# Rings Designed For  | Triple | Outer Plate Markings | None |
| Inner Plate Markings | FD-M550 Shimano VIA Japan [date code] | Clamp Markings | none |
| Inner Clamp Markings | [Clamp size] Japan VIA | Design Category | Parallelogram |
| Pivot Arm Markings | Shimano Deore LX | Plate Material | Chrome plated steel |
| Clamp Style | 28.6mm Clamp; 31.8mm Clamp | Cable Attachment Bolt | 5mm Allen Key |
| CableStop | No | Clamp Bolt Type | 5mm Allen Key |
| Max Ring Difference | 26T | | |
| Additional Resources |
| Resources: |  Reference & Charts Catalogs |
| Component Groups |
| Primary Group Name | Brand | Quick Info | Browse Group Components |
| Deore LX M550 Series | Shimano | 1990 - 1992, Mountain Bike | View 9 Components |
| Details: Deore LX was the 3th highest grouppo in 1990 ranked below Deore DX, then Deore XT, After XTR was introduced and Deore DX was dropped it would remain the 3rd highest grouppo in the Shimano MTB line up. Time period is 1990 onward. |
Shimano Model Number Prefix List:
| BB Bottom Bracket |
BL Brake Lever |
BR BRake |
| CB Coaster Brake |
CJ Cassette Joint |
CN ChaiN |
| CP Chain Protecto |
CR Chain Ring |
CS Cassette Sprockets |
| DF chain DeFlector |
DH Dynamo Hub |
FC Front Crank |
| FD Front Derailleur |
FE Fork Ends |
FH FreeHub |
| FS Front Suspension |
HB HuB |
HD HanDle bar |
| HP Head Parts (Head Set) |
HS Handle Stem |
IF Inter-3 Freehub |
| LP LamP |
MF Multi Freewheel |
PD PeDal |
| RD Rear Derailleur |
RH Rollerbrake Hub |
RM RiM |
| RR ReflectoRs |
RS Rear Suspension |
SB Shift Brake lever (Nexus, ?) |
| SC Speed Calculator (cycle computer) |
SF Single Freewheel Freilaufritzel |
SG Speed chanGe hub |
| SH SHoes |
SL Shift Lever Schalthebel |
SM SMall parts |
| SP Seat Post |
SQ Seat Quick release |
SS Single Sprocket |
| TL TooL |
WH WHeel
| ST Shift Brake Lever (STI, Rapid Fire, etc) |
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