Shimano FC-DE20 / FC-DE21, Deore
Main Photo
Category:  Cranksets
Name:  Shimano FC-DE20 / FC-DE21, Deore
Brand:  Shimano
Primary Group:  Deore
Model:  FC-DE20
Years:  1982 - 1984
Country:  Japan
Added By: JFischer on 10/14/07
Updated By: JFischer on 11/13/07
Additional Photos - click for full size
Shimano FC-DE20 / FC-DE21, Deore
Chainring CountDoubleBCD 
BB StyleSquare Taper (JIS)Pedal Threads1" x 24 (Dyna-Drive)
BB Length 119mmFlutes None
Lengths 165; 170Arm/Spider MaterialAluminum Alloy
Front MarkingsDeoreBack MarkingsShimano Japan FC-DE21
Extractor Threading 22x1mm (Standard)  
General Information

One of the original touring groups from Shimano, the Deore name eventually became a Mountain Bike group in the late 80's and on.  This early 80's Deore group uses Shimano's 1" x 24tpi over sized pedal thread standard also found on the AX groups of the same time period.

There were two versions of the Deore double crank.  One given model number FC-DE20 (double LD Type), the other model FC-DE21 (double MD Type)

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Additional Resources
Resources:Reference & ChartsCatalogsGear Calculator
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 2)BrandGroup
Shimano FC-DE30 / FC-DE31, DeoreShimanoDeore
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Deore (First Generation)Shimano1980 - 1983, Touring & MTBView 12 Components
Details:   The original 'Deore' series of components, primarly designed for Touring bikes, but the extended range gearing made it more off-road capable than Shimano's other offerings of the time.
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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