Shimano BB-1050, 105
Main Photo
Category:  Bottom Brackets
Name:  Shimano BB-1050, 105
Brand:  Shimano
Primary Group:  105 1050 Series
Model:  BB-1050
Years:  1985 - 1988
Country:  Japan
Weight:  341 grams (Actual),
with crank bolts
Added By: MGTS on 12/04/09
Updated By: JFischer on 11/13/10
Additional Photos - click for full size
Shimano BB-1050, 105Shimano BB-1050, 105Shimano BB-1050, 105
Bearing Size/Count per side1/4" / 9x9Spindle MarkingsShimano {shell width} = W= {given spindle length} Japan VIA D-5H {2 letter date code} CrMo
Fixed Cup MarkingsShimano Japan {thread} (a triangle) VIA {2 letter date code}Adjustable Cup MarkingsShimano Japan {thread} (a triangle) VIA {2 letter date code} lockring: Japan {thread} (a triangle)
Spindle StyleSquare TaperAxle MaterialSteel
Available ThreadingsEnglish/ISO: 1.370 x 24;
Italian: 36mm x 24
Tools NeededLocknut Wrench;
Spanner, Locknut Wrench and Fixed Cup Wrench
General Information
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Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
105 1050 SeriesShimano1987 - 1989, Road RaceView 20 Components
Details:   Introduced in 1987 (first appearing in August 1986 Catalog for the 1987 Year) Shimano 105 would introduce  alot of new technologies that year. that would not be seen on Shimano 600 for another year. Technologies such as SLR (Shimano Linear Response) Brake systems in 1989 The grouppo was updated  for 7 speed and it was replaced by the 105SC group in 1990.
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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