Mountain biking is a demanding sport—compromises and shortcuts when it comes to gear are never a good idea.

The 4Forty is built to withstand the rigors of a trail riding life; with generous ventilation, the comfort of Float Fit and built-in Sweat Guide, extended rear coverage, a full hard-shell, adjustable visor, and the option of integrated MIPS protection.

Boasting the comfort, protection and broadly capable features of helmets costing twice as much, the 4Forty is a bantamweight, all-conditions, all kinds of trail champion packing a heavyweight value.

- GoggleGuide™ Adjustable Visor
- No-Twist Tri-Glides™
- Sweat Guide™
- MIPS® (integrated with fit system)

- Fusion In-Mold Polycarbonate Shell

- Float Fit™(integrated with MIPS)

- 324 grams (363 w/ MIPS) (size M)

- S 52–56 cm
- M 55–59 cm
- L 58–62 cm
- XL 61-65 cm (select colours)


- CPSC Bicycle*, CE EN1078


- 15

Bell 4Forty MIPS MTB Helmet

Mountain biking is a demanding sport—compromises and shortcuts when it comes to gear are never a good idea.

The 4Forty is built to withstand the rigors of a trail riding... Read more

£89.99 £54.95

Select Colour
  • Matte/Gloss Blue/Black Matte/Gloss Blue/Black
  • Matte/Gloss Grey/Red Matte/Gloss Grey/Red
  • Matte/Gloss Blue/Hi-Viz Matte/Gloss Blue/Hi-Viz
  • Black Camo Black Camo
  • Matte/Gloss Slate/Orange Matte/Gloss Slate/Orange
  • Cliffhanger Matte/Gloss Grey/Crimson Cliffhanger Matte/Gloss Grey/Crimson
  • Matt/Gloss Black Matt/Gloss Black
Size Please select
  • M 55-59cm
  • L 58-62cm
  • S 52-56cm
  • XL 61-65cm



Delivery Information

We have a range of delivery options on orders. Most importantly, if your order is over £40 then delivery is free!

All Biketart orders are fully trackable. You will get a tracking number by email when your order is shipped.

Delivery Services

Standard Tracked: All orders over £40 are eligible for free standard tracked delivery. For orders under £40 there is a £2.99 charge. Orders sent using standard tracked are usually delivered in 2-3 days.

Premium Tracked: For £3.99 your order is sent by premium tracked delivery which gives a 1-2 day (including Saturdays) delivery timescale. This service is provided by Royal Mail who will usually deliver on Saturdays. Orders must be placed by 4pm

Next Day Courier: If you require next-working-day delivery then this is provided by DPD and is £6.99. Orders must be placed by 3.30pm in order to be processed before our daily DPD collection.

Saturday Delivery: You can select Saturday delivery options from DPD at the checkout.

Bike Delivery: Bikes are always delivered by courier. After placing a bike order your bike is fully assembled and tested before being carefully boxed for shipping. Because of this build process it is not always possible to offer next-day delivery on a bike. Please do get in touch if you want to know a specific despatch day on any bike on our website. Call us on 01227 832582 or email

Returns Info

We offer a 30 day return period on our items. We ask that items are returned in their original packaging and in re-sellable condition. We do not pay returns postage.unless we have made an error with your order.


We cannot accept the return if the item is not correctly packaged and is damaged in transit during the return trip back to us.


    Please do not stick any tape or labels to the products branded outer packaging.


      If you require an exchange it is recommended that you re-order the correct size/item and return the item you do not wish to keep to us for a refund.