Shimano FC-M550, Deore LX
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Main Photo
Category:  Cranksets
Name:  Shimano FC-M550, Deore LX
Brand:  Shimano
Primary Group:  Deore LX M550 Series
Model:  FC-M550
Years:  N/A
Country:  Japan
Weight:  749 grams (Actual),
Weight as pictured
Added By: ThermionicScott on 02/28/15
Updated By: ThermionicScott on 09/03/15
Additional Photos - click for full size
Shimano FC-M550, Deore LXShimano FC-M550, Deore LXShimano FC-M550, Deore LX
 Verify Component Photos
Chainring CountTripleBCD 110mm / 74mm
BB StyleSquare Taper (JIS)Pedal Threads9/16" x 20 (English)
BB Length Flutes None
Lengths 170; 175Arm/Spider MaterialAluminum Alloy
Front MarkingsShimano Deore LXBack MarkingsShimano FC-M550 VIA Japan 170
Extractor Threading 22x1mm (Standard)  
General Information
This crankset came to me on a '91 Bianchi Eros with a non-Shimano D-3N (32-52-36 for 120mm) spindle.  I'm not sure if that is the original spec, but it worked fine.  Date codes of "OD" and "OI" date these cranks to mid-1990.
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Additional Resources
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Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Deore LX M550 SeriesShimano1990 - 1992, Mountain BikeView 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.
Brand Information(click to expand)

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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