I own a Brodie Knack double suspension medium size arround year 2009 It is for XC
Is it possible for me to buy a new frame, a large one this time, and switch everything to this new frame ? If yes, where can I find discount/clearance frames for this ? Any web links ? I am base in Quebec/Canada
JensonUSA.com usually has some nice deals going on. Not too sure what frames they offer, I am usually searching through their parts section. Try sourcing from your LBS for people who are upgrading their rides. You may find a frame that someone else is going to part with.
if those all match your new frame, your good to go.
You'll also want to check the front wheel axle size and rear wheel axle size (in addition to the spacing) to be sure. You most likely have a 12mm quick release front and back and 135mm spacing in the back, but I'm not sure maybe Brodie was ahead of the times.