Skip to content
100Percent Mountain Bike Helmet Size Chart
Model |
XS |
S |
M |
L |
XL |
XXL |
Aircraft |
53 – 54cm |
55 – 56cm |
57 – 58cm |
59 – 60cm |
61 – 62cm |
63 – 64cm |
20⅞” – 21¼” |
21⅝” – 22″ |
22½” – 22⅞” |
23¼” – 23⅝” |
24″ – 24⅜ “ |
24¾”- 25¼” |
Aircraft Carbon MIPS |
53 – 54cm |
55 – 56cm |
57 – 58cm |
59 – 60cm |
61 – 62cm |
63 – 64cm |
20⅞” – 21¼” |
21⅝” – 22″ |
22″ – 22⅞” |
23¼” – 23⅝” |
24″ – 24⅜ “ |
24¾”- 25¼” |
Status |
53 – 54cm |
55 – 56cm |
57 – 58cm |
59 – 60cm |
61 – 62cm |
63 – 64cm |
20⅞” – 21¼” |
21⅝” – 22″ |
22″ – 22⅞” |
23¼” – 23⅝” |
24″ – 24⅜ “ |
24¾”- 25¼” |
Trajecta |
|
52 – 56cm |
56 – 58cm |
58 – 61cm |
61 – 64cm |
|
|
20½” – 22″ |
22″ – 22⅞” |
22⅞” – 24″ |
24″ – 25¼” |
|
100Percent Trail Bike Helmet Size Chart
Model |
XS-Small |
S/M |
L/XL |
Altec |
50 – 55cm |
55 – 59cm |
59 – 63cm |
19⅝ “- 21⅝ “ |
21⅝” – 23¼” |
23¼” – 24¾” |
100Percent Youth Downhill & BMX
Model |
Y-Small |
Y-Medium |
Y-Large |
Status |
47 – 48cm |
49 – 50cm |
51 – 52cm |
18½” – 18⅞” |
19¼” – 19⅝” |
20⅛” – 20½” |