In Riga I like Velo Bikeri. It's a small shop owned by two guys, Andis who is an ex-racer and Vlads who is a DHer. They have good service, excellent prices, fast special orders, and it's the kind of place where you can stop in for a chat and all the neighborhood boys flock to after school. They also do things like swap out tires on new bike purchases for free. This doesn't often happen here in Riga. All in all it's what an LBS should be.
Velo Bikeri
Bikernieku 57
Riga
7546 813
http://www.velobikeri.lv