Shimano BB-1055, 105SC
Main Photo
Category:  Bottom Brackets
Name:  Shimano BB-1055, 105SC
Brand:  Shimano
Primary Group:  105SC
Model:  BB-1055
Years:  1990 - 1991
Country:  Japan
Weight:  304 grams (Actual)
Added By: JFischer on 10/12/07
Updated By: ekxlme on 10/11/15
Additional Photos - click for full size
Shimano BB-1055, 105SCShimano BB-1055, 105SCShimano BB-1055, 105SCShimano BB-1055, 105SCShimano BB-1055, 105SCShimano BB-1055, 105SC
Bearing Size/Count per side1/4" / 11x11Spindle Markings68 = W = 113
Fixed Cup MarkingsJapanAdjustable Cup Markings
Spindle StyleSquare Taper (JIS)Axle MaterialSteel
Available ThreadingsEnglish/ISO: 1.370 x 24;
Italian: 36mm x 24
Length(s)115mm Italian
Tools NeededSpanner, Locknut Wrench and Fixed Cup Wrench  
General Information
Shimano "105 SC" bottom bracket (Model BB-1055). This model succeeded Shimano's BB-1050, and although very similar, this model includes some design advantages. The most notable are the rubber-like ring inserts that line the inside of the cone to prevent dirt and other elements from entering through the spindle/axle opening. We also noted this model comes standard with the flexible plastic sleeve that touches the inside of both cups to form another seal to keep dirt and other elments from getting to the cups or cones from other openings in the frame.  length of 115 mm for the Italian threaded version.
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Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
105SCShimano1990 - 1999, Road RaceView 23 Components
Details:  in 1990 Shimano 105 was renamed to 105SC group. When the group received a makeover moving away from the polished aluminum finish to a painted silver finish. It would retain 7 Speed as it was introduced a year before with the 1051 group.  Dual pivot brakes were also introduced at the time. Before its demise in 1998 105SC would receive 8 Speed cassettes and STI shifters.

It was replaced with 9 Speed 105 (5500 Series) in 1999
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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