Shimano GA-300, Dura-Ace EX
Main Photo
Category:  Cranksets
Name:  Shimano GA-300, Dura-Ace EX
Brand:  Shimano
Primary Group:  Dura-Ace EX
Model:  GA-300
Years:  1978 - 1980
Country:  Japan
Weight:  610 grams,
172,5mm 52-42 with one key release bolts
Added By: JFischer on 11/02/07
Updated By: Tombo on 07/24/18
Additional Photos - click for full size
Shimano GA-300, Dura-Ace EXShimano GA-300, Dura-Ace EXShimano GA-300, Dura-Ace EXShimano GA-300, Dura-Ace EXShimano GA-300, Dura-Ace EXShimano GA-300, Dura-Ace EXShimano GA-300, Dura-Ace EX
 Verify Component Photos
Chainring CountDoubleBCD 130mm
BB StyleSquare Taper (ISO)Pedal Threads9/16" x 20 (English)
BB Length 107mm with 68s-BSA;
112mm English, 113mm Italian
Flutes Crank Arm; Spider
Lengths 160; 165; 167.5; 170; 172.5; 175Arm/Spider MaterialAluminum Alloy
Front MarkingsDura-AceBack Markings[Crank length] [Date Code]
Extractor Threading 22x1mm (Standard)  
General Information
Basically the same crankset as the First Generation Dura-Ace group.  This Crank was replaced by the FC-7200 in 1980.

I had originally listed this as a Dura Ace 7200 which is the dyna-drive system and is different from this. It was brought to my attention that it looked like a DA 7110,  I have other 7100 series components, although similar colored packaging, none of them have "EX" printed on the packaging and had a road series sticker, not "EX". As I was researching further, there was a very similar crank set, this was the GA - 300 & listed in their 1979 Catalog, , the packaging I have is very similar to package shown on the left.
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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-7110, Dura-AceShimanoDura-Ace 7100
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Dura-Ace EX, 7200 seriesShimano1978 - 1984, Road RaceView 32 Components
Details:   Also came in a 'Black' series early on (78-79 or so).  I do not see any mention of a black style in any of the 1980's catalogs of the 7200 series.
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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