Giro Source vs Radix

Giro is one of the best bike helmet brands that you can count on because they have some of the best helmets in the market such as the Giro Source Vs Radix which are designed for those who want to ride safely when challenging the more extreme terrains. These helmets are not only cool looking from the outside but also comfortable and easy to wear. However, the two are not exactly the same so before deciding to choose one, let’s see what they can offer below.

In this comparison, we are going to talk about:

  • How to Select for a Bike Helmet
  • What are Giro Source and Radix
  • How are the Design of Giro Source and Radix
  • How are the Build Quality of Giro Source and Radix
  • How are the Fitting of Giro Source and Radix
  • Are Giro Source and Radix Comfortable
  • Giro Source Vs Radix

Bike Helmets

Bike helmets are the necessary gear that every cyclist has to wear for safety reasons. They may not be able to cover the whole body or let you go without any scratch but it is good to wear one in order to minimize the impact that may happen during the activity. There are so many good options as well and typically regular road helmets are not very expensive which is why we do think most of us can wear one without any issue.

However, it is best to shop wisely because not all bike helmets will match your head and this is a tricky one as just like the body, we may have different head size and shape, including the hairstyle that perhaps can get in the way of a perfect fitting. This is why bike helmets are offered in various sizes or styling to help users find the best match for their head. This can range from small to extra-large and even bigger but some options are universally sized too.

If this is your first bike helmet, try measuring the head size or around the circumference of the head to know the measurement. Write it down or remember it as a guide to find the correct sizing and if possible, try getting one that is not too close to the smallest or largest size but more in the middle thus, we have more room to tweak the sizing. In most cases they are in a range from one point to another so one helmet can be worn by some people with similar head sizes and shapes.

The adjustment is usually located at the back of the helmet just above your neck but in some models they can be at the top of the helmet as well, such as in Lazer Blade Vs Z1. They are in the form of a rotating knob so we will only need to rotate it to find, tighten or loosen the fit.

Not only sizing, it is important to find the helmet that is made for the riding discipline because not all of us will be riding the bike on the same terrain. In general, bike helmets are separated into road and MTB types in which the latter will be heavier but also provide more coverage especially on the back of the head. Some trail or MTB helmets are also full-face with chin protectors to cover the face area when you are more on the extreme side but naturally they will be heavier and probably far less comfortable than typical half lid style.

Giro Source Giro Radix
Product Dimensions16 x 11 x 9 inches14 x 10 x 8 inches
Shipping Weight1 Pounds1.6 Pounds
Best offerCheck priceCheck price

About Giro Source and Radix

Now when you are ready to buy the perfect helmet, it is time to see what the market has to offer as there are more than plenty of them out there. These helmets come from various brands or manufacturers but also in different types and different price ranges. Depending on which seems to work best in the application we should go for the option that matches both the riding discipline as well as fitting. It can be quite confusing for the amount of options but it is great to let you choose freely.

When it comes to bike helmets, Giro is one of the best brands that we can rely on. This brand is covering a wide range of options based on the riding discipline and the styling or price range that you will want to spend. They can be for road application or trail and also provide adult or children helmets too so if your kids love cycling, we can check out their collection as well. What we love the most from Giro is they seem to always have the option for your preference. 

Among the collection, for those who will ride their bike on trails or the more extreme terrain than regular road, the brand has Giro Source and Radix that are ideal for this type of application. Coming from the same brand the two are going to be quite similar to each other which is why it can get confusing to choose one but they are not exactly the same and what sets the two apart prominently is actually their styling or the design of the helmet.

The Radix is a bit unique and quite different from the common trail helmets we have seen previously from Giro but it can give you a different look or how you like the two appear when worn. In addition, the techs are mostly similar to each other so they will be very similar in terms of performance. However, between Giro Source and Radix, the latter have the more vents so if you are concerned about cooling effects, this helmet can be a very promising one.

Giro Source and Radix Design

As it has been mentioned above, the prominent difference between the two is actually their styling because Radix probably looks sportier here. It has small vents all over the helmet’s surface in which Source does incorporate larger vents but only on a few chosen spots. The shape and angles of these vents are also quite different which is why they look quite far apart in terms of styling. But, the material and build quality seems to be identical which is equally good.

These helmets are available in several sizes from small to extra-large to fit a wide range of users’ head circumference. As for the weight, we are surprised that Radix is noticeably lighter than Source at 316 grams while the other helmet is 351 grams for the same medium size and with CPSC certification. In addition, if you like colorful helmets, the two are also available in various different shades to choose from.

Giro Source and Radix Build Quality

Moving further, let’s see what the Giro Source and Radix can offer starting from the basics which is build quality. These helmets are very well-made and we do think they will last for quite the time. The two are made using in-mold construction with a polycarbonate shell and EPS foam on the inside so the material separation should not be an issue. We also love the fact that they are fully covered which is not always what you get on road bike helmets.

The outer rim of the unit is all covered with the hard shell to ensure longevity and higher durability while on the inside they are also featured with MIPS. This additional safety feature is like a slip plane to allow the helmet to move slightly while being worn thus, when there is an impact, it can reduce some of the energy transferred compared to when the helmet is tightly fit and firm on the head.

Giro Source and Radix Fitting System

Next we want to talk about the fitting system and again, both Giro Source and Radix are using the same fitting here with Roc Loc 5. The Roc Loc found in Giro helmets are mostly similar to each other and this is adjusted through the rear small knob below the helmet. It is connected to the internal structure of the helmet so when rotated it can affect the fitting of the inside to loosen it or tighten it. It is a very easy to use system and should fit lots of people.

The chin strap is standard however but they are working good and not harsh on the skin if you often find the material scratching the cheek or chin area. The clip is standard too and it is light enough to keep the helmet in place while you pedal the bike.

Giro Source and Radix Comfort

Lastly, we want to talk about the comfort of Giro Source and Radix which are kind of similar but not the same. First, the Radix comes with a total of 25 vents while Source is 16 and the placement is different. They are not the most cooling helmet out there but works really well, especially thanks to the internal channeling that are coming with the two. Second, the visor may not be as useful because they are too short for some people and in comparison Radix is shorter than the already shallow moto-style peak on the other.

Giro Source vs Radix

These helmets are good for those who want to ride the bike on the more extreme terrain. They are very comfortable and well-built but the amount of small and angled vents on Radix is very promising when it comes to cooling the head. It has a shorter peak however which we personally not fond of as it limits the benefit yet, this probably helps this helmet to shave some of its weight too if you like a lighter lid.

- MARKET-LEADING PERFORMANCE AND PROTECTION: Engineered in Giro’s helmet test lab.
- INTEGRATED MIPS: MIPS Brain Protection System is integrated with the Roc Loc 5 Air Fit System for an added measure of protection in certain impacts plus market-leading fit and comfort.
- LIGHTWEIGHT AND DURABLE: In-molding construction eliminates excess weight and permanently fuses tough polycarbonate outer shell to the interior liner.
- VENTILATION AND COMFORT: 17 vents coupled with internal channeling allow air to flow through the helmet to enhance cooling power. Easily adjust vertical position and fit tension with the Roc Loc 5 MIPS fit system
- MARKET-LEADING PROTECTION: Engineered in Giro’s category-leading helmet test lab
- MIPS: Utilizes the Multi-Directional Impact Protection System to redirect energy in a crash
- COMFORT: Easily adjust vertical position and tension with the Roc Loc 5.5 fit system
- RUGGED: In-molding construction.


Depending on which seems to fit you the most, our choice may vary but among the two we will recommend Redix if you love a light, cooling helmet and don’t really need the visor but if you prefer the rounder styling of Source, this helmet is still very comfy to wear.

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