELECTRA GLIDE ULTRA LIMITED LOW
- FLHTP – ELECTRA GLIDE POLICE
- FLHX – STREET GLIDE
- FLHXS – STREET GLIDE SPECIAL
- FLHXSE – CVO STREET GLIDE
- FLHXXX – STREET GLIDE TRIKE
- FLHTCUSE – CVO ULTRA CLASSIC ELECTRA GLIDE
- FLHTCUTG – TRI-GLIDE
- FLTC – RUBBER MOUNTED DRESSER CLASSIC
- FLTCU – RUBBER MOUNTED DRESSER CLASSIC ULTRA
- FLTR – ROAD GLIDE
- FLTRSE – CVO SCREAMIN’ EAGLE ROAD GLIDE
- FLTRU – ROAD GLIDE ULTRA
- FLTRUSE – CVO ROAD GLIDE ULTRA
- FLTRX – ROAD GLIDE CUSTOM
- FLTRXS – ROAD GLIDE SPECIAL
HARLEY DAVIDSON SOFTAIL
- FLS – SOFTAIL SLIM
- FLSS – SOFTAIL SLIM S
- FLST – SOFTAIL
- FLSTC – HERITAGE SOFTAIL CLASSIC
- FLSTF – FAT BOY
- FLSTN – SOFTAIL DELUXE
- FLSTSB – CROSS BONES
- FLSTSC – SPRINGER SOFTAIL CLASSIC
- FLSTSE – CVO SOFTAIL CONVERTIBLE
- FXB – STURGIS (1980-1982)
- FXCW – SOFTAIL ROCKER
- FXCWC – SOFTAIL ROCKER CUSTOM
- FX – SOFTAIL BLACKLINE
- FXSB – SOFTAIL BREAKOUT
- FXSBSE – SOFTAIL CVO BREAKOUT
- FXSTB – NIGHT TRAIN
- FXSTC – SOFTAIL CUSTOM
- FXSTD – SOFTAIL DEUCE
- FXSTS – SPRINGER SOFTAIL
- FXSTSB – BAD BOY (1995-1997)
- FXSTSSE – CVO SOFTAIL SPRINGER SCREAMIN’ EAGLE
HARLEY DAVIDSON DYNA/FX
- FLD – DYNA SWITCHBACK
- FXD – DYNA SUPERGLIDE
- FXDB – DYNA STREET BOB
- FXDBI – DYNA STREET BOB (FUEL INJECTED)
- FXDC – DYNA SUPER GLIDE CUSTOM
- FXDF – DYNA FAT BOB
- FXDFSE – CVO FAT BOB
- FXDL – DYNA LOW RIDER
- FXDS-CON – DYNA CONVERTIBLE
- FXDWG – DYNA WIDE GLIDE
- FXDX – DYNA SUPER GLIDE SPORT
- FXDXT – DYNA SUPER GLIDE T-SPORT
- FXR – SUPERGLIDE II
- FXRP – POLICE/DEFENDER
- FXRS – LOW GLIDE / FXR SPORT / SPORT CONVERTIBLE
- FXRT – SPORT GLIDE
- FXS – LOW RIDER
HARLEY DAVIDSON SPORTSTER
- XL – SPORTSTER
- XL50 – SPORTSTER 50TH ANNIVERSARY ED.
- XL883 – SPORTSTER 883
- XL883C – SPORTSTER 883 CUSTOM
- XL883L – SPORTSTER 883 LOW
- XL883N – SPORTSTER 883 IRON
- XL883R – SPORTSTER 883 ROADSTER
- XLH883 – SPORTSTER HUGGER
- XL1200 – SPORTSTER 1200
- XL1200C – SPORTSTER 1200 CUSTOM
- XL1200L – SPORTSTER 1200 LOW
- XL1200N – SPORTSTER 1200 NIGHTSTER
- XL1200R – SPORTSTER 1200 ROADSTER
- XL1200S – SPORTSTER 1200 SPORT
- XL1200T – SPORTSTER 1200 SUPERLOW
- XL1200V – SPORTSTER SEVENTY-TWO
- XL1200X – SPORTSTER FORTY-EIGHT
- XR1200 – SPORTSTER XR1200 (PERFORMANCE MODEL)
HARLEY DAVIDSON V-ROD
- VRSC – V-ROD
- VRSCAW – V-ROD (240MM REAR TIRE)
- VRSCB – V-ROD BLACK FINISH
- VRSCD – NIGHT ROD
- VRSCDX – NIGHT ROD SPECIAL
- VRSCF – V-ROD MUSCLE
- VRSCR – STREET ROD
- VRSCX – V-ROD SCREAMIN’ EAGLE (2005-2006)