I know everyone in Montreal has their own bicycle shop, and they are all really great after it's MTL and we live to ride!!! But in the Plateau Jr Bicycletterie is like a pit stop along the bike path to the Parks. The staff is cool, but not too cool to talk to you, and the selection from bells to bikes is on point! I've shopped there before for pedals and other stuff but recently blew a tire, I bought a $6 inner tube and it ripped at the seam, I went in without my receipt, this may not be cool all time so caveat your emptor, but I got a better one, no questions asked.
***They restored my faith in humanity man!***
If you like bikes or even if you don't, this place deserves a walk through and a 'hey man, how's it going' and the karma will flow right back..
Bonus: Free air pump outside on the way to and fro to Park Mont Royal or Park La Fontaine on Rachel.