Shimano Tourney
Main Photo
Category:  Rear Derailleurs
Name:  Shimano Tourney
Brand:  Shimano
Primary Group:  Tourney
Model:  DB 300
Years:  1975 - 1979
Country:  Japan
Weight:  300 grams (Spec)
Added By: tmundry67 on 09/07/17
Updated By: tmundry67 on 09/07/17
Additional Photos - click for full size
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 Verify Component Photos
Outer Plate MarkingsShimano TourneyInner Plate Markingsnone
MaterialAluminum Alloy; SteelDesign CategoryDrop Parallelogram
Attachment Bolt Size6mm Allen KeyCable Attachment Bolt Size9mm Wrench
Shifting SystemsFrictionCable AdjusterNo
Cage LengthShortMax Cog Size28
Max Chain WrapFront difference: 14 teeth  
General Information
An early or maybe 1st version of the Tourney derailleur product line, appears the first time in 1975 Shimano catalogue. Total capacity not given in catalogues from 1975 to 1979. Was already designated to have the "servo panta mechanism", which keeps the guide pulley always in same difference to the rear sprocket Independent of size and sequence of sprockets.
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Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
TourneyShimanoView 3 Components
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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