Motorcycle Helmet Fitting Guide: How to Get Perfect Fit

A helmet that doesn't fit properly won't protect properly. This isn't marketing exaggeration. An ill-fitting helmet can rotate in a crash, exposing your face and reducing impact distribution. Getting fit right is as important as getting safety ratings right.

Head Shape Basics: Heads aren't round. They're categorised as round oval, intermediate oval, or long oval. Your head shape determines which brands fit you naturally.

Round oval: Equal length front-to-back and side-to-side. Brands like Arai tend to fit rounder heads. Intermediate oval: Slightly longer front-to-back. Shoei, AGV, and most brands target this common shape. Long oval: Noticeably longer front-to-back. Some HJC and Scorpion models suit longer heads.

Measure your head circumference with a soft tape measure across your forehead, just above your eyebrows. This gives a starting size, but head shape matters more.

The Fit Test: When you put a helmet on, it should feel evenly snug all around. No pressure points, no loose spots, no air gaps. The padding contacts your entire head.

Cheek pads should press firmly against your cheeks. This feels restrictive at first but becomes comfortable after break-in. Loose cheek pads indicate wrong size or shape.

Try to rotate the helmet on your head. It shouldn't move independently from your head. If you can turn the helmet while your head stays still, it's too loose.

The Roll-Off Test: With the chin strap fastened properly, grab the back of the helmet and try to roll it forward off your head. A properly fitted helmet resists this motion. Your eyebrows will lift before the helmet moves significantly.

If the helmet rolls forward easily, it's too loose and could come off in a crash. Size down or try different brands.

Break-In Expectations: New helmets feel tighter than they will after break-in. The interior foam compresses 15-20% over the first 20-30 hours of wear. A new helmet should feel slightly uncomfortable (without pain) to account for this.

If a helmet feels perfect in the shop, it will be too loose after a month. Size down or try different cheek pads.

Pressure Points: Pain or numbness indicates poor fit. Pressure points don't break in, they get worse. Headaches after riding suggest compression in the wrong places.

Try different brands before assuming you need a larger size. Your head shape may simply not match that helmet's interior shape.

Glasses Compatibility: If you wear glasses, bring them to helmet shopping. The temple arms need to fit between your head and the cheek pads without pressure. Some helmets have channels for glasses; others don't accommodate frames well.

Modular helmets make glasses easier since you can flip the chin bar up to put them on.

When to Replace: Replace your helmet every 5 years regardless of visible condition. Foam degrades and loses protective properties. UV exposure from riding accelerates this.

Replace immediately after any impact, even if no visible damage. The foam is designed to crush once, absorbing the impact. It may look fine but won't protect in a second impact.

Fit changes over time as padding compresses. If your helmet feels noticeably looser than when new, it may be time for replacement.

Our Recommendation: Buy your first helmet in a shop where you can try multiple sizes and brands. Online shopping works once you know your exact size in a specific model. Don't guess at fit for safety equipment.

Allow 30+ minutes for helmet shopping. Try on at least 4-5 options. Walk around the shop wearing your top choice for 10 minutes to check for developing pressure points.

Not sure which style suits your needs? Our quiz considers your riding type and helps narrow the options before you shop.