The Meaning of Wheelchair Tire Sizes
EXAMPLE 1 2.80/2.50-4" Wheelchair Tire
Tire sizes are typically written in this format for rehabilitation industry on applications such as wheelchairs and mobility scooters. Examples include 2.80/2.50-4", 4.10/3.50-4" , 4.10/3.50-5" 4.10/3.50-6".
2.80" = Refers to the width of the tire;
2.50" = Distance from the outside edge of the tire to the rim;
4" = Diameter of the rim;
In this case, the diameter of the tire is not mentioned. To get the diameter of the tire, add the 2.50" (edge of the tire to the rim)+ 4" (diameter of the rim)+ 2.50" (rim to the edge of the tire) = 9 inch.
Please note that sizes in the tire industry are not exact. A 2.80/2.50-4" tire is typically around 8.6" in overall diameter. However, it will still be considered a 2.80/2.50-4" tire as it meets the industry standards.
EXAMPLE 2 13x5.00-6" Tire
Tire sizes are typically written in this format for rehabilitation and lawn and garden industry on applications such as electric wheelchairs, mobility scooters, lawn mowers, ZTRs, ATVs, large roofing tires, etc. Examples include 9x3.50-4”,13x5.00-6",and 14x3.50-8.
13" = The diameter of the tire;
5.00" = The width of the tire;
6" = The diameter of the rim;
Through the years, tire dimensions have changed, but the size label has remained the same.
EXAMPLE 3 8x2 Tire
Tire sizes are typically written in this format for the lawn and garden industry on applications such as garden or trailer carts. All Semi-Pneumatic tires are written this way as well.
Examples include 24x1", 8x2", 6x2", etc.
The overall tire size is typically written along the sidewall of the tire.
8" = The diameter of the tire;
2" = The width of the tire;
In this case, the diameter of the rim is not mentioned.
While semi-pneumatic sizing is not exact, it is often much closer to the size indicated than Flat Free or Pneumatic tires are.
