iOutdoor 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.

3. VIDEO: How To Measure For A Bike Helmet

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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.

iOutdoor Bike Helmet Size Charts

iOutdoor Bike Helmets Standard Sizing

Model S M L
Multi-Sports Safety Helmet 48 – 54cm 55 – 57cm 58 – 61cm
18.9″ – 21.2″ 21.3″ – 22.4″ 22.5″ – 24″
Kids Bike Helmet 48 – 54cm 55 – 57cm 58 – 61cm
18.9″ – 21.2″ 21.3″ – 22.4″ 22.5″ – 24″

iOutdoor Bike Helmets Universal Sizing

Model Universal Size
Lightweight Adult Bike Helmet 56 – 64cm
22″ – 25¼”