I have a old mountain bike that I want to convert into a commuter bike. It currently has knobby tire on it so I want to change it out for this one: Forté Gotham ST Road and Mountain Tires, 700 x 32, 700 x 35, 26 x 1.75

Is this tire good?
Is Find Bikes, Cycling Clothing, Bike Parts & Bike Shoes Or Your Local Bike Store at Performance. a good place to shop at?
It says "26x1.75" but my bike's current tires say "26x1.90", it won't fit?