Troy Lee Designs Bike Helmet Size Chart

1. Achieve the perfect fit by measuring your head circumference correctly.

2. Watch the video below to see how to measure your head correctly. (If you don’t see a video below, please refresh this page, or you might need to allow this website through your Ad blocker.)

3. VIDEO: How To Measure For A Bike Helmet

4. On the chart below, find the helmet model that you are interested in, then find your head measurement to see which size you need.

Troy Lee Designs Bike Helmet Size Charts

Model – Full Face XS S M L XL XXL
D4 Carbon MIPS Helmet 53 – 54cm 55 – 56cm 57 – 58cm 58 -59cm 60 – 61cm 62 – 63cm
20⅞” – 21¼” 21⅝” – 22″ 22⅜” – 22¾” 22¾” – 23¼” 23⅝” – 24″ 24⅜” – 24¾”
D4 Composite MIPS Helmet 53 – 54cm 55 – 56cm 57 – 58cm 58 -59cm 60 – 61cm 62 – 63cm
20⅞” – 21¼” 21⅝” – 22″ 22⅜” – 22¾” 22¾” – 23¼” 23⅝” – 24″ 24⅜” – 24¾”
D3 Fiberlite Helmet 52 – 53cm 54 – 55cm 56 – 57cm 58 – 59cm 60 – 62cm 63 – 65cm
20½” – 20⅞” 21¼” – 21⅝” 22″ – 22⅜” 22¾” – 23¼” 23⅝” – 24⅜” 24¾ – 25⅝”
Model – Half Shell XS S M/L XL/XXL
A1 Helmet 48 – 54cm 54 – 56cm 57 – 59cm 60 – 62cm
19″ -21¼” 21¼” – 22″ 22⅜” – 23¼” 23⅝” – 24⅜”
A1 MIPS Helmet 48 – 54cm 54 – 55cm 57 – 59cm 60 – 62cm
19″ -21¼” 21¼” – 22″ 22⅜” – 23¼” 23⅝” – 24⅜”
Model – Half Shell S M/L XL/XXL
A2 MIPS Helmet 54 – 56cm 57 – 59cm 60 – 62cm
21¼” – 22″ 22⅜” – 23¼” 23⅝” – 24⅜”
Model – Full Face XS/S M/L XL/XXL
Stage MIPS Helmet 54 – 56cm 57 – 59cm 60 – 63cm
21¼” – 22″ 22⅜” – 23¼” 23⅝” – 24¾”
Model – Half Shell Universal Youth / XS
Youth A1 48 – 54cm
19″ -21¼”
Youth A1 MIPS 48 – 54cm
19″ -21¼”