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Tire Size Chart

Tire Size Chart Header

Bicycle tires come in a variety of sizes and, with time, the International Organization for Standardization (ISO) has developed a universal system to better understand and regulate tire and rim sizing.

The tire size chart below includes bicycle tire sizes and how they are commonly written. Note that the "c" does not stand for centimeters; it's a holdover from an old French system that designated tire sizes using the letters a, b and c.

While this is a non-exhaustive list of all the bike tires out there, we encourage you to use this as a general guide to easily understanding bike tire sizing systems.

ROAD BIKE TIRES
ISO(mm) Conventional Name Inches
622 Modern Road Bike 700c 29
584 Vintage Randonneur 650b 26x1 1/2, 27.5
559 High Performance Time Trial 650c 26x1, 26x1 3/4

MOUNTAIN BIKE TIRES
ISO(mm) Conventional Name Inches
622 29 inch Mountain Bikes 700c 29
584 Modern MTBs 650b 26x1 1/2, 27.5
559 Classic Mountain Bikes 26x1.0 - 26x2.5

CRUISER/CITY BIKE TIRES
ISO(mm) Conventional Name Inches
622 Hybrid Bikes 700c 29
571 Older Schwinn Models 650c 26x1, 26x1 3/4
559 City Bikes 26x1.0 - 26x2.5
507 Cruisers 24x1.5 to 24x2.5

CHILDREN'S BIKE TIRES
ISO(mm) Conventional Name Inches
547 British and Schwinn Children's Bikes 24x1 1/8, 24x1 3/8 (S-5)
540 British Children's Bikes 600a 26x1 1/2, 27.5
520 Classic Mountain Bikes 26x1.0 - 26x2.5
507 Children's Mountain Bikes 24x1.5 to 24x2.5
451 Children's Lightweight Bikes 20x1 1/8, 20x1 1/4, 20x1 3/8
305 Children's Bikes 16x1.75 to 16x2.125
203 Children's Bikes 12 1/2 x anything

OTHER BIKE TIRES
ISO(mm) Conventional Name Inches
451 Some BMX Bikes 20x1 1/8, 20x1 1/4, 20x1 3/8
406 Some Recumbent Bikes 20x1.5 to 20x2.25
406 BMX Bikes 20x1.5 to 20x2.25
369 Folding bikes by Moulton 17x1 1/4
355 Folding bikes by Birdy 26x1, 26x1 3/4
349 Folding bikes by Moulton 16x1 3/8
305 Some Recumbent Bikes 16x1.75 to 16x2.125

NON-BIKE SPECIFIC TIRES
ISO(mm) Conventional Name Inches
540 Wheelchairs 600a 24x1 1/8, 24x1 3/8 (E5)
305 Trailers 650b 16x1.75 to 16x2.125
203 Scooters 650c 12 1/2 x anything

Please note we are unable to stock certain tire sizes at this time

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