Sheldon Brown's Bicycle Tire Crib Sheet
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| 12 1/2 x Anything | 203 ISO | Juvenile, scooters | |
|---|---|---|---|
| 16 x Decimal | 305 ISO | Juvenile, BOB Trailers, some folders | |
| 16 x Fraction | 349 ISO | Folders, older Moulton | |
| 17 x Fraction | 369 ISO | Alex Moulton | |
| 18 x Decimal | 355 ISO | Birdy Folders | |
| 20 x Decimal | 406 ISO | Common BMX size, Trailers, recumbents | Commonly Confused Sizes! |
| 20 x Fraction | 451 ISO | Bike Friday, some recumbents | |
| 22 x 1 3/8" | 490 ISO | French 550A old French folders | |
| 24 x Decimal | 507 ISO | Juvenile MTBs | |
| 24 x 1, 1 1/8" | 520 ISO | Modern Terry Front | |
| 24 x 1 1/8" 24 x 1 1/4" 24 x 1 3/8" |
540 ISO 541 ISO |
Older Terry, Juvenile, French | Commonly Confused Sizes! |
| 24 x 1 3/8 S-* | 547 ISO | Schwinn Size | |
| 26 x Decimal | 559 ISO | MTBs, Cruisers, Fatbikes | |
| 26 x 1 3/8" E.A.3 | 590 ISO | 650A English 3-speeds, others | Commonly Confused Sizes! |
| 26 x 1 3/8 S-6 | 597 ISO | Schwinn Size, also English 26 x 1 1/4" | |
| 26 x 1 1/2" | 584 ISO | 650B | |
| 26 x 1 3/4" S-7 | 571 ISO | Schwinn Size - wide. | |
| 26 x other fraction | 571 ISO | 650C triathlon, time trial - narrow. | |
| 27 x anything | 630 ISO | Older derailleur-equipped bicycles | |
| 27.5 x anything | 584 ISO | Marketing name for wide 650B: MTBs. | |
| 28 x 1 1/2" | 635 ISO | 700B, English/Chinese/Indian rod-brake roadsters | Commonly Confused Sizes! |
| 28 x any other fraction | 622 ISO | 700C-"28 inch" designation is used in Germany and northern Europe |
The more common sizes are shown with a white background, the less common varieties are shown with a gray brackground.
This page is intended as a quick reference primarily for the benefit of folks in the bicycle business. Feel free to print it out, but please don't reproduce it without proper credit and linkage.
Last Updated: by Harriet Fell