Shimano HP-7400, Dura-Ace
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Category:  Headsets
Name:  Shimano HP-7400, Dura-Ace
Brand:  Shimano
Primary Group:  Dura-Ace 7400
Model:  HP-7400
Years:  1985 - 1994
Country:  Japan
Weight:  114 grams
Added By: JFischer on 10/16/07
Updated By: MGTS on 11/07/12
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Shimano HP-7400, Dura-AceShimano HP-7400, Dura-AceShimano HP-7400, Dura-AceShimano HP-7400, Dura-Ace
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Body MaterialAluminumUpper Bearing Size20 - 3/16' ball bearing
Lower Bearing Size20 - 3/16" ball bearingCrown Race SizeISO (26.4mm)
Upper Cup MarkingsDura-AceLower Cup MarkingsDura-Ace
Available Threading English/ISO/Italian (25.4mm x 24TPI);
French (25mm x 1mm)
Stack Height 36.3mm
General Information
Shimano's ultra light, high end Road Racing headset. The DA headset has cast aluminum upper, lower cups and head lock nut. Each of these parts, after being cast, is machined to their exquisite light weight final shape. The cup bottoms and tops, the seats for the steel races, and the threads for the head lock nut, are finished to the measured precision that a professional racer would want. The steel races are ground to the same precision. The fork cone race, which is subject to so much stress is titanium plated to add a harder surface. It uses twenty 4mm steel ball bearings in both steel retainers. This headset is triple sealed. There are seals between the cone and cup race surrounding the bearings to protect it from road contaminants and there is a stem seal in the head lock nut. This headset's stack height is 37mm and weighs 114 grams. It is made in the 1" size, with the English/Italian thread pattern, in Silver only. This headset was replaced by the 7410.  Lock nut is marked Shimano HP-7400.
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Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
Dura-Ace 7400Shimano1985 - 1993, Road RaceView 39 Components
Details:  

Shimano's top of the line race quality component group in the mid 80's through the early 90's.  The 7400 series Dura-Ace group saw several interations including the introduction of 6 then 7 and finally 8 speed SIS shifting.  Eventually upgraded with 7410 parts before finally being completely replaced with 7700.

Dur-Ace was developed to give the professional racing cyclist a fraction-of-a-second advantage that can spell the difference between victory and defeat. Advanced functions like 8 speed SIS, Super SLR brakes and Shimano Total Integration provide the most refined feeling of control available in a group today. Ultra high-precision mechanisms, quality materials and rugged construction assure that Dura-Ace takes all the punishment that pro-level road racing can dish out. (1991 Dealer Manual).

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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