Bell Z20 Aero MIPS helmet review

The Bell Z20 Aero MIPS is the wind cheating road helmet from the US brand which also manufactures protective gear for motorcyclists, mountain bikers and BMXers.

>>> Best cycling helmets 

Bell make the Z20 in a few guises - the standard Z20, Z20 Ghost and the Aero model. As you'd expect, this one is meant to cut through the air with minimal drag.

Unfortunately, we didn't get to confirm its watt saving performance at our recent testing session at Newport Velodrome, but it's interesting to note that the difference between the "best" and "worst" helmets at 30kph was in the region of 2 watts, extending to around 9 watts at 45kph. Comfort and fit are therefore likely to play a leading role in most riders' decision making process.

When it comes to breathability, Bell has added 10 vents - a lot less than the standard Z20 with 18. However, in testing I found that airflow was plentiful and I didn't overheat, though I've yet to try this lid in high temperatures abroad.

Two of the vents at the top of the helmet can be uses as a glasses port. This system did work, but the vents are quite close together, meaning I had to push the glasses quite far in to ensure they were locked in place, and they didn't feel as secure as I would like.

Bell has used two-layers of hard shell EPS foam as well as embedding a MIPS system, and the latter has been applied using the brand's own 'Float Fit Race' retention system. This means that the rear dial adjusts the height and width of the fit simultaneously, and sets the lid apart from the competition where the MIPS layer is an additional insert.

The dial is easy to use and a size small fitted my head with no problems, or unwanted pressure.

Inside, there's X-Static and XRT-2 padding, designed to wick away sweat and keep whiffs at bay. The padding continues at the forehead, where the 'sweat guide pad' aims to pull moisture away from the brow pads, providing a welcome service for those who find their forehead leaks a lot on long, hot climbs.

The helmet straps were easy to adjust. However, they're made from quite a coarse fabric, which felt like a bit of a let down for a model retailing at over £200.

Bell's claimed weight is 296g for a size medium, and my size small came in at just 252g, which puts it on a reasonable footing when compared with other optimised models - the Abus Gamechanger I put through its paces earlier in the year came in at 256g in the same size whilst a Smith Ignite in a Medium was 277g.