Nov 4, 2017 - 12:55 AM
in reply to LorraineS
You can make the reservation on the Deutsche Bahn site, and when searching for connections, tick the option that says "Only show connections that allow carriage of bicycles (buy bicycle ticket if necessary)".
It seems that it's only possible to reserve bicycle places in long distance trains, designated as "IC" or "EC". In regional and local trains, it's apparently a case of "first come, first served", and if there were no place for your bikes, you would need to wait for the next train. Deutsche Bahn recommends not choosing connections during commuter travel times and long weekends if you want to ensure room for your bike on your preferred train. The time of year you are travelling would also make a difference.
If you choose connections with only one transfer en route, and an IC train as the first connection (with reserved places for your bikes), that is likely to work out best I would think.