# Rings Designed For  | Double | Outer Plate Markings | Dura-Ace |
| Inner Plate Markings | | Clamp Markings | |
| Inner Clamp Markings | | Design Category | Parallelogram |
| Pivot Arm Markings | | Plate Material | Chrome plated steel |
| Clamp Style | 28.6mm Clamp; Braze-on Tab | Cable Attachment Bolt | 5mm Allen Key |
| CableStop | No | Clamp Bolt Type | 5mm Allen Key |
| Max Ring Difference | 14T | | |
| Additional Resources |
| Resources: |  Reference & Charts Catalogs |
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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