Tire sizing systems
700c and 29-Inch Bicycle Tires: Sizes, Markings and Real Differences
700c and 29-inch bicycle tires both fit a 622 mm bead seat diameter rim. Learn to read sidewall markings, compare widths and diameters, and see where fitment limits apply.
Mobility Scooter Tire Size Chart: Reading the Numbers on the Sidewall
How to read mobility scooter tire sizes such as 3.00-4, 4.10/3.50-4, 13x5.00-6, 260x85 and 62-203. Includes a size chart, diameter and circumference calculations, and why a matching size alone does not prove fitment.
Truck Tire Chain Sizes: Matching Chains to Tire Markings
How to read commercial truck and bus tire sidewall sizes, compare width, aspect ratio and rim diameter, and use a truck tire chain size chart for single, dual and wide-base tires.
Industrial Solid Tire Sizes and Dimensions Explained
How to read industrial solid tire sizes for press-on and pneumatic-shaped tires, what each sidewall number means, how to calculate diameter and circumference, and where the calculation stops.
What Is Considered a Low-Profile Tire on Commercial Trucks and Buses?
How to tell whether a commercial truck or bus tire is low profile from its sidewall numbers, with aspect ratio explained, common sizes, and simple sidewall, diameter and circumference calculations.
Loader Tire Sizes: How to Read Markings, Use Size Charts and Convert Inch and Metric Sizes
How to read loader tire size markings such as 23.5R25, 750/65R25 and 12-16.5, convert between inch and metric sizes, and calculate sidewall height, overall diameter and circumference.
Space-Saver and Collapsible Spare Tire Sizes Explained
How to read temporary spare tire size markings such as T135/80D16 101M, calculate compact spare dimensions, and compare a space-saver with your regular tire.
Aircraft Tire Sizing Systems: How to Read Size Markings
How to read aircraft tire size markings: Type III, Type VII, three-part and metric systems, rim diameter, ply rating, speed rating and simple geometry math.
Bus Tire Sizes and Dimensions: Reading the Numbers on the Sidewall
How to read bus tire sizes such as 275/70R22.5 and 11R22.5, separate dimensions from load and speed ratings, and calculate sidewall height, overall diameter and circumference.
RC Car Tire and Wheel Sizes Explained: Dimensions and Size Charts
How to read RC tire sizes: bead diameter, outer diameter, width, hex and offset, plus size charts for crawlers, buggies and touring cars, with sizing calculations.