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Sheldon Brown's Bicycle Tire Crib Sheet

12 1/2" x Decimal 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
26 x 1 3/8" E.A.3 590 ISO 650A English 3-speeds, others Commonly
Confused
Sizes!
26 x 1 3/8 S-* 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-* 571 ISO Schwinn Size
26 x other fraction 571 ISO 650C triathlon, time trial
27 x anything 630 ISO
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.

For more detaied information, see my Article on Tire Sizing

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More cribsheets: Click here!

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.

Spoke Divider

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Last Updated: by Harriet Fell