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

2. Watch the video below to see how to measure your head correctly.

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
D4 Carbon MIPS Helmet	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
D4 Composite MIPS Helmet	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
D3 Fiberlite Helmet	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
A1 Helmet	19″ -21¼”	21¼” – 22″	22⅜” – 23¼”	23⅝” – 24⅜”
A1 MIPS Helmet	48 – 54cm	54 – 55cm	57 – 59cm	60 – 62cm
A1 MIPS Helmet	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
A2 MIPS Helmet	21¼” – 22″	22⅜” – 23¼”	23⅝” – 24⅜”

Model – Full Face	XS/S	M/L	XL/XXL
Stage MIPS Helmet	54 – 56cm	57 – 59cm	60 – 63cm
Stage MIPS Helmet	21¼” – 22″	22⅜” – 23¼”	23⅝” – 24¾”

Contact