Boston Bike Shops

[newfsmith]

This is the closest to what you asked for. http://backbaybicycles.com/page.cfm?pageID=331
If you go across the river to cambridge there are a number of options:
http://www.cambridgebicycle.com/
http://broadwaybicycleschool.com/
http://www.atabike.com/
Or you can take the Orange line to Green St in Jaimaca Plain, and go to the Bikes-not-Bombs shop. If your bike is rideable, you can ride down the Southwest Corridor Path to get there. http://bikesnotbombs.org/bikeshop If you are looking for a new bike, http://www.ferriswheelsbikeshop.com/ is not far from BNB.