So I bought two Kenda K40 26-1 3/8 (590-37) tires from Canadian Tire for my old Schwinn 1990 Mirada since I gave my two Schwalbe Marathon Plus to my wife for her Mirada. I wanted to use my old bike when we ride together. Turns out, they are way too big. Why two different 26" sizes (559 and 590)?!?

I ended up buying two Schwalbe Marathon 26" (559-40) touring tires from ChainReactionCylce instead.