Down tube
Unterrohr is the place name of
- Unterrohr (Kammeltal) , part of the municipality Kammeltal , district of Günzburg, Bavaria
- Unterrohr (Pocking) , district of the town of Pocking , Passau district, Bavaria
- Unterrohr (municipality of Rohr bei Hartberg) , cadastral municipality of the municipality of Rohr bei Hartberg , Hartberg-Fürstenfeld district, Austria
On the bicycle frame , it is one of the main pipes.