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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 |
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Chainring Count | Double | BCD ![Bolt Circle Diameter (see Refernce Tables for details)](App_Themes/VeloBase2_red/Images/question.png) | 130mm |
BB Style | Square Taper (ISO) | Pedal Threads | 9/16" x 20 (English) |
BB Length ![Length of BB axle needed for correct chainline](App_Themes/VeloBase2_red/Images/question.png) | 107mm with 68s-BSA; 112mm English, 113mm Italian | Flutes ![Concave milling on the crank](App_Themes/VeloBase2_red/Images/question.png) | Crank Arm; Spider |
Lengths ![From spindle center to pedal axle center](App_Themes/VeloBase2_red/Images/question.png) | 160; 165; 167.5; 170; 172.5; 175 | Arm/Spider Material | Aluminum Alloy |
Front Markings | Dura-Ace | Back Markings | [Crank length] [Date Code] |
Extractor Threading ![Crank removal extractor threading](App_Themes/VeloBase2_red/Images/question.png) | 22x1mm (Standard) | |   |
Component Variations | View Detailed List Manage Variations |
Variations of Component exist (Component is 1 of 2) | Brand | Group |
Shimano FC-7110, Dura-Ace | Shimano | Dura-Ace 7100 |
Component Groups |
Primary Group Name | Brand | Quick Info | Browse Group Components |
Dura-Ace EX, 7200 series | Shimano | 1978 - 1984, Road Race | View 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. |
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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