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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.