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Sheldon Brown's Bicycle Metric Dimension Crib Sheet


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3/32" 2.38 mm Chain/chainring width for most derailer-equipped bikes
1/8" 3.175 mm Bearing balls: freewheels, some headsets, some pedals
Chain/chainring width for most one-speed bikes (frequently rounded to 3 mm)
5/32" 3.970 mm Bearing balls: many headsets, many pedals
3/16" 4.763 mm Bearing balls: most front hubs (10 x 2) many headsets
7/32" 5.556 mm Bearing balls: high end Campagnolo front hubs (9 x 2)
1/4" 6.35 mm Bearing balls: almost all rear hubs (9 x 2)
Most bottom brackets (11 x 2)
5/16" 7.937 mm Bearing balls: bottom brackets for one-piece-cranks.
13/16" 21.15 mm BMX & OPC Stems, seatposts
7/8" 22.2 mm Upright handlebars (grip section), 1" stem quills, BMX Seatposts
15/16" 23.8 mm Drop handlebars (grip secction)
1" 25.4 mm ISO handlebar clamp size, standard top tubes.
1.024" 26.0 mm Italian handlebar clamp size, many higher-end road bars.
1.039" 26.4 mm Old Cinelli handlebar clamp size
1 1/16" 27.0 mm
1 1/8" 28.6 mm Standard steel seat tubes, down tubes, O.S. top tubes
1 1/4" 31.8 mm O.S. seat tubes, O.S. handlebar clamp size, others
1 3/8" 34.9 mm O.S. seat tubes, others
19" 48.3 cm Frame sizes listed in inches are most often "center to top."
20" 50.8 cm
21" 53.3 cm
22" 55.9 cm
23" 58.4 cm
24" 61 cm
25" 63.5 cm

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