VFV
Automobile and Motorcycle Association, Germany. Their site claims that it is the world's largest motorcycle forum.
veteranen-fahrzeug-verband.de
Automobilia 85-45
Considerable information on automobile and motorcycle production in Germany and elsewhere.
automobilia8545.de
meisterdinger.de
Documents vintage motorcycles made in Nuremberg.
more information...
GTU
Large database of German manufacturers.
GTU
Oldtimerclub Lachendorf
Details of German three-wheelers, microcars and automobiles.
oldtimerclub-lachendorf.de
motor-lit-berlin.de
Literature on many German marques.
motor-lit-berlin.de
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
Marque Specific
Denia
Horst Mennig submitted information on a previously undocumented German marque
Denia
DKW
DKW Motorrad Club has a wealth of information, very well presented.
dkw-motorrad-club.de
Maico
Maico at OzVMX Forum
Maico FB Group
NSU
Volker Bruse
Victoria
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
ZundappFool
Large collection of technical information amassed over three decades.
Zundapp Fool
Zundapp KS601
Technical information, specifications of flat twin.
zundappks601.com
motomuseum-hostalek.cz
Images and specifications for a number of Zundapp models.
South-Bohemian MC Museum
German translations (word only, not phrase)
by Oxford University
en.bab.la/dictionary
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