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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.

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

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

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

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

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

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

If you're looking for some of the more obscure bicycle tire sizes, here's a more comprehensive list of ISO rim and tire sizes.

ISO Conventional Size Application
635mm 28x1 1/2, 700B Commonly used in Asia and the Netherlands for utility bicycles.
630mm 27 x anything Older road bikes.
622mm 700C, 29inch Modern road bikes, hybrids, 29" mountain bikes.
599mm 26x1.25, 26x1.375 Very old US lightweight bicycles.
597mm 26x1 1/4, 26x1 3/8 (S-6) Older British bikes, Schwinn lightweight bikes from the 60s and 70s.
590mm 26x1 3/8 (EA3), 650A 3-sp department store bikes, children's 10sp bikes, Italian high performance bikes for smaller riders.
587mm 700D Unusual size once used on some GT bikes.
584mm 26x1 1/2, 650B, 27.5" Some Raleigh and Schwinn mountain bikes, French utility and touring bikes, some new 27.5" mountain bikes.
571mm 26x1, 26x1 3/4, 650C Old Schwinn cruiser bikes. 650C size used for modern high performance road bikes for smaller riders and triathlon bikes.
559mm 26x1.0 to 26x2.5 Many modern mountain bikes and cruisers.
547mm 24x1 1/8, 24x1 3/8 (S-5) British and Schwinn children's bikes.
540mm 24x1 1/8, 24x1 3/8 (E5), 600A Commonly used on wheelchairs. Also used on British children's bikes.
520mm 24x1, 24x1 1/8 Used for front wheel on some Terry bicycles.
507mm 24x1.5 to 24x2.5 Children's mountain bikes and cruisers.
490mm 550A European children's road bikes.
457mm 22x1.75 to 22x2.125 Children's bikes.
451mm 20x1 1/8, 20x1 1/4, 20x1 3/8 Some recumbent bikes, children's lightweight bikes and some BMX bikes.
440mm 500A European children's bikes and folding bikes.
419mm 20x1 3/4 Schwinn children's bikes.
406mm 20x1.5 to 20x2.25 Most BMX bikes, some recumbents.
390mm 450A European children's bikes.
369mm 17x1 1/4 Alex Moulton bikes.
355mm 18x1.5 to 18x2.125 Used on Birdy folding bike made by Burley.
349mm 16x1 3/8 Original Moulton bikes from the 60's.
340mm 400A European children's bikes.
317mm 16x1 3/4 Schwinn children's bikes.
305mm 16x1.75 to 16x2.125 Some recumbents, children's bikes, trailers.
203mm 12 1/2 x anything Scooters, children's bikes.
152mm 10x2 Wheelchair tire.

Please note: while this list is quite comprehensive, there are many sizes above that are increasingly difficult or impossible to source. As such, we cannot guarantee availability for all listed sizes.

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