People like tech derails re bikes so here you are:
Bikes are a 16 year old Dawes Galaxy (steel of course) and a Mercian from 1979 (do.).
Drop bars, 700C, triple ring, usual road touring spec.
Ortlieb panniers (4) & a bar bag etc.
Camping kit carried whole way even tho using cheap hotels half the way. 21 kg or so on each bike plus rider!
Marathon tyres. Steve has a Shimano hub dynamo to charge his phone using a DC/AC converter.
Maps - one for each country so little detail plus Bikeline guides for the Elbe and Danube sect. 3.