German Motorcycle Resources

VFV
Automobile and Motorcycle Association, Germany. Their site claims that it is the world's largest motorcycle forum.
veteranen-fahrzeug-verband.de

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Automobilia 85-45
Considerable information on automobile and motorcycle production in Germany and elsewhere.
automobilia8545.de

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meisterdinger.de
Documents vintage motorcycles made in Nuremberg.
more information...

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GTU
Large database of German manufacturers.
GTU

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IG-JLO-Twin
Masses of information on the JLO twin cylinder engines fitted to a good many European marques. The site went off-line in 2019, but a fairly complete archive exists at the Wayback Machine.
ig-jlo-twin.eu

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Motorräder aus Leipzig
Documents vintage motorcycles made in Leipzig including several ongoing restorations.
motorräder-aus-leipzig.de

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motor-lit-berlin.de
Literature on many German marques.
motor-lit-berlin.de

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das-leichtmotorrad
Brochures and sales literature on many German marques.
motor-hist-foto.de and das-leichtmotorrad.de are the same.
das-leichtmotorrad.de FB Group Motorräder, Zeitdokumente , Fotos
Motorräder, Zeitdokumente , Fotos

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deacademic com
Russian site which borrows extensively from authoritative sites.
deacademic com

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Marque Specific

D-Rad
d-rad.ch
d-rad.de

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Denia
Horst Mennig submitted information on a previously undocumented German marque
Denia

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DKW
DKW Motorrad Club has a wealth of information, very well presented.
dkw-motorrad-club.de

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Maico
Maico at OzVMX Forum
Maico FB Group

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NSU
Volker Bruse

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Walter
Walter

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TWN-IG
A comprehensive and well presented site on Triumph Werke Nurnberg
TWN-IG

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TWN Zweirad IG
Regio Schweiz

TWN Zweirad IG

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Tornax

tornaxig.de

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Victoria

kr26.de

victoria-ig.de

victoria-rad.de

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Zundapp

zundapps.com
Compiled by Michael Keefe and Mike Dunn, this is a well-presented collection of detailed model information on pre-war Zundapp motorcycles including catalogues, parts books and articles. zundapps.com

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ZundappFool
Large collection of technical information amassed over three decades. Zundapp Fool

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Zundapp KS601
Technical information, specifications of flat twin. zundappks601.com

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Photographs made at the DKW Motorrad Club e.V.

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Translations

German translations (word only, not phrase)
by Oxford University
en.bab.la/dictionary

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This was a source for many early posts here which have for the most part been verified and corrected, or deleted:
German motorcycles, microcars and sidecars - JF