Finding out which wheelchair replacement tire you need is the same method you use to find a replacement tire for a car or bicycle. You may need a flashlight to see the size and style number on the side ribbon of your existing tire. Like on a bicycle tire, the numbers should read something like 23 x 1-3/8" or 24 x 1". Copy the numbers on the tire on a piece of paper or your cell phone before contacting the manufacturer to reorder.
If you want to shop for wheelchair replacement tires, online medical equipment supply retailers like Allegro Medical can offer the replacement tire you need at guaranteed low prices. For example, Allegro Medical has High-Performance Primo Racer Wheelchair Tires (24 x 2"). It also offers a broader range of wheelchair safety products and supplies. Allegro Medical also offers the Best Price Guarantee and superb customer service.