Shimano HB-7020, Dura-Ace 10
Main Photo
Category:  Hubs
Name:  Shimano HB-7020, Dura-Ace 10
Brand:  Shimano
Primary Group:  Dura-Ace 10
Model:  HB-7020
Years:  1981 - 1983
Country:  Japan
Weight:  520 grams
Added By: floid on 01/03/08
Updated By: JFischer on 01/11/10
Additional Photos - click for full size
Shimano HB-7020, Dura-Ace 10Shimano HB-7020, Dura-Ace 10Shimano HB-7020, Dura-Ace 10Shimano HB-7020, Dura-Ace 10
Gear Compatibility Fixed GearFront Bearing Size/Count
Rear Bearing Size/CountRear Spacing110mm
Spoke Drilling28; 32; 36Flange SizeHigh Flange
Gear Threading/Pattern BC33 x 24tpiBody Markings
Axle MaterialSteelShell MaterialAluminum
General Information
weight 32 th
front    217,7 gr
rear    286,7 gr  lockring alone  11,3 gr
Notes: the axle is hollow
Only Dura-Ace 10 sprockets and Lockrings will work on these hubs.  Because of this, prices for all Dura-Ace 10 parts on eBay are quite high in value as people who have these groups are looking to keep spares around and driving up prices the last I looked into it.  Sprocket treading is labeled as: BC33 x 24tpi and lock ring threading is labeled as: BC32 x 24tpi in the Shimano catalog.

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Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Dura-Ace 10, 7000 seriesShimano1977 - 1984, TrackView 8 Components
Details:   Shimano Dura-Ace 10 track groupset used a 10mm pitch chain and gears. See the comparison photo above (on Group View page) of the standard Dura-Ace track group (left) compared to the Dura-Ace 10 track group (right).
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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