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Bike Tire Sizes Explained: Inches, ISO, ETRTO and 700c
Learn how to read bike tire sizes: what inch, ETRTO and 700c markings mean, why 29 inch and 700c share a rim, and which number decides if a tire fits.
Tires
Tire Sizing
7 guides, starting with Bike Tire Sizes Explained: Inches, ISO, ETRTO and 700c.
650b Tires: What They Are and When to Choose Them
650b explained: a 584 mm rim also called 27.5 inch, how it compares with 700c and 26 inch, why gravel bikes use it, and whether it fits your frame.
Bike Tire Size Chart: Every Common Size at a Glance
A quick bike tire size chart listing common wheel sizes, ETRTO bead seat diameters, typical widths and bikes, plus how to read markings like 700x28c.
Choosing a Bike Tire Size for Your Height
How rider height relates to bike wheel and tire size: approximate kids' wheel sizes by height, adult options, fat bike widths and what ETRTO means.
Converting Between Inch, Metric and ETRTO Tire Sizes
Convert bike tire sizes between inches, millimeters, French and ETRTO systems, with worked examples, a width table and notes on why conversions are approximate.
How to Find and Measure Your Bike Tire Size
Find your bike tire size from the sidewall, or measure width and diameter by hand when markings are worn. Includes 24 vs 26 inch and 28 inch vs 700c answers.
What 700c Really Means (and What Fits It)
What 700c means, its 622 mm rim size, how it relates to 29 inch, 28 inch and 27 inch wheels, plus typical tire widths and what fits road and gravel bikes.
Related topics
More in tires
Tire Width & Fit 6 guides, starting with Road Bike Tire Sizing: How to Pick the Right Size. Tire Anatomy & Choice 6 guides, starting with Anatomy of a Bike Tire: Every Part Explained. Tire Pressure 7 guides, starting with Bike Tire Pressure Chart: Finding Your PSI. Inflating Tires 7 guides, starting with How to Inflate a Bike Tire Properly. Flat Tires 4 guides, starting with Why Your Bike Tire Keeps Going Flat and How to Stop It.