Prowell 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.

Prowell Bike Helmet Size Chart

Model X-Small Small Medium Large
C42-Ithaca 50 – 54cm


19¾” – 21¼”


K800-Spark
52 – 58cm


20½” – 22⅞”

P100-Jemini

55 – 61cm


21¾” – 24″
R6800-Airglider

55 – 61cm 59 – 65cm


21¾” – 24″ 23¼” – 25⅝”
W1000-Sakai

54 – 60cm


21¼” – 23⅝”
X9-Bertil

56 – 62cm


22″ – 24½”