Mountain biking has a habit of testing your equipment. Rocks, roots, steep descents and the occasional questionable line choice are all part of the fun. Bell knows this rather well, which is why the 4Forty MIPS Solid Mountain Bike Helmet has been designed to handle proper trail riding.
The 4Forty brings together some of Bell's best helmet technology in a comfortable, confidence-inspiring package. MIPS Evolve helps manage rotational forces during certain impacts, while the lightweight Float Fit system makes getting the fit right refreshingly straightforward. Extended rear coverage provides additional protection around the back of your head, and clever features like Sweat Guide technology, an adjustable visor and integrated goggle grip show that Bell has actually thought about what happens once you start riding. It's a genuinely capable all-mountain helmet with the features you'd expect from something considerably more expensive. Which leaves more money for bike parts. Because apparently there's always another upgrade.
Key Features
MIPS Evolve Safety System – Integrated rotational impact management technology designed to help reduce rotational forces transferred to the head during certain impacts
Float Fit Adjustment System – Lightweight retention system with an easy-to-turn rubberised dial for quick, comfortable adjustments
Integrated MIPS & Fit System – Combines the MIPS slip-plane technology with the helmet's retention system to reduce complexity and weight
Extended Rear Coverage – Additional shell coverage around the back of the head provides practical protection for demanding mountain bike riding
Full Hard Shell Construction – Durable outer shell designed to cope with the demands of regular trail use
Generous Ventilation – Carefully positioned vents help keep air moving when the climbs start to feel considerably longer than expected
Adjustable Visor – Move the visor to suit changing conditions, improve sun protection or make room for goggles
Sweat Guide Technology – Clever padding design helps direct moisture away from your brow and eyewear. Because nobody enjoys riding with sweat dripping into their sunglasses.
Integrated Goggle Gripper – Rubber grip at the rear of the helmet helps keep your goggle strap securely positioned
No-Twist Tri-Glides – Quick-adjust strap guides help keep helmet straps flat, tidy and correctly positioned
Comfortable All-Mountain Fit – Designed to provide dependable comfort and security during longer trail rides
Lightweight Construction – Efficient shell and retention system design balance protection with everyday comfort
Trail-Focused Design – Purpose-built for mountain biking with practical features that make a genuine difference on the bike
Goggle-Friendly Compatibility – Adjustable visor and rear strap grip accommodate goggles for more demanding riding
Premium Features At An Accessible Price – Brings technology and practical details typically associated with higher-end helmets into a more affordable package
Versatile All-Conditions Performance – Well-equipped for technical trails, trail centres and challenging mountain bike adventures
The Bell 4Forty MIPS is the sort of helmet that quietly gets everything right. It's comfortable, protective, well ventilated and packed with features that make sense once you're out on the trails. Bell hasn't wasted time adding unnecessary gimmicks or flashy extras; they've focused on building a genuinely capable mountain bike helmet that punches well above its price. Your riding might still involve the occasional questionable decision, but at least your choice of helmet doesn't have to be one of them.