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    Road6Mountain5All Day4Kids2All bike helmets →2027 collection · Preview
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Size Guide

Cycling helmet size chart
SizeHead circumference (cm)Head circumference (in)
S — Small53–5620⅞–22
M — Medium56–5922–23¼
L — Large59–6223¼–24½
XL — X-Large62–6424½–25¼
Toddler48–5218⅞–20½
Child52–5720–22½*

Cycling helmet size & fit guide

Measure your head

Use a soft measuring tape around your head, approximately 1 cm above your eyebrows and ears. Record the circumference and compare it with the table. If you do not have a tape, use string and then measure it with a ruler.

Compare your measurement with the chart above. It is the general cycling chart from the LEM 2027 Bike Collection; check the size options for your chosen model, as not every model lists every size.

*The Child inch range is printed as shown in the catalogue. Use the centimetre range for this row while the inch conversion is checked; 52 cm is approximately 20½ inches. For help with a measurement at a shared size boundary, contact [email protected].

Adjust the fit

  1. Position the helmet level on your head, with the front edge just above your eyebrows.
  2. Adjust the side straps to form a V directly below each ear.
  3. Fasten the chin strap comfortably, leaving room for one or two fingers between the strap and your chin.

Motorcycle helmets

This chart is for cycling helmets. For motorcycle sizing advice, contact [email protected] before choosing a size.