Marta

I live in Arlington like NYBiker, but in the North part (closer to DC than to PG county). Welcome to the forum!

I'm 5'5" too and can ride bikes ranging from 47 - 50 cm. It all depends on the bike. As others have recommended, make sure you feel comfortable on the bike before you buy it. You might to try several before deciding to buy one.

Don't forget to get a helmet!!!