How to Choose the Right Motorcycle Helmet Size

CSM

Oct 28

2 min read

A helmet size label is a starting point. The right fit depends on your head measurement and the particular helmet model. Whether you are choosing a first helmet for a young rider or replacing your own, a few checks can make the choice easier.

1. Measure your head

Use a soft tape measure and run it horizontally around your head, above your eyebrows and across the widest part at the back. Keep the tape comfortably against your head and record the circumference in centimetres. Repeat the measurement to check your result.

2. Check the chart for the exact model

Match your measurement to the manufacturer's chart for the helmet you are considering. Adult and youth size labels are different, and the same letter does not guarantee the same fit across models. Use the choices shown on the product page, then ask CSM to check availability.

For O'Neal and KINI helmets, open the manufacturer's official size guide and select the helmet category and matching model.

3. Choosing a youth helmet

Measure the rider's head rather than choosing by age alone. Check the youth chart for that model, and bring the rider into CSM for help checking the fit. If a measurement falls between the listed sizes or the helmet does not feel right, ask our team before ordering.

4. Adjustable-fit farm and ATV helmets

An adjustable-fit helmet uses a different sizing approach from a helmet sold in separate letter sizes. The FFM AgHat MAX has a stated adjustable range of 52–64 cm. Check the model information and its adjustment instructions, and visit CSM to check fit.

See FFM AgHat MAX information from the NZ supplier for the published fit range and product details.

5. Check the fit before you order

A size chart cannot show how a helmet will feel on your particular head. Fit can vary between models, so trying the helmet is useful. Follow the manufacturer's fitting and fastening instructions and ask CSM for help if you are unsure.

Send us the details

When enquiring, include the helmet name, preferred colour and size, and your head measurement in centimetres. Let us know if you need it by a particular date so we can check stock or supplier arrival estimates.

Browse helmets and riding gear at CSM or visit our team at 30 Main Road, Tokoroa, for sizing and fit help.