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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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 Verify Component Photos |
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| Chainring Count | Double | BCD  | 130mm |
| BB Style | Square Taper (ISO) | Pedal Threads | 9/16" 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; 175 | Arm/Spider Material | Aluminum Alloy |
| Front Markings | Dura-Ace | Back Markings | [Crank length] [Date Code] |
| Extractor Threading | 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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