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version of these pages.

1. Measurement

Measuring the head is a starting point for the entire sizing procedure. Due to varying shapes, heads that are apparently the same size when measured by a tape may not necessarily fit the same size helmet.

A small metal tape measure, or a cloth tape may be used to make your initial measurement.

The circumference of the head should be measured at a point approximately one inch above the eyebrows in front, and at a point in the back of the head that results in the largest possible measurement. Take several measurements, to make sure you have the largest one.

PLEASE NOTE THAT THIS IS A ROUGH GUIDE AND NOT EXACT. THE SHAPE OF YOUR HEAD IS AS IMPORTANT AS THE MEASUREMENT WHICH MAY AFFECT FINAL FIT!

Size Cross Reference

Motorcycle Helmet Sizing Chart

YOUTH HELMET SIZE HEAD CIRC. (IN) HEAD CIRC. (CM) HAT SIZE
Youth S/M 19 1/4" - 19 3/4" 49cm - 50cm 6 1/8 - 6 1/4
Youth L/XL 20" - 20 1/2" 51cm - 52cm 6 3/8 - 6 1/2


ADULT HELMET SIZE HEAD CIRC. (IN) HEAD CIRC. (CM) HAT SIZE
XS 20 7/8" - 21 1/4" 53cm - 54cm 6 5/8 - 6 3/4
SM 21 5/8" - 22" 55cm - 56cm 6 7/8 - 7
MD 22 3/8" - 22 3/4" 57cm - 58cm 7 1/8 - 7 1/4
LG 23 1/4" - 23 5/8" 59cm - 60cm 7 3/8 - 7 1/2
XL 24" - 24 3/8" 61cm - 62cm 7 5/8 - 7 3/4
XXL 24 3/4" - 25 1/4" 63cm - 64cm 7 7/8 - 8


Auto Helmet Sizing Chart

ADULT HELMET SIZE HEAD CIRC. (IN) HEAD CIRC. (CM) HAT SIZE
XXS 21 1/4" - 21 5/8 54cm - 55cm 6 3/4 - 6 7/8
XS 22 56cm 7
SM 22 3/8" 57cm 7 1/8
MD 22 3/4" - 23 1/8" 58cm - 59cm 7 1/4 - 7 3/8
LG 23 1/2" - 23 7/8" 60cm - 61cm 7 1/2 - 7 5/8
XL 24 1/4" 62cm 7 3/4
M3 XTRA 8 25 1/8" - 25 1/2" 64cm - 65cm 8
M3 XTRA 8 1/4 25 7/8" - 26 1/4" 66cm - 67cm 8 1/4
M3 XTRA 8 1/2 26 3/8" 68cm 8 1/2





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2650 E 28th St. - Signal Hill, CA 90755 - Phone: (800) 552-3678 - Fax: (562) 595-1113

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Extreme Supply is proud to be an authorized Bell dealer of Bell Motorcycle Helmets, Bell Bicycle Helmets, and Bell Auto SA rated helmets.
We are not affiliated with Bell Sports, Bell Powersports, or Bell Racing.