Tire sizing systems
ETRTO vs TRA Tire Standards: Understanding the Differences
A guide to ETRTO and TRA tire standards, explaining how to read tire size markings, compare dimensions, and interpret load and inflation tables for correct fitment.
ATV Inner Tube Size Chart: How to Read Tire Sidewall Markings
Learn how to read ATV tire sidewall numbers and match them to the correct inner tube size. Covers width, aspect ratio, rim diameter, tube size ranges, and valve stem fitment.
Bicycle Fractional vs Decimal Tire Sizes: Are They Interchangeable?
Learn how to read bicycle tire sidewalls, understand fractional and decimal inch sizing, and determine whether tires with different markings are interchangeable based on ISO/ETRTO dimensions.
Tire and Rim Association Standards: Understanding Tire Sidewall Markings
Learn how to interpret tire sidewall numbers and markings according to Tire and Rim Association (TRA) standards. Understand width, aspect ratio, rim diameter, and how to compare tire sizes.
Wheelchair Tire and Wheel Size Chart: Reading Sizes, Diameters and Widths
How to read wheelchair and mobility scooter tire sizes: inch and ETRTO markings, caster sizes, widths, calculated diameters, conversions, and the limits of fitment.
Trailer Tire Size Charts: How to Read, Convert and Compare Trailer Tire Sizes
Learn to read trailer tire sidewall numbers, convert metric and inch sizes, calculate diameter and compare ST, boat, caravan, utility and mobile home tire sizes.
ETRTO Tire Standards: What They Cover and How to Use Them
What ETRTO tire standards cover, how to read sidewall markings such as 205/55 R16 91V, and how to calculate and compare sidewall height, diameter and circumference.
Wide-Base Truck Tire Sizes and Dimensions: How to Read and Compare Them
How to read wide-base truck tire sizes such as 445/50R22.5 and 455/55R22.5: what the sidewall numbers mean, how to calculate sidewall height and overall diameter, and where those calculations stop being reliable.
How to Measure Bicycle Tire Size: From Sidewall Markings to Mounted Width
How to read the size on a bicycle tire sidewall (ETRTO, 700c and inch sizes), measure mounted tire width with calipers, and estimate diameter and circumference.
JATMA Tire Standards: Reading Sidewall Numbers, Rim Dimensions and Load-Inflation Tables
How to read tire sidewall numbers under JATMA tire standards: size designations, aspect ratio, rim diameter, load index, speed symbol, rim dimensions and load-inflation tables, with diameter and circumference calculations.