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Shimano BB UN-90
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Category:  Bottom Brackets
Name:  Shimano BB UN-90
Brand:  Shimano
Primary Group:  XTR M900
Model:  BB UN-90
Years:  1992 - 1993
Country:  Japan
Weight:  240 grams
Added By: movinyl on 07/15/13
Updated By: movinyl on 07/15/13
Additional Photos - click for full size
Shimano BB UN-90Shimano BB UN-90Shimano BB UN-90
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Bearing Size/Count per sideCartridgeSpindle Markings
Fixed Cup MarkingsAdjustable Cup Markings
Spindle StyleSquare Taper (JIS)Axle MaterialSteel
Available ThreadingsEnglish/ISO: 1.370 x 24Length(s)107mm
Tools Needed  
General Information

Shimano UN 90 Bottom Bracket. Spindle Lenght: 107mm. 68mm Bottom Bracket Shell. JIS Taper.

The UN-90 Bottom Bracket was part of the first "race-oriented" Shimano XTR group (8-speed). Sealed cartridge type BB that was also used on road bikes at the time. The UN-90 was succeeded a year later by the UN-91 bottom bracket specifically developed for the XTR and Dura Ace group.
Quality:Rarity:
 
 
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Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
XTR M900Shimano1992 - 1995, Mountain BikeView 14 Components
Details:  Designed to be a complete race oriented mountain bike group, the new 8sp SIS compatible XTR series was introduced in 1992.  A slight upgrade with M910 series parts was released in 1995 before the group was completely upgrade in 1996 with the introduction of the M950 series.
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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