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| Category: | Headsets |
| Name: | Shimano UA-100, Dura-Ace First Gen. |
| Brand: | Shimano |
| Primary Group: | Dura-Ace |
| Model: | UA-100 |
| Years: | 1973 - 1978 |
| Country: | Japan |
| Added By: | JFischer on 07/19/07 |
| Updated By: | chkamb on 04/10/20 |
Additional Photos - click for full size |
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 Verify Component Photos |
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| Body Material | Steel | Upper Bearing Size | |
| Lower Bearing Size | | Crown Race Size | ISO (26.4mm) |
| Upper Cup Markings | Two gooves running around the cup | Lower Cup Markings | Two gooves running around the cup |
Available Threading  | English/ISO/Italian (25.4mm x 24TPI) | Stack Height | |
| Additional Resources |
| Resources: |  Reference & Charts Catalogs |
| Component Variations | View Detailed List Manage Variations |
| Variations of Component exist (Component is 1 of 2) | Brand | Group |
| Shimano UA-100, Dura-Ace (Black) | Shimano | Dura-Ace |
| Component Groups |
| Primary Group Name | Brand | Quick Info | Browse Group Components |
| Dura-Ace, First Generation | Shimano | 1973 - 1976, Road Race | View 34 Components |
| Details: The introduction of Dura-Ace in the mid 1970's, along with the indroduction of the Shimano 600 group were Shimano's first attempts at a professional quality road racing component group. The first Generation Dura-Ace was updated and renamed the 7100 series by around 1977/78. |
| Group Name | Brand | Quick Info | Browse Group Components |
| Dura-Ace 7100 | Shimano | 1977 - 1984, Road Race | View 18 Components |
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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