We plan to do a self guided bike tour around Lake Constance this year. Looking for suggestions for the best tour company to go with. We ride a tandem bike so we will need a company that rents tandems. Also best month to avoid rain? Thanks much!
Found this one with Google:
https://www.biketours.com/tools/tags/tandem-bikes-available/
Scroll down for their Lake Constance self-guided trip.
Bike rentals:
https://www.lake-constance.com/en/what-to-do/active/cycling/rental
Have a look at this. Three days is an aggressive schedule, if you want to see some of the sites and villages, but it gives you a good idea.
https://sunsetobsession.com/cycling-lake-constance/
Full service, they look after luggage for you as well:
https://www.cycling-lake-constance.com/luggage-transfer-service
We've used this company twice. https://www.radweg-reisen.com/
1st time around Lake Constance over 7 days - was one of our favorite things we've ever done in Europe. We also used them to bike the Mosel from Metz France to Koblenz Germany.
Here is another, no personal experience but I have heard good things.
However, like the company recommended above (Radwegs), they do not mention tandem bikes. You may be able to contact both companies and ask about availability.