SMK Helmet Size Guide

Not sure what size SMK motorcycle helmet you need? Measure your head circumference just above your eyebrows and ears, then compare your measurement with the SMK helmet size chart below. A properly fitted helmet should feel snug and secure without causing painful pressure points or moving around independently of your head.

SMK Motorcycle Helmet Size Chart

The following SMK helmet sizing chart covers youth and adult sizes from Y-S through to 4XL. The measurements are taken from SMK's published sizing information and are shown in centimetres.

Important: SMK publishes individual head measurements for each size rather than full measurement ranges. Use the figures as a starting point and always try the helmet on to confirm the fit.

Source: SMK Helmets official size chart. These measurements are a guide only. Not every SMK helmet model is necessarily available in every size.

How to Measure Your Head for an SMK Helmet

You'll need a flexible tape measure, preferably the type used for sewing. If you haven't got one, a piece of string and a ruler will do the job.

1. Position the tape: Wrap it around your head, passing just above your eyebrows and ears and around the widest part of the back of your head.
2. Keep it level: Make sure the tape sits flat against your head without pulling it excessively tight.
3. Measure your head: Record the circumference in centimetres.
4. Check again: Repeat the measurement two or three times to confirm accuracy.
5. Find your starting size: Compare your measurement with the SMK helmet size chart above.
6. Try the helmet on: Fasten the chin strap and check that the helmet fits securely without painful pressure points.

If possible, ask someone to help you measure. It's surprisingly easy to position the tape incorrectly when you're doing it yourself.

How Should an SMK Motorcycle Helmet Fit?

A correctly fitted SMK motorcycle helmet should feel snug and secure, with the internal lining making even contact around your head.

SMK recommends checking that the padding sits properly against your head and cheeks, without noticeable gaps.

• Forehead and temples: The lining should make firm, even contact without causing pain.
• Cheeks: The cheek pads should sit directly against your cheeks and feel snug.
• Crown: There shouldn't be noticeable gaps between your head and the helmet lining.
• Movement: With the chin strap fastened, gently move your head up, down and from side to side. The helmet should move with your head rather than slipping independently.
• Comfort: Wear the helmet indoors for a while to check whether uncomfortable pressure points develop.

A helmet that feels loose when new may become even looser as the comfort padding settles with use.

What If Your Head Measurement Falls Between SMK Sizes?

Because SMK publishes individual measurements rather than complete size ranges, your exact head circumference might fall between two figures in the chart.

For example, if your head measures 58 cm, it falls between the listed Medium measurement of 57 cm and Large measurement of 59 cm.

In this situation, use the chart to identify the likely sizes and try both where possible. The correct choice is the helmet that fits securely without excessive movement or painful pressure points.

Don't automatically choose a larger helmet because it feels more comfortable when first tried on. Equally, don't force yourself into a helmet that's painfully tight.

How Do You Know If an SMK Helmet Is Too Big?

A helmet may be too large if it moves independently of your head, feels loose around the cheeks or slides on with very little resistance.

With the chin strap correctly fastened, gently move your head from side to side and up and down. The helmet should stay securely positioned rather than slipping around.

If the helmet already feels loose when new, remember that the comfort padding may settle further with regular use.

How Do You Know If an SMK Helmet Is Too Small?

A helmet that's too small may cause painful pressure around your forehead, temples or the sides of your head.

Some initial firmness is normal, particularly around the cheek pads, but persistent discomfort isn't something you should simply put up with.

The comfort padding may settle slightly with use, but the protective EPS liner isn't designed to compress to accommodate an incorrectly sized helmet.

For more advice, read our guide to dealing with a tight motorcycle helmet.

Can You Wear Glasses With an SMK Helmet?

Many riders wear spectacles with their SMK helmets, although comfort depends on the particular model, your glasses and your head shape.

Try the helmet with your usual glasses whenever possible. Check that the arms don't create uncomfortable pressure around your temples.

Our guide to wearing glasses with a motorcycle helmet

Try SMK Motorcycle Helmets at RaceLeathers

A helmet size chart is a useful starting point, but there's no substitute for trying a helmet on properly.

At RaceLeathers in Darwen, Lancashire, we can help you check the fit of your motorcycle helmet and find a suitable size and shape.

Visit us at 136 Bolton Road, Darwen, Lancashire, BB3 1BZ. We're open Monday to Saturday, 10am to 5pm.

Get directions to RaceLeathers on Google Maps.

Browse our SMK motorcycle helmets and accessories or explore our complete range of motorcycle helmets online.

SMK Helmet Sizing FAQs

Are SMK motorcycle helmets true to size?

SMK provides a published head measurement for each helmet size. However, the final fit depends on your head shape and the particular helmet model. Always use the chart as a starting point and try the helmet on where possible.

What size SMK helmet do I need for a 57 cm head?

According to SMK's published chart, a 57 cm head circumference corresponds to Medium. You should still check the helmet's fit before buying.

What size SMK helmet do I need for a 58 cm head?

A 58 cm measurement falls between SMK's listed Medium measurement of 57 cm and Large measurement of 59 cm. Try both sizes where possible and choose the one that fits correctly.

What size SMK helmet do I need for a 60 cm head?

A 60 cm measurement falls between the listed Large measurement of 59 cm and XL measurement of 61 cm. Check the fit of both sizes rather than choosing solely by the number.

Should a new SMK helmet feel tight?

A new SMK helmet should feel snug and secure, particularly around the cheeks, but it shouldn't cause pain or uncomfortable pressure points.

Do SMK helmets loosen over time?

The comfort padding can compress slightly with use, but the protective EPS liner shouldn't be expected to change shape to accommodate your head.

Does SMK make youth motorcycle helmets?

Yes. SMK's size chart includes youth sizes Y-S, Y-M and Y-L, with published measurements of 48 cm, 50 cm and 52 cm respectively. Check which youth sizes are available for your chosen helmet.

Where can I try SMK helmets in Lancashire?

Visit RaceLeathers at 136 Bolton Road, Darwen, Lancashire, BB3 1BZ, for motorcycle helmet fitting advice. We're open Monday to Saturday, 10am to 5pm. Get directions on Google Maps.