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Troy Lee MTB Helmet Sizing

A1/A2 MTB Helmets

Size Head (in)
XS 19 - 21 1/4
SM 21 1/4-22
MD/LG 22 3/8 - 23 1/4
XL/2XL 23 5/8 - 24 3/8

A3 MTB Helmet

Size Head (in)
XS/SM 20 7/8 - 22
MD/LG 22 3/8 - 23 1/4
XL/2XL 23 5/8 - 24 3/4

D3 MTB Helmet

Size Head (in)
XS 20 1/2 - 20 7/8
SM 21 1/4 - 21 5/8
MD 22 - 22 3/8
LG 22 3/4 - 23 1/4
XL 23 5/8 - 24 3/8
2XL 24 3/4 - 25 5/8

Stage MTB Helmet

Size Head (in)
XS/SM 21 1/4 - 22
MD/LG 22 3/8 - 23 1/4
XL/2XL 23 5/8 - 24 3/4

Sizing information is provided by the manufacturer and does not guarantee a perfect fit.

How to Measure

  • H Head
    Wrap a cloth measuring tape around your head just above your eyebrows and ears. Pull the tape comfortably snug, read the length, repeat for good measure and use the largest measurement.
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By purchasing and enrolling in Riders Preferred Membership, you agree to the Program Terms and Conditions. *Some exclusions apply: 10% RPM discount applies on full price and sale price Exclusive Brands. 10% RPM discount applies on additional select brands at full price. Exclusions apply. RPM free 2-day shipping applies on qualifying items, contiguous U.S. only. Not available for AK, HI, or U.S. Territories. View shipping policies. RPM free returns apply on qualifying items and are processed on standard return timeline, contiguous U.S. only. View return policy.