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Adults Bicycle Helmets

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Fox Youth Mainframe MIPS CE MTB Helmet Black
40% Off Full Price MIPS

FOX

Fox Youth Mainframe MIPS CE MTB Helmet Black

$107.00 Full price
$107.00
Club price
$179.95 Full price
Lazer Strada KinetiCore Helmet White
49% Off Full Price

Lazer

Lazer Strada KinetiCore Helmet White

$95.00 Full price
$95.00
Club price
$189.99 Full price
FOX Crossframe Pro Solids MIPS MTB Helmet White
35% Off Full Price

FOX

FOX Crossframe Pro Solids MIPS MTB Helmet White

$285.00 Full price
$285.00
Club price
$439.95 Full price
FOX Mainframe TRVRS MIPS MTB Helmet Red
40% Off Full Price

FOX

FOX Mainframe TRVRS MIPS MTB Helmet Red

$107.00 Full price
$107.00
Club price
$179.99 Full price
Giro Quarter FS BMX/Skate Helmet Matte Black
25% Off Full Price

Giro

Giro Quarter FS BMX/Skate Helmet Matte Black

$81.00 Full price
$81.00
Club price
$109.00 Full price
Fox Mainframe MIPS MTB Helmet White 2025
24% Off Full Price MIPS

FOX

Fox Mainframe MIPS MTB Helmet White 2025

$135.00 Full price
$135.00
Club price
$179.99 Full price
Giro Quarter FS Adult MTB Helmet Matte Black
24% Off Full Price

Giro

Giro Quarter FS Adult MTB Helmet Matte Black

$75.00 Full price
$75.00
Club price
FOX Mainframe MIPS MTB Helmet Black
24% Off Full Price MIPS

FOX

FOX Mainframe MIPS MTB Helmet Black

$135.00 Full price
$135.00
Club price
$179.95 Full price
Giro Quarter FS Adult MTB Helmet Matte Chalk
24% Off Full Price

Giro

Giro Quarter FS Adult MTB Helmet Matte Chalk

$75.00 Full price
$75.00
Club price
Lazer Cityzen Kineticore Helmet Black
30% Off Full Price

Lazer

Lazer Cityzen Kineticore Helmet Black

$69.00 Full price
$69.00
Club price
$99.99 Full price
FOX Crossframe Pro MIPS MTB Helmet Matte Black
35% Off Full Price

FOX

FOX Crossframe Pro MIPS MTB Helmet Matte Black

$285.00 Full price
$285.00
Club price
$439.95 Full price
FOX Dropframe Pro MIPS MTB Helmet Matte Black
35% Off Full Price

FOX

FOX Dropframe Pro MIPS MTB Helmet Matte Black

$356.00 Full price
$356.00
Club price
$549.95 Full price
MET Vinci MIPS Road Helmet Black
50% Off Full Price MIPS

Met

MET Vinci MIPS Road Helmet Black MD 56-58cm

$124.00 Full price
$124.00
Club price
$249.95 Full price
Fox Rampage Helmet Mips CE/CPSC Matte Black
29% Off Full Price MIPS

FOX

Fox Rampage Helmet Mips CE/CPSC Matte Black

$339.00 Full price
$339.00
Club price
$479.95 Full price
Giro Fixture MIPS II MTB Helmet Matte Black/Grey UNI 54-61cm
21% Off Full Price

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
Fox Speedframe MIPS Helmet Black
40% Off Full Price MIPS

FOX

Fox Speedframe MIPS Helmet Black

$119.00 Full price
$119.00
Club price
$199.99 Full price
Fox Speedframe Pro MIPS MTB Helmet Matte Black
30% Off Full Price

FOX

Fox Speedframe Pro MIPS MTB Helmet Matte Black

$279.00 Full price
$279.00
Club price
$399.99 Full price
Met Idolo 2 Road Helmet White Glossy XL
50% Off Full Price

Met

Met Idolo 2 Road Helmet White Glossy XL

$84.00 Full price
$84.00
Club price
$169.95 Full price
Giro Source MIPS Helmet Matt Black Fade
50% Off Full Price

Giro

Giro Source MIPS Helmet Matt Black Fade

$119.00 Full price
$119.00
Club price
Met Idolo 2 Road Helmet Black Matt
50% Off Full Price

Met

Met Idolo 2 Road Helmet Black Matt

$84.00 Full price
$84.00
Club price
$169.95 Full price
Giro Fixture MIPS II MTB Helmet UNI Dark Sage
21% Off Full Price

Giro

Giro Fixture MIPS II MTB Helmet UNI Dark Sage

$118.00 Full price
$118.00
Club price
$149.99 Full price
Met Idolo 2 Road Helmet White Glossy UNI
50% Off Full Price

Met

Met Idolo 2 Road Helmet White Glossy UNI

$84.00 Full price
$84.00
Club price
$169.95 Full price
MET Idolo Road Helmet Black
50% Off Full Price

Met

MET Idolo Road Helmet Black

$84.00 Full price
$84.00
Club price
$169.95 Full price
Met Crossover Helmet White Glossy
50% Off Full Price

Met

Met Crossover Helmet White Glossy

$69.00 Full price
$69.00
Club price
$139.95 Full price
Giro Fixture MIPS II MTB Helmet Matte White/Grey UNI 54-61cm
21% Off Full Price

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
Cinettica VELOCITA Helmet Matt Black
6% Off Full Price

Cinettica

Cinettica VELOCITA Helmet Matt Black

$65.00 Full price
$65.00
Club price
$79.99 Full price
Giro Agilis MIPS Helmet Matte White
5% Off Full Price MIPS

Giro

Giro Agilis MIPS Helmet Matte White

$165.00 Full price
$165.00
Club price
$199.99 Full price
Giro Fixture MIPS II Womens MTB Helmet Matte Dark Maroon UNI 50-57cm
21% Off Full Price

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
Giro Fixture MIPS II MTB Helmet Matte Titanium UNI 54-61cm
21% Off Full Price

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 Womens MTB Helmet Matte Black/Stone UNI 50-57cm
21% Off Full Price

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
Jetblack Comp 2.0 Fullface Helmet Black Small

Jetblack

Jetblack Comp 2.0 Fullface Helmet Black Small

$239.00 Full price
$239.00
Club price
$249.99 Full price
Jetblack Pro Fullface MTB Helmet Black

Jetblack

Jetblack Pro Fullface MTB Helmet Black

$319.00 Full price
$319.00
Club price
$329.99 Full price
Giro Fixture MIPS II Womens MTB Helmet Matte Sky Blue UNI 50-57cm
21% Off Full Price

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
FOX Proframe MIPS Fullface MTB Helmet Matte Black
27% Off Full Price

FOX

FOX Proframe MIPS Fullface MTB Helmet Matte Black

$399.00 Full price
$399.00
Club price
$549.95 Full price
Lazer Lupo Kineticore MTB Helmet Matte Black UNI 55-61cm
21% Off Full Price

Lazer

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

$118.00 Full price
$118.00
Club price
$149.99 Full price
Giro Agilis MIPS Road Helmet Matt Black

Giro

Giro Agilis MIPS Road Helmet Matt Black

$165.00 Full price
$165.00
Club price
$199.00 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
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Inseam: --
Adjusted Height: --

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Recommended sizes will now be highlighted on the page.

Shop 99 Bikes Extensive Range of Adults Bicycle Helmets for top-quality protection for every type of riding. Featuring a wide range of options, from Casual Sport and Leisure Helmets for everyday comfort to Road Helmets crafted for speed and aerodynamics. For trail enthusiasts, our MTB Helmets and Full Face Helmets offer extra coverage and durability, while Commuter Helmets prioritize visibility and style on urban streets. BMX riders can find high-performance BMX Helmets designed for tricks and stunts. With options to suit every riding style, 99 Bikes has the perfect helmet to keep you safe on all your adventures. Shop in-store and online now with 99 Bikes.
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FREE SHIPPING OVER $149*

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