Giro Helmets

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Giro 121

Size

XS 15
SM 55
MD 41
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50% Off Full Price Pre-Order

Giro

Giro Source MIPS Helmet Matt Black Fade

Regular price $119.00 Full price

Sale price $119.00

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Giro Register II MIPS Youth Helmet Black UNI 50-57cm

25% Off Full Price Pre-Order

Giro

Giro Register II MIPS Youth Helmet Black UNI 50-57cm

Regular price $74.00 Full price

Sale price $74.00

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Regular price $99.00 Full price

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Giro Quarter FS BMX/Skate Helmet Matte Black

25% Off Full Price Pre-Order

Giro

Giro Quarter FS BMX/Skate Helmet Matte Black

Regular price $81.00 Full price

Sale price $81.00

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Regular price $109.00 Full price

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Giro Quarter FS Adult MTB Helmet Matte Black

24% Off Full Price Pre-Order

Giro

Giro Quarter FS Adult MTB Helmet Matte Black

Regular price $75.00 Full price

Sale price $75.00

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Giro Quarter FS Adult MTB Helmet Matte Chalk

24% Off Full Price Pre-Order

Giro

Giro Quarter FS Adult MTB Helmet Matte Chalk

Regular price $75.00 Full price

Sale price $75.00

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Giro Fixture MIPS II MTB Helmet Matte Black/Grey UNI 54-61cm

21% Off Full Price Pre-Order

Giro

Giro Fixture MIPS II MTB Helmet Matte Black/Grey UNI 54-61cm

Regular price $118.00 Full price

Sale price $118.00

Club price

Regular price $149.99 Full price

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Giro Fixture Youth MIPS II MTB Helmet Matte Black/Vivid Green UNI Youth 50-57cm

21% Off Full Price Pre-Order

Giro

Giro Fixture Youth MIPS II MTB Helmet Matte Black/Vivid Green UNI Youth 50-57cm

Regular price $118.00 Full price

Sale price $118.00

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Regular price $149.99 Full price

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Giro Fixture MIPS II MTB Helmet UNI Dark Sage

21% Off Full Price Pre-Order

Giro

Giro Fixture MIPS II MTB Helmet UNI Dark Sage

Regular price $118.00 Full price

Sale price $118.00

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Regular price $149.99 Full price

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Giro Fixture Youth MIPS II MTB Helmet Matte Light Pink/Purple Fade UNI Youth 50-57cm

21% Off Full Price Pre-Order

Giro

Giro Fixture Youth MIPS II MTB Helmet Matte Light Pink/Purple Fade UNI Youth 50-57cm

Regular price $118.00 Full price

Sale price $118.00

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Regular price $149.99 Full price

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Giro Fixture MIPS II MTB Helmet Matte White/Grey UNI 54-61cm

21% Off Full Price Pre-Order

Giro

Giro Fixture MIPS II MTB Helmet Matte White/Grey UNI 54-61cm

Regular price $118.00 Full price

Sale price $118.00

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Regular price $149.99 Full price

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5% Off Full Price MIPS Pre-Order

Giro

Giro Agilis MIPS Helmet Matte White

Regular price $165.00 Full price

Sale price $165.00

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Regular price $199.99 Full price

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Giro Fixture MIPS II Womens MTB Helmet Matte Dark Maroon UNI 50-57cm

21% Off Full Price Pre-Order

Giro

Giro Fixture MIPS II Womens MTB Helmet Matte Dark Maroon UNI 50-57cm

Regular price $118.00 Full price

Sale price $118.00

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Regular price $149.99 Full price

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Giro Fixture MIPS Youth Helmet Green Rush UNI 50-57cm

21% Off Full Price Pre-Order

Giro

Giro Fixture MIPS Youth Helmet Green Rush UNI 50-57cm

Regular price $118.00 Full price

Sale price $118.00

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Regular price $149.99 Full price

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Giro Fixture MIPS II MTB Helmet Matte Titanium UNI 54-61cm

21% Off Full Price Pre-Order

Giro

Giro Fixture MIPS II MTB Helmet Matte Titanium UNI 54-61cm

Regular price $118.00 Full price

Sale price $118.00

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Regular price $149.99 Full price

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Giro Fixture MIPS II Womens MTB Helmet Matte Black/Stone UNI 50-57cm

21% Off Full Price Pre-Order

Giro

Giro Fixture MIPS II Womens MTB Helmet Matte Black/Stone UNI 50-57cm

Regular price $118.00 Full price

Sale price $118.00

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Regular price $149.99 Full price

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Giro Fixture MIPS II Womens MTB Helmet Matte Sky Blue UNI 50-57cm

21% Off Full Price Pre-Order

Giro

Giro Fixture MIPS II Womens MTB Helmet Matte Sky Blue UNI 50-57cm

Regular price $118.00 Full price

Sale price $118.00

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Regular price $149.99 Full price

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Giro Fixture Youth MIPS II MTB Helmet Matte Aqua Green/Blue Jewel Fade UNI Youth 50-57cm

21% Off Full Price Pre-Order

Giro

Giro Fixture Youth MIPS II MTB Helmet Matte Aqua Green/Blue Jewel Fade UNI Youth 50-57cm

Regular price $118.00 Full price

Sale price $118.00

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Regular price $149.99 Full price

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Pre-Order

Giro

Giro Agilis MIPS Road Helmet Matt Black

Regular price $165.00 Full price

Sale price $165.00

Club price

Regular price $199.00 Full price

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Giro Scamp II Kids Helmet Matte Pink/Green Fade SM 49-53cm

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Giro

Giro Scamp II Kids Helmet Matte Pink/Green Fade SM 49-53cm

Regular price $95.00 Full price

Sale price $95.00

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Regular price $99.00 Full price

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Giro Scamp II Kids Helmet Matte Blue Jewel

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Giro

Giro Scamp II Kids Helmet Matte Blue Jewel

Regular price $95.00 Full price

Sale price $95.00

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Regular price $99.00 Full price

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Giro Coalition Spherical Full Face Helmet Matte Black

21% Off Full Price Pre-Order

Giro

Giro Coalition Spherical Full Face Helmet Matte Black

Regular price $449.00 Full price

Sale price $449.00

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Regular price $569.00 Full price

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Giro Isode II MIPS MTB Helmet Matte Black 2026

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Giro

Giro Isode II MIPS MTB Helmet Matte Black 2026

Regular price $125.00 Full price

Sale price $125.00

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Regular price $139.00 Full price

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Giro Scamp II Kids Helmet Matte Blue/Rainbows

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Giro

Giro Scamp II Kids Helmet Matte Blue/Rainbows

Regular price $95.00 Full price

Sale price $95.00

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Regular price $99.00 Full price

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Giro Scamp II Kids Helmet Matte Purple Lava SM 49-53cm

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Giro

Giro Scamp II Kids Helmet Matte Purple Lava SM 49-53cm

Regular price $95.00 Full price

Sale price $95.00

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Regular price $99.00 Full price

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Giro Fixture MIPS II MTB Helmet Matte Black/Grey UNI XL 58-65cm

21% Off Full Price Pre-Order

Giro

Giro Fixture MIPS II MTB Helmet Matte Black/Grey UNI XL 58-65cm

Regular price $118.00 Full price

Sale price $118.00

Club price

Regular price $149.99 Full price

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Giro Fixture MIPS II Womens MTB Helmet Matte White UNI 50-57cm

21% Off Full Price Pre-Order

Giro

Giro Fixture MIPS II Womens MTB Helmet Matte White UNI 50-57cm

Regular price $118.00 Full price

Sale price $118.00

Club price

Regular price $149.99 Full price

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Giro Helios Spherical MIPS Helmet Matte Black/Red

53% Off Full Price Clearance Pre-Order

Giro

Giro Helios Spherical MIPS Helmet Matte Black/Red

Regular price $230.00 Full price

Sale price $230.00

Club price

Regular price $499.90 Full price

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Giro Scamp II Kids Helmet Matte Pink/Green Fade XS 45-49cm

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Giro

Giro Scamp II Kids Helmet Matte Pink/Green Fade XS 45-49cm

Regular price $95.00 Full price

Sale price $95.00

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Regular price $99.00 Full price

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Giro Agilis MIPS Helmet Matte Black Fade

25% Off Full Price MIPS Pre-Order

Giro

Giro Agilis MIPS Helmet Matte Black Fade

Regular price $149.00 Full price

Sale price $149.00

Club price

Regular price $199.99 Full price

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Helmet Giro Scamp II Kids Helmet Matte Blue/Green Towers

3% Off Full Price Pre-Order

Giro

Helmet Giro Scamp II Kids Helmet Matte Blue/Green Towers

Regular price $84.00 Full price

Sale price $84.00

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Regular price $99.99 Full price

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Giro Isode II MIPS Road Helmet Matte White UNI 54-61cm

Pre-Order

Giro

Giro Isode II MIPS Road Helmet Matte White UNI 54-61cm

Regular price $125.00 Full price

Sale price $125.00

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Regular price $139.00 Full price

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Giro Isode MIPS II Helmet Matte Black/Charcoal 54-61cm

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Giro

Giro Isode MIPS II Helmet Matte Black/Charcoal 54-61cm

Regular price $134.00 Full price

Sale price $134.00

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Regular price $149.00 Full price

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Giro Aerohead MIPS II Road Aero Helmet Matte Black

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Giro

Giro Aerohead MIPS II Road Aero Helmet Matte Black

Regular price $921.00 Full price

Sale price $921.00

Club price

Regular price $949.00 Full price

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Pre-Order

Giro

Giro Hoxton MIPS BMX Helmet Matte Black

Regular price $193.00 Full price

Sale price $193.00

Club price

Regular price $198.99 Full price

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Find Your Size

Step 1: Measure your height

Take off your shoes
Stand with your back straight against a wall
Balance a book on your head to mark your height on the wall
Measure your height by the distance from the floor to the mark

Your height:

Find Your Size

Step 2: Adjust your inseam

Based on your height, we’ve calculated a starting point.
You can measure your inseam by tucking a book between your legs so there is pressure but it isn’t uncomfortable.
Inseam typically falls with 5cm of the average.

Your inseam:

Find Your Size

Your results

For the we suggest the following size.

More comfort More speed

Height: --

Inseam: --

Adjusted Height: --

We can't make a recommendation on size for the based on your details.

Finding the right sized bike for you is important to get the most enjoyment out of your new bike. Either the size for you isn't available at your store, we don’t have the required data or your height is outside the range of this bike.

If you head instore our team will provide a free professional measure up and recommend the best bikes to suit your needs or you can reach out to our customer service team who can provide you with more guidance over the phone.

Call 0800 000 283 for Customer Service

Find Your Size

We have saved your measurements.

Recommended sizes will now be highlighted on the page.

Giro was founded more than 30 years ago by Jim Gentes, a man with an obsession for design and answering unmet needs. That obsession led him to start making his own products, and ultimately resulted in a company committed to serving the rider through personal expression and advanced performance. Our world has changed dramatically in the past three decades, but Giro has remained steadfastly committed to serving enthusiast riders. Giro is the brand that sweats the details because they understand that riding is more than just a fleeting hobby or a passing fad. Riding is the best part of a great life and your equipment deserves attention to even the smallest of details.