How to Measure Bike Helmet Size

A good bike helmet is an essential piece of equipment for any bicyclist, regardless of age, skill level, or experience. But how do you know if a helmet is a right size?

In this post, we’ll give you tips on how to measure bike helmet size so that you can find the perfect fit for your next ride!

1. First, find a measuring tape and place it around your head about an inch above your eyebrows. Make sure the tape is leveled all the way around. Note the measurement in inches or centimeters.
2. To get your circumference, use a cloth tape measure or a string that you can mark and then measure with a ruler. Again, place the tape measure or string around your head about an inch above your eyebrows, making sure it’s level all the way around.
3. If you’re using a string, mark where it meets and then measure the length with a ruler. This is your circumference. compare this number to the sizing chart of the helmet you’re interested in purchasing.
4. If you don’t have a string or tape measure handy, no worries! You can also use a piece of paper or ribbon instead. Just wrap it around your head like you would a tape measure or string and make a note of where it overlaps. Then, use a straight edge (ruler) to measure the length of the paper or ribbon to get your circumference. Again, compare this number to the sizing chart for the helmet you want to buy.
5. Once you have your circumference measurement, it’s time to try on helmets! Start by adjusting the straps—the Y-shaped strap that goes under your chin should form a “Y” just below your earlobe when properly adjusted. The side straps should meet just above each ear in what’s called a “bunny ear” configuration when properly adjusted.
6. With the straps in place, gently rock the helmet back and forth and side to side on your head—it should be snug but not too tight, and shouldn’t move more than about an inch in any direction. If it does, adjust the straps again until it’s snug but not too tight. You may need to experiment with different sizes or brands until you find one that fits just right.
7. Now that you’ve found a helmet that seems like it will fit well, put it on and tighten the adjustment mechanisms so that it’s snug but not too tight. Once again, try moving the helmet back and forth and from side to side—it shouldn’t move more than about an inch in any direction.
8. If it does, adjust as necessary until it fits snugly but comfortably.
9. Get someone else to check if everything looks good —the straps should be positioned correctly, as described in step 5, and there shouldn’t be any gaps between the edge of the helmet and your forehead.
10. Last, but not least, make sure you can see out of the visor or sunglasses shield (if applicable) without obstruction—you should have an unobstructed field of vision when looking straight ahead through both eye ports.

Conclusion

We hope these tips on how to measure bike helmet size were helpful! Remember, always err on the side of a slightly tighter fit since helmets will loosen up slightly over time with wear!