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Giro Quarter helmet



Good option for leisurely city riding. And dirt jumping

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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The Giro Quarter is a good option for a range of riding. It's primarily marketed by Giro as a mountain bike/jump helmet (as you can see here) but it's a useful lid for city cycling too, especially if you're on an e-bike (or it's flat round your way) and you're not working up much of a sweat.

  • Pros: Good coverage, pretty comfortable
  • Cons: You'll get sweaty if you ride too hard

Construction-wise there's an ABS shell and an EPS liner, with a polyurethane coating on the exposed bits to protect it from damage. Eight vents let a bit of air circulate. The straps are riveted onto the outer shell, and there are two sets of pads to adjust the fit; three sizes are available. You should be able to dial in a decent fit, although it's not as adjustable as a road lid, for example.

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The white lid we had was a bit prone to picking up marks; one of the darker colours (six colours are available) would probably be a better option.


In use, the Quarter is pretty comfy. It extends a fair way down at the back and the pads do a good job of keeping it in place in the absence of any formal retention system. Other than the straps, or course.


The two air vents at the front do let in a bit of breeze when you're riding at a cruising pace, and there are four vents in the top to allow rising hot air out, and two at the back too.


Obviously it's not the breeziest of lids and if you're working hard you'll soon get a bit of sweat build up, especially in the front pad. But if you're cruising around town, or you're on an e-bike and not working that hard, you'll stay cool and comfortable. On the flip side, it's warm enough for cold weather and offers plenty of head protection if it's raining too.


It's very good value at £35, but you can go cheaper: B'Twin's 500 road helmet, for example, is £29.99 (and its 500 mountain bike lid is just £17.99). Have a look at more in our buyer's guide, linked below.

> Buyer's Guide: 8 of the best cheap cycling helmets

At 425g the Quarter isn't as light as a road helmet (the B'Twin 500 mentioned above is a claimed 270g) but it doesn't feel like too much of a burden. It's a good option if you're looking for something that doesn't look too sporty for city riding. Or if you want to go jumping down the woods.


Good option for leisurely city riding. And dirt jumping

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Make and model: Giro Quarter helmet

Size tested: Medium

Tell us what the product is for

Giro says, "The Quarter™ is one of the lowest-profile helmets we've ever made, and it's also the lightest we've made with an ABS shell. The essentials are here – an EPS liner for impact management, a tough outer shell, riveted webbing anchors and plush, sweat absorbent pads that are easy to swap for dialing in the fit. Another standout feature – the polyurethane coating helps to protect the EPS liner from daily wear and tear. Available in a bunch of great colors and three Super Fit™ sizes."

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

From Giro:


Polyurethane Bumper helps to protect EPS Liner


ABS Shell with EPS Liner

Fit System

Fit Kit Padding


8 vents

Rate the product for quality of construction:
Rate the product for performance:
Rate the product for durability:
Rate the product for weight (if applicable)
Rate the product for comfort (if applicable)
Rate the product for value:

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

I didn't do much dirt jumping but it works well as a leisure/city lid.

Tell us what you particularly liked about the product

Pretty comfy, fairly low profile.

Tell us what you particularly disliked about the product

Can get a bit sweaty at times.

Did you enjoy using the product? Yes

Would you consider buying the product? Maybe

Would you recommend the product to a friend? Maybe

Use this box to explain your overall score

It's a good lid: I'm not really using it for its designed use here but I've enjoyed wearing it, especially on the e-bike.

Overall rating: 7/10

About the tester

Age: 44  Height: 189cm  Weight: 94kg

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, mountain biking, 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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