Jeff,
Assuming a sort of straight line from Wales thru southern Germany, it's ~850
miles between, e.g. Bristol UK to Munich.
There are many more BMW dealers in Germany; they're likely to have tires,
and all parts necessary, even if paying "more" than an independent
You're also riding in height of season, so advance appointment likely
necessary, to match your itinerary/ schedule with dealer availability.
All BMW dealers in Germany listed here:
BMW Motorrad Deutschland,
(click on "Ihr BMW Partner" brings up map; clicking on region brings up
dealer list & contact info).
Specific suggestion from personal experience:
Fahrzeughaus Stilgenbauer GmbH & Co. KG
Von-Humboldt-Str. 7
64646 Heppenheim
Tel.: 06252 75355
Homepage:
BMW Motorrad Stilgenbauer | Startseite
(southbound from Frankfurt, just off main autobahn A5; does most of the
work for Yank riders keeping bikes in Heidelberg at
www.knopftours.com)
call ahead for appt. availability
but there are many to choose from
or
get your service work done in Wales/ UK before you leave
or
dealers also throughout Austria
BMW Motorrad Österreich
or, even wait and get your service done by BMW dealer in
Turkey/ Istanbul
Borusan Otomotiv İthalat ve Dağıtım A.Ş
İstinye Mah. Sarıyer Cad. No.77 , 34460 Sarıyer, İstanbul
+90 212 359 30 60
info@bmw-motosiklet.com
BMW Motorrad Türkiye
good luck