Few days between Strasbourg and Frankfurt - what to see?

[LittleWheelsandBig]

An Aussie friend has been slowly making his way from Lisbon towards Germany for several weeks. I aim to join him for a few days from 03 June, probably using trains to Strasbourg and trains from Frankfurt. I may take my S&S bike but more likely a Birdy Blue. Either can fit into a Eurostar-compliant bag and changing at Lille seems the sensible option.

Philip isn't looking for huge distances (50 to 80ish km daily) or hunting cols. I enjoy checking out history, trains, bridges, what have you. I expect to be staying at cheap hotels or suchlike, rather than camping.

What are some things to look for/ visit along the way?

[Rod Marton]

Between Strassburg and Frankfurt would be mostly along the Rhine valley, which to be honest isn't the most scenic part of Germany. The two obvious places to visit on the way would be Karlsruhe and Heidelberg. The centre of Karlsruhe has lots of classical architecture and an enormous palace; Heidelberg is well-known and consequently rather touristy. Personally I prefer small towns in Germany, and whilst the Rhine valley has plenty of small towns they aren't particularly scenic. However if you don't mind a bit of a detour Bad Wimpfen and Mosbach are both very pretty places, and you may well find some other nice towns on the way.

[yorkie]

There is a transport museum in Speyer, which is more or less on the way. https://speyer.technik-museum.de/ is their website.

Somewhat more of a niche interest, just south of Speyer at Germersheim, there is the German road making museum.
https://www.das-deutsche-strassenmuseum.de/

[Deano]

Frankfurt is - well, Frankfurt, expect financiers

The riding around is decent though, especially Taubertal even if it's in the wrong direction (south east), it's all lovely riding and full-on Bavarian clock tower country

[T42]

West of Strasbourg there are the Vosges, and in particular Haut-Koenigsbourg, which is worth a dekko.  It's a mediaeval castle that was entirely renovated in the early 1900s by order of Queen Vicky's cousin.  There's a decent climb up to it, around 500m over 8 km. Coming down again is fun too.

And of course you're always welcome to drop in...