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Mountain Bike Helmets

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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.

Lazer Lupo Kineticore MTB Helmet Matte Fern Green
34% Off Full Price

Lazer

Lazer Lupo Kineticore MTB Helmet Matte Fern Green

$99.00 Full price
$99.00
Club price
$149.99 Full price
Raven Corvus MTB Helmet with Magnetic Clip Satin Blue MD/LG
34% Off Full Price

Raven

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

$59.00 Full price
$59.00
Club price
$89.99 Full price
Met Echo Helmet Black Matte MD/LG
40% Off Full Price

Met

Met Echo Helmet Black Matte MD/LG

$78.00 Full price
$78.00
Club price
$129.99 Full price
Bell 4Forty Air MIPS Helmet Matte Black
28% Off Full Price MIPS

Bell

Bell 4Forty Air MIPS Helmet Matte Black

$179.00 Full price
$179.00
Club price
Met Terranova MIPS Trail/E-Bike Helmet Black
35% Off Full Price Clearance

Met

Met Terranova MIPS Trail/E-Bike Helmet Black

From $149.00 Full price
From $149.00
Club price
$229.95 Full price
Lazer Lupo Kineticore MTB Helmet Matte Mint UNI
34% Off Full Price

Lazer

Lazer Lupo Kineticore MTB Helmet Matte Mint UNI

$99.00 Full price
$99.00
Club price
$149.99 Full price
Fox Speedframe MIPS Helmet Black
25% Off Full Price MIPS

FOX

Fox Speedframe MIPS Helmet Black

$149.00 Full price
$149.00
Club price
$199.95 Full price
FOX Mainframe TRVRS MIPS MTB Helmet Red
31% Off Full Price

FOX

FOX Mainframe TRVRS MIPS MTB Helmet Red

$125.00 Full price
$125.00
Club price
$179.99 Full price
Lazer Lupo Kineticore MTB Helmet Matte Black
34% Off Full Price

Lazer

Lazer Lupo Kineticore MTB Helmet Matte Black

$99.00 Full price
$99.00
Club price
$149.99 Full price
Lazer Lupo Kineticore MTB Helmet Matte White/Stone
34% Off Full Price

Lazer

Lazer Lupo Kineticore MTB Helmet Matte White/Stone

$99.00 Full price
$99.00
Club price
$149.99 Full price
FOX Mainframe MIPS MTB Helmet Black
MIPS

FOX

FOX Mainframe MIPS MTB Helmet Black

$159.00 Full price
$159.00
Club price
$179.95 Full price
Giro Fixture MIPS II Womens MTB Helmet Matte Sky Blue UNI 50-57cm

Giro

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

$118.00 Full price
$118.00
Club price
$149.99 Full price
Giro Fixture MIPS II MTB Helmet Matte Black/Grey UNI 54-61cm

Giro

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

$118.00 Full price
$118.00
Club price
$149.99 Full price
Raven Corvus MTB Helmet with Magnetic Clip Satin Black MD/LG
34% Off Full Price

Raven

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

$59.00 Full price
$59.00
Club price
$89.99 Full price
Giro Fixture MIPS II MTB Helmet Matte White/Grey UNI 54-61cm

Giro

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

$118.00 Full price
$118.00
Club price
$149.99 Full price
Raven Corvus MTB Helmet with Magnetic Clip Satin Grey MD/LG
34% Off Full Price

Raven

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

$59.00 Full price
$59.00
Club price
$89.99 Full price
Fox Youth Mainframe MIPS CE MTB Helmet Black
31% Off Full Price MIPS

FOX

Fox Youth Mainframe MIPS CE MTB Helmet Black

$125.00 Full price
$125.00
Club price
$179.95 Full price
Giro Fixture II MIPS MTB Helmet UNI Dark Sage

Giro

Giro Fixture II MIPS MTB Helmet UNI Dark Sage

$118.00 Full price
$118.00
Club price
$149.99 Full price
Giro Fixture MIPS II Womens MTB Helmet Matte Black/Stone UNI 50-57cm

Giro

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

$118.00 Full price
$118.00
Club price
$149.99 Full price
Giro Fixture MIPS II MTB Helmet Matte Titanium UNI 54-61cm

Giro

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

$118.00 Full price
$118.00
Club price
$149.99 Full price
Giro Fixture MIPS II MTB Helmet Matte Black/Grey UNI XL 58-65cm

Giro

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

$118.00 Full price
$118.00
Club price
$149.99 Full price
Raven BMX Helmet Satin Black

Raven

Raven BMX Helmet Satin Black

$64.99 Full price
$64.99
Club price
$69.98 Full price
Fox Mainframe MIPS Helmet Black
MIPS

FOX

Fox Mainframe MIPS Helmet Black

$139.00 Full price
$139.00
Club price
$169.99 Full price
Met Echo Helmet Off-White Bronze Matte
40% Off Full Price

Met

Met Echo Helmet Off-White Bronze Matte

$78.00 Full price
$78.00
Club price
$129.98 Full price
Giro Fixture MIPS II Womens MTB Helmet Matte Dark Maroon UNI 50-57cm

Giro

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

$118.00 Full price
$118.00
Club price
$149.99 Full price
Fox Mainframe MIPS MTB Helmet White 2025
MIPS

FOX

Fox Mainframe MIPS MTB Helmet White 2025

$159.00 Full price
$159.00
Club price
$179.99 Full price
Giro Fixture II MIPS MTB Helmet Matte Trim Blue UNI
NEW

Giro

Giro Fixture II MIPS MTB Helmet Matte Trim Blue UNI

$118.00 Full price
$118.00
Club price
$149.99 Full price
Giro Fixture MIPS II MTB Helmet Matte Flame Red UNI 54-61cm

Giro

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

$145.00 Full price
$145.00
Club price
$149.00 Full price
Giro Fixture MIPS II Helmet Matte Ano Lime Uni
MIPS

Giro

Giro Fixture MIPS II Helmet Matte Ano Lime Uni

$118.00 Full price
$118.00
Club price
$150.00 Full price
Giro Source MIPS Helmet Matt Black Fade

Giro

Giro Source MIPS Helmet Matt Black Fade

From $205.00 Full price
From $205.00
Club price
$239.99 Full price
Bell Helmet 4Forty MIPS Black
MIPS

Bell

Bell Helmet 4Forty MIPS Black

From $231.00 Full price
From $231.00
Club price
$289.99 Full price
Giro Fixture MIPS II Bike Helmet Matte Black/Titanium
MIPS

Giro

Giro Fixture MIPS II Bike Helmet Matte Black/Titanium

$118.00 Full price
$118.00
Club price
$150.00 Full price
Bell Spark 2 MIPS Helmet Matte Yellow Hi-Vis

Bell

Bell Spark 2 MIPS Helmet Matte Yellow Hi-Vis

$205.00 Full price
$205.00
Club price
$215.99 Full price
Met Echo Helmet Black Matte SM/MD

Met

Met Echo Helmet Black Matte SM/MD

$99.00 Full price
$99.00
Club price
$129.99 Full price
Giro Radix MIPS Helmet Black
30% Off Full Price MIPS

Giro

Giro Radix MIPS Helmet Black

From $153.00 Full price
From $153.00
Club price
$219.99 Full price
Bell Spark 2 MIPS Helmet Matte Black

Bell

Bell Spark 2 MIPS Helmet Matte Black

$205.00 Full price
$205.00
Club price
$215.99 Full price

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
cm

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.
cm

Find Your Size

Your results

For the we suggest the following size.

More comfort More speed
Height: --
Inseam: --
Adjusted Height: --

Find Your Size

We have saved your measurements.

Recommended sizes will now be highlighted on the page.

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.
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5% BEST PRICE GUARANTEE

We beat any price by 5%
CLICK AND COLLECT

CLICK AND COLLECT

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CLUB 99 MEMBERSHIP

CLUB 99 MEMBERSHIP

Exclusive club benefits
FREE SHIPPING OVER $99*

FREE SHIPPING OVER $99*

*Excluding bikes/bulky items