A helmet that suits you can enhance the experience of every ride, and most importantly, it can ensure that it works when you need it. This guide explains in detail how to choose the right bicycle helmet size and adjust it to achieve the best fit.
How to find the right bike helmet size at home
Use a tape measure or a rope and a ruler to measure your head circumference. Please make sure to measure horizontally above your ears with your eyebrows. Use the bicycle helmet size chart to find the right helmet size based on your measurements.
Wear the helmet in the correct position and protect your forehead

How to check bike helmet size
Some bicycle helmet models have different sizes, which are more suitable for different sizes of heads. To check if the size is appropriate, please wear a helmet and adjust the rear fit system. The right size should feel comfortable, but not too tight.

How to fix the excess chin strap
Due to the size of the head, there may be an extra chin strap after adjustment. You can fold it up and tuck it into the strap holder, or you can cut it off. If you choose to shorten the chin strap, cut it at least 1 inch (25 mm) beyond the buckle.
After cutting off the chin strap, use a heat source to melt the burrs of the strap to prevent abrasion. Be careful when the fire source is near the helmet. The material of the strap is flammable. Do not touch the melted nylon tape until it becomes cold, as this will cause burns.