Sizing Charts Helmets

MaximumBMX has put together the following suggestions to help you with sizing questions. Keep in mind that these are only guidelines. If you have an questions you can reach us at 317-462-6008.

Helmet Sizing Charts

To determine your hat size, measure your head about 1/2" above your brow in cm and refer to the chart.

Hat Size 6": 6 - 1/4" 6 - 3/8" 6 - 1/2" 6 - 5/8" 6 - 11/16" 6 - 3/4" 6 - 3/4"
Head Circumference
Metric cm:
50 51 52 53 53.5 54 55
Hat Size 7": 7" 7 - 1/8" 7 - 1/4" 7 - 3/8" 7 - 1/2" 7 - 5/8" 7 - 3/4" 7 - 7/8"
Head Circumference
Metric cm:
56 57 58 59 60 61 62 63
Hat Size 8": 8" 8 - 1/8" 8 - 1/4" 8 - 3/8"
Head Circumference
Metric cm:
64 65 66 67

GMAX Helmets Sizing Chart

4XS/YS 3XS/YM 2XS/YL XS S M L XL 2XL 3XL
FLY: 6 6-1/8 - 6-1/4 6-3/8 - 6-1/2 6-5/8 - 6-3/4 6-7/8 - 7 7-1/8 - 7-1/4 7-3/8 - 7-1/2 7-5/8 - 7-3/4 7-7/8 - 8 8/1/2
GMAX: 6 6-1/4 - 6-3/8 6-1/2 - 6-5/8 6-3/4 - 6-7/8 7 - 7-1/8 7-1/4 - 7-3/8 7-1/2 - 7-5/8 7-3/4 - 7-7/8 8 - 8-1/8 8/1/2
THH: 6-1/8 - 6-1/4 6-3/8 - 6-1/2 6-5/8 - 6-3/4 6-7/8 - 7 7-1/8 - 7-1/4 7-3/8 - 7-1/2 7-5/8 - 7-3/4 7-7/8 - 8