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Item # GIR0271

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Item # GIR0271


The Giro Athlon was created in response to their efforts to better the hugely popular E2 Helmet. In Giro's world this is true -- make it better or don't waste the effort. Well, they didn't waste their time. The Athlon betters its predecessor by moving air more efficiently over the rider's head, and its shape has been improved by Giro's attention to "form language."

You shouldn't be surprised. Giro would never release a new helmet that didn't outperform the one that came before it. Even though the vents in the Athlon appear smaller than what you remember on the E2, Giro has improved their internal channeling to move that air over your head faster and easier. There are a total of 23 wind-tunnel-tuned vents for both intake and exhaust.

The Athlon's shape is more in tune with a human head than the E2. This is actually something we'd struggled with when checking out the E2. We liked the vents, the Roc Loc, etc, but the helmet didn't work with our aesthetic sense. It turns out that Giro felt this way too. So the shape is more organic but still has an aggressive quality about it. The Athlon also sits a bit lower on the head which helps it seem to disappear when riding.

The Athlon uses Giro's latest retention system, Roc Loc 5. The advantage over the older Roc Loc 4 is that you can make micro adjustments to the retention basket with a thumb and finger -- simply twist the ratcheting dial to achieve perfection. The whole system can be adjusted up and down to cradle the back of your head just as you like. Some of Giro's forward thinking gave rise to the special shape of the arms -- they allow the use of Giro's eyewear without interference, and they maintain the position of your straps so getting the helmet on is a no-muss, no-fuss affair.

The Giro Athlon Helmet is available in Black/charcoal and Matte White and in three sizes -- small, medium, and large. The visor has 15° of vertical adjustability for optimal protection/visibility, and it's removable as well. The wicking pads are durable, thanks to the welding of the cover material to the pad material, and easy to wash if they get stinky.

  • 23 vents with Wind Tunnel air channel technology keep your dome from overheating
  • All-new RocLoc 5 allows for quick and easy on-head adjustment
  • Internal Roll Cage provides extra strength upon impact

Tech Specs

[shell] plastic, foam
Fit Adjustment:
slidelock chin
Recommended Use:
XC racing, mountain biking
Manufacturer Warranty:
1 year

Size chart


Adult Cycling Helmets
 SS/MMM/LLXLAdult UniversalWomen's Universal
Head Circumference 20 - 21.75in
(51 - 55cm)
20 - 22.5in
(51 - 57cm)
21.75 - 23.25in
(55 - 59cm)
21.75 - 24in
(55 - 61cm)
23.25 - 24.75in
(59 - 63cm)
24 - 25.55in
(61 - 65cm)
21.25 - 24in
(54 - 61cm)
19.75 - 22.5in
(50 - 57cm)
Head Circumference 20 - 20.75in
(51 - 53cm)
21.25 - 22in
(54 - 56cm)
22.5 - 23.25in
(57 - 59cm)
23.5 - 24.25in
(60 - 62cm)
How to Measure:
For best results, use a tape measure to measure around your head where your hat would fit comfortably.

Reviews & Community


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Everything I expected

  • Familiarity: I've used it several times

This is a solid product that does everything that the manufacturer claims. Plus, buying it through provided me with a great discount!

Great Helmet with Roc Loc 5

  • Familiarity: I've put it through the wringer

I have a few Giro MTB helmet and this is the first one with Roc Loc 5 and the are so easy to turn and adjust. I like the Matt Black color and the simple design. It looks nice with and without the visor. The 300g weight is ok for Mountain Biking and you hardly feel the weight. The strap is thin and soft unlike some low end Giro helmet. Since I was my helmet after long ride, cleaning the padding is a little inconvenience. It has 5 pieces and I lost 2 small one. I would recommend them when on sale since it is pricey for full price.

Avg. ride time: 58m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Great value, fits the ladies too

    My wife loves this helmet. If only it came in a few more colors that were women-specific, it would be perfect, but the fit is nearly as good as much more expensive offerings from Giro and she likes that the visor is there for dirt rides and removable when she's on the road.

    Great value, fits the ladies too

    Very pleased with this purchase

      Nice looking helmet in the matte finish. Sizing chart is correct. Helment comes packaged with 2 plugs to fill holes if peak is removed and larger pads for smaller head cirumferences. No replacement pads included as with the 2 previous Giro helments I've purchased but this isn't a deal breaker. Great price from Real Cyclist.

      Very pleased with this purchase

      Where did you find the silver finish (i.e., not the green)?

      From Real Cyclist...I think I may have ordered the last one.

      Does the lid detach?

      Does the lid detach?

      It appears to. There are 2 plugs included in the packaging that look like they would fill the slotted holes had I removed the peak.

      Great Helmet

        This Helmet is great. I have been using it for a few months now and am very happy with it. It is light and fits great. I had an older Athlon with the RocLoc 4 system and was happy enough with it but the RocLoc 5 system on the new Athlon is definitely more sturdy and better designed. The venting is good and I like the fact that the visor is removable for when I jump on my road bike. All in all it is a great helmet for the price.