Bell 5Fifty Spherical Grid Helmet

The Bell 5Fifty Spherical is Bell's flagship open-face mountain bike helmet, built for aggressive trail and enduro riding. It has Bell's Spherical rotational protection developed with Mips, a motorsport-inspired ventilation system, a magnetic FIDLOCK buckle and a mount for an action camera or light.

It replaces the Super Air Spherical at the top of Bell's half-shell range.

Spherical technology, powered by Mips

Most crashes hit the head at an angle, which makes it rotate as well as stop. Bell's Spherical system is designed to reduce that rotation. The liner is made in two parts, an inner and an outer, that work like a ball and socket. In an angled impact, the outer part can rotate around the inner part, which is designed to reduce the rotational motion passed to your head.

Because the rotation happens between the two foam layers rather than through a thin plastic liner, there's nothing extra sitting against your head. The liner combines EPS and EPP foam inside a Fusion in-moulded polycarbonate shell.

Dual Flow ventilation

Enduro riding means long, slow climbs followed by hard descents, so a helmet has to keep you cool at low speed. Bell's Dual Flow Ventilation uses large intake vents and internal channels to push air over your head, and a diffuser at the back, borrowed from motorsport, helps pull warm air out. A Sweat Guide at the brow channels sweat away from your forehead and eyewear.

Fit and comfort

• Float Race Fit System: a 360-degree fit system with a dial to adjust tension, plus height adjustment, so the helmet sits level and stable on rough ground.
• FIDLOCK magnetic buckle: opens and closes one-handed, even with gloves on.
• No-Twist Tri-Glides: keep the straps flat and in place around your ears.
• Ionic+ padding: antimicrobial padding that controls odour and dries quickly.

Visor, eyewear and camera mount

The visor has three positions: drop it to block the sun, or push it up to fit goggles underneath. There's storage for your eyewear when you take it off on the climb. A quick-release mount takes an action camera or a helmet light.

Sizing

How to measure:

Wrap a soft tape measure around your head about 2.5cm (one finger-width) above your eyebrows, at the widest point.

If you measure in the overlap between two sizes, try both: the right one sits level and feels snug before you tighten the dial.

Every helmet we sell is fitted and sized at the time of purchase. Compare it with the rest of our MTB helmets.

Frequently asked questions

Does the Bell 5Fifty have Mips?

Yes. It uses Bell's Spherical technology, developed with Mips, where the inner and outer liners rotate against each other in an angled impact.

Does the Bell 5Fifty replace the Super Air?

Yes. The 5Fifty Spherical replaces the Super Air Spherical as Bell's flagship open-face mountain bike helmet.

How much does the Bell 5Fifty Spherical weigh?

Bell quotes around 500g in size Large.

What size Bell 5Fifty do I need?

Small fits 52 to 56cm, Medium 55 to 59cm and Large 58 to 62cm, measured around your head about 2.5cm above your eyebrows.

Is the Bell 5Fifty compatible with goggles?

Yes. Push the visor up to its highest position to fit goggles underneath.

Can I mount a camera or light on the Bell 5Fifty?

Yes. It has a quick-release mount for an action camera or helmet light.

Which safety standards does the Bell 5Fifty meet?

It's certified to the European EN 1078 and US CPSC bicycle helmet standards. Both are accepted for bicycle helmets sold in Australia.

Should I replace the helmet after a crash?

Yes. Replace any helmet after a crash or hard impact, even if it looks undamaged. The foam can be compressed inside without showing on the outside.

Specifications