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100% 4
Bell 13
Bluegrass 3
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Size

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Not sure what sized bike is best?

Answer a few short questions and we'll make a recommendation on which size is best for you.

35% Off Full Price Pre-Order

FOX Dropframe MIPS MTB Helmet Medium Black

FOX

FOX Dropframe MIPS MTB Helmet Medium Black

Regular price $285.00 Full price

Sale price $285.00

Club price

Regular price $439.95 Full price

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30% Off Full Price Pre-Order

FOX Dropframe Pro MIPS MTB Helmet Matte Black

FOX

FOX Dropframe Pro MIPS MTB Helmet Matte Black

Regular price $384.00 Full price

Sale price $384.00

Club price

Regular price $549.95 Full price

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30% Off Full Price Pre-Order

FOX

FOX Mainframe TRVRS MIPS MTB Helmet Red

Regular price $125.00 Full price

Sale price $125.00

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Regular price $179.99 Full price

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35% Off Full Price Pre-Order

FOX Crossframe Pro MIPS MTB Helmet Matte Black

FOX

FOX Crossframe Pro MIPS MTB Helmet Matte Black

Regular price $285.00 Full price

Sale price $285.00

Club price

Regular price $439.95 Full price

Unit price

/per

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30% Off Full Price MIPS Pre-Order

Fox Youth Mainframe MIPS CE MTB Helmet Black

FOX

Fox Youth Mainframe MIPS CE MTB Helmet Black

Regular price $125.00 Full price

Sale price $125.00

Club price

Regular price $179.95 Full price

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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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/per

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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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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

Club price

Regular price $149.99 Full price

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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

Club price

Regular price $149.99 Full price

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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

Club price

Regular price $149.99 Full price

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/per

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30% Off Full Price MIPS Pre-Order

FOX

Fox Speedframe MIPS Helmet Black

Regular price $139.00 Full price

Sale price $139.00

Club price

Regular price $199.99 Full price

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/per

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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

Club price

Regular price $149.99 Full price

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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

Club price

Regular price $149.99 Full price

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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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/per

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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

Club price

Regular price $149.99 Full price

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21% Off Full Price Pre-Order

Lazer

Lazer Lupo Kineticore MTB Helmet Matte Black UNI 55-61cm

Regular price $118.00 Full price

Sale price $118.00

Club price

Regular price $149.99 Full price

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/per

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Pre-Order

Raven

Raven Corvus MTB Helmet with Magnetic Clip Satin Black MD/LG

Regular price $79.00 Full price

Sale price $79.00

Club price

Regular price $89.99 Full price

Unit price

/per

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21% Off Full Price Pre-Order

Lazer

Lazer Lupo Kineticore MTB Helmet Matte White/Stone

Regular price $118.00 Full price

Sale price $118.00

Club price

Regular price $149.99 Full price

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35% Off Full Price Pre-Order

FOX Crossframe Pro Solids MIPS MTB Helmet White

FOX

FOX Crossframe Pro Solids MIPS MTB Helmet White

Regular price $285.00 Full price

Sale price $285.00

Club price

Regular price $439.95 Full price

Unit price

/per

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20% Off Full Price Pre-Order

Lazer

Lazer Coyote KinetiCore MTB Helmet Matte Black UNI 52-56cm

Regular price $159.00 Full price

Sale price $159.00

Club price

Regular price $199.99 Full price

Unit price

/per

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20% Off Full Price Pre-Order

Fox Speedframe Pro MIPS MTB Helmet Matte Black

FOX

Fox Speedframe Pro MIPS MTB Helmet Matte Black

Regular price $319.00 Full price

Sale price $319.00

Club price

Regular price $399.99 Full price

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21% Off Full Price Pre-Order

Lazer

Lazer Lupo Kineticore MTB Helmet Matte Mint UNI

Regular price $118.00 Full price

Sale price $118.00

Club price

Regular price $149.99 Full price

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20% Off Full Price MIPS Pre-Order

Bell

Bell Helmet 4Forty MIPS Black

Regular price From $231.00 Full price

Sale price From $231.00

Club price

Regular price $289.99 Full price

Unit price

/per

Size

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Pre-Order

Bell

Bell Spark 2 MIPS Helmet Matte Yellow Hi-Vis

Regular price $205.00 Full price

Sale price $205.00

Club price

Regular price $215.99 Full price

Unit price

/per

Size

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SM/MD

MD/LG

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Pre-Order

Giro

Giro Radix MIPS MTB Helmet Matte Sky Blue Pulse

Regular price $175.00 Full price

Sale price $175.00

Club price

Regular price $199.99 Full price

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Pre-Order

Giro

Giro Radix MIPS MTB Helmet Matte Black

Regular price $175.00 Full price

Sale price $175.00

Club price

Regular price $199.99 Full price

Unit price

/per

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20% Off Full Price Pre-Order

Lazer

Lazer Coyote KinetiCore MTB Helmet Matte White

Regular price $159.00 Full price

Sale price $159.00

Club price

Regular price $199.99 Full price

Unit price

/per

Size

Translation missing: en.products.product.variant_options

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Pre-Order

Raven

Raven Corvus MTB Helmet with Magnetic Clip Satin Grey MD/LG

Regular price $79.00 Full price

Sale price $79.00

Club price

Regular price $89.99 Full price

Unit price

/per

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47% Off Full Price Clearance Pre-Order

Met Terranova MIPS Trail/E-Bike Helmet Black

Met

Met Terranova MIPS Trail/E-Bike Helmet Black

Regular price $120.00 Full price

Sale price $120.00

Club price

Regular price $229.95 Full price

Unit price

/per

Size

Translation missing: en.products.product.variant_options

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MIPS Pre-Order

Fox Mainframe MIPS MTB Helmet White 2025

FOX

Fox Mainframe MIPS MTB Helmet White 2025

Regular price $159.00 Full price

Sale price $159.00

Club price

Regular price $179.99 Full price

Unit price

/per

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21% Off Full Price Pre-Order

Giro

Giro Source MIPS Helmet Matt Black Fade

Regular price $189.00 Full price

Sale price $189.00

Club price

Unit price

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21% Off Full Price Pre-Order

Lazer

Lazer Lupo Kineticore MTB Helmet Matte Black

Regular price $118.00 Full price

Sale price $118.00

Club price

Regular price $149.99 Full price

Unit price

/per

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Pre-Order

Giro

Giro Radix MIPS MTB Helmet Matte White

Regular price $175.00 Full price

Sale price $175.00

Club price

Regular price $199.99 Full price

Unit price

/per

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Pre-Order

Giro

Giro Montaro MIPS III MTB Helmet Matte Dark Sage

Regular price $269.00 Full price

Sale price $269.00

Club price

Regular price $299.99 Full price

Unit price

/per

Size

Translation missing: en.products.product.variant_options

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Pre-Order

Giro

Giro Montaro MIPS III MTB Helmet Matte White

Regular price $269.00 Full price

Sale price $269.00

Club price

Regular price $299.99 Full price

Unit price

/per

Size

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Pre-Order

Giro

Giro Montaro MIPS III MTB Helmet Matte Black

Regular price $269.00 Full price

Sale price $269.00

Club price

Regular price $299.99 Full price

Unit price

/per

Size

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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.

Shop Your Local Store

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Available now at your store

Available now at your selected store for same-day pickup.

Available at nearby stores

Not in-stock at your chosen store but in stock at nearby stores.

Can be ordered into your store

Not in stock locally, but we can order it in for you.

Pre-Order

Not in stock at any stores yet, but can be pre-ordered with a deposit.

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Select all options

Mountain bike helmets are made for a specific genre of cycling to improve performance and meet the demands of riders needs. Like all quality cycling helmets, MTB helmets should be lightweight, well ventilated and the correct fit for your head size. It is important to buy a helmet that is a snug fit, as the last thing that you want is for your helmet to move around when you’re flying down a steep descent. Shop the best range of mountain bike helmets from quality brands. You can be sure you're buying the best helmet at the best price with our Best Price Guarantee. Shop online with click & collect and delivery, and in store at your local 99 Bikes in Auckland, Christchurch & Wellington.

Mountain Bike Helmets

Kids Helmets

Recreational Helmets

Triathlon Helmets

Road Bike Helmets

Find Your Size

Step 1: Measure your height

Find Your Size

Step 2: Adjust your inseam

Find Your Size

Your results

Find Your Size

We have saved your measurements.

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