Home How2Buy Helmets Children Promotions Pamphlets Statistics Laws Standards
Quick New Briefs Services Press Links Sitemap Search Translate

Bicycle Helmet Safety Institute

Bicycle Helmet Sizing




Summary: A helmet sizing chart with US hat size matched up with head circumference.




To find your approximate helmet size, measure around your head just above the eyebrows and use the table below. This is an approximate chart. Manufacturers do not always use the same size labels for a given circumference, and some are creative with small/medium or medium/large labels.

In addition to sizes, helmet shapes vary among manufacturers. You will have to try the helmet on to determine if it fits the shape of your head. A helmet that is fitted and adjusted properly should feel snug but not tight, and should not move from side-to-side or front-to-back. Expect to spend a good fifteen minutes playing with fitting pads and straps to get the best fit. You will be repaid for years with a comfortable helmet. We have some advice on fitting if you need it.


Sizing

Hat
Size
Circumference
(Inches)
Circumference
(mm)
Approximate
Size
XXXXS18.11460Smallest helmets made.
XXS18 1/2470Toddler
619483
6 1/819 3/8492
6 1/419 3/4502
6 3/820 1/8511
6 1/220 1/2521
6 5/820 7/8530Small
6 3/421 1/4540Medium
6 7/821 5/8550
7 22 559
7 1/822 3/8568
7 1/422 3/4578Large
7 3/823 1/8587
7 1/223 1/2597
7 5/823 7/8606
7 3/424 1/8616Largest helmets usually available.
7 7/824 5/8625
825635
8 1/825 3/8644
8 1/425 3/4654Bell Kinghead (discontinued)
8 3/826 1/8663 Largest helmet on our Big Heads page.
8 1/226 1/2673No known model.


See our page on big heads for more.


Here is a similar chart from Bell Sports, from one of their old catalogs:

2006

Circumference Hat Size
(Bell's)
Nominal Size
20 1/26 1/2Toddler
20 3/46 5/8Small
21 1/46 3/4Medium
21 5/86 7/8
227
22 3/87 1/8
22 3/47 1/4Large
23 1/87 3/8
23 1/27 1/2
23 7/87 5/8
24 1/47 3/4
24 3/47 7/8
25 7/88 1/4Bell Kinghead



For BMX helmet manufacturers here is a page of comparative sizing that may be helpful.


This page was last revised on: October 25. 2010.

Contact us.

Home How2Buy Helmets Children Promotions Pamphlets Statistics Laws Standards
Quick New Briefs Services Press Links Sitemap Search Contact