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LAS Cronometro helmet



Good lower-cost aero helmet for shaving a few seconds off your personal best

The LAS Cronometro helmet is a (relatively) cheap way to make your head fully aero for your next evening 10 or the club 25. Overall it puts in a good performance and is comfier than you'd expect from an aero lid.

It's a bit heavy, and the venting isn't best in class, but for the money it's a good buy if you're looking to shave some seconds off your time.

Time trialing is very much a discipline where minor gains add up to a better performance. But what to upgrade first? Eighty percent of the overall drag of bike and rider is the rider, so minimising frontal area and making the body as slippery as possible are primary concerns.

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Aero bars should always be your first purchase. Fitting them drops your frontal profile drastically and it's commonly held this can be worth up to a minute over a ten-mile time trial. But an aero lid is high on the list too. Wearing one smooths the airflow over your head and back, reducing drag. It might be worth a quarter of a minute over ten miles. That could be a few places, and it's an easy win.

The LAS Cronometro is a fairly classic design. While people like Kask (with the Bambino) and Lazer (the Wasp Air) are busy chopping tails off the LAS still has a full teardrop profile. Current wisdom would dictate that it should be better facing straight into the wind, with the shorter helmets performing better over a wider range of wind angles (and also head angles when you get tired and start bobbing around). There's still plenty of both types of lid out there, so probably you can take your pick; either will be more effective than a road lid, especially a non-aero one.

It's a one-piece outer and there are two small vents in the front which channel air through the EPS inner shell. There's a full front visor, which is repositionable with a bit of pulling and swearing, and you get tinted and yellow lenses. You get the normal goldfish-bowl feeling of being in a fully-enclosed lid but the vents do their job and the side visibility is pretty decent. The harness is basic, the pads simple and comfy. Once it's on it's a pretty easy wear, and there's room '' just '' behind the lens for a pair of glasses. However, I tended to wear contact lenses with the Cronometro because it was easier to get it on and off.

And did it work? Well, I managed a personal best on one local course, so I guess that's good. I was wearing aero shoe covers for the first time and they probably helped a bit too. And it was a nice calm day: it's impossible to single out the empirical effect of the helmet. But I did go faster, and I did look pro, even though I don't have a skin suit.

Overall it's a good lid. Given that you can easily pay twice as much as this for an aero helmet it seems like a good choice if you're starting out on the road to faster TT times. It's fairly basic in terms of build but it's a slippery shape, and it's comfy and not unbearably hot. It's probably a good idea to get your aero bars and skin suit first, but then this should be an option. The disc wheel can wait.


Good lower-cost aero helmet for shaving a few seconds off your personal best

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Make and model: LAS Cronometro helmet

Size tested: One size

Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

Designed to shave seconds off your time, the Cronometro's sleek lines, visor and neck extension help minimize drag and air resistance to give you an aerodynamic advantage that is perfect for Time trialling.

The position of the vents allow the airflow to continuously cool without compromising the aerodynamics.

Tell us some more about the technical aspects of the product?

TT design

Velcro system with neck guard

Coolmax removable washable interior

Supplied with clear and yellow detachable visors

2 vents/Internal channelling

Helmet bag

Weight: 400g

Rate the product for quality of construction:

It's fairly basic but well put together.

Rate the product for performance:

Surprisingly comfortable, not too hot, visor a bit sticky.

Rate the product for durability:

Should last ok, no issues so far.

Rate the product for weight, if applicable:

Heavier than stated but light weight is not the primary concern here.

Rate the product for comfort, if applicable:

Pretty comfy for an aero lid.

Rate the product for value:

Cheap compared to some of the competition.

Tell us how the product performed overall when used for its designed purpose

It does a job without breaking the bank.

Tell us what you particularly liked about the product

Comfier than I expected.

Tell us what you particularly disliked about the product

Could do with a bit more venting.

Did you enjoy using the product? Yes.

Would you consider buying the product? Yes.

Would you recommend the product to a friend? Yes.

Use this box to explain your score

It's a good value aero lid, the construction is nothing special but it does the job fine.

Overall rating: 7/10

About the tester

Age: 43  Height: 189cm  Weight: 92kg

I usually ride: whatever I'm testing...  My best bike is: Kinesis Tripster ATR, Kinesis Aithein

I've been riding for: Over 20 years  I ride: Every day  I would class myself as: Experienced

I regularly do the following types of riding: road racing, time trialling, cyclo cross, commuting, club rides, sportives, general fitness riding, fixed/singlespeed, mtb, Mountain Bike Bog Snorkelling, track


Dave is a founding father of, having previously worked on Cycling Plus and What Mountain Bike magazines back in the day. He also writes about e-bikes for our sister publication ebiketips. He's won three mountain bike bog snorkelling World Championships, and races at the back of the third cats.

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