Please allow me to recommend the Cave à bières à Rennes : Chez Alain.
The French are more into drinking wine, but this shop does beer a lot of justice.
They have around 350 varieties of beer, both imported and domestic.
It also has a small bar situated on site. What more do you need?
Cave à bières à Rennes : Chez Alain
Une large gamme de bières ...
Thanks to Ken Graham.
After returning from Brittany, I can say that Chez Alain was a good choice, but a little too international.
I discovered Le marchand de biere in Rennes, not too far from Chez Alain, which I preferred for a larger choice of only local beers.