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Helmet Size Guide

Words by Harry Archer

on 13/03/2018 13:43:35

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Our helmet size guides below show you how to measure your head properly, to get the best fit.

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How do I choose the right size?

1. Measure your head with a tape measure

Top tips: Ask a friend to help – it tends to improve accuracy. Keep the tape measure snug but not tight.

Helmet

Measure around the centre of your forehead just above your ears, crossing the bumpy bone at the back of your head (occipital bone).

2. Find your size, using the tables below

Remember, all sizing information is a guide only. If you have any questions about bike sizing, our expert team is here to help. Call us on 0330 555 0080, use our Live Chat, or email us.


Helmets – Size Charts

See below for specific sizing charts for Specialized, Kask, Met and Giant

Specialized Helmet Size Charts

Adult 3-Size

Helmet Size Cir. (in) Cir. (cm)
Small 20"-22" 51-56cm
Medium 21.75"-23.25" 55-59cm
Large 23.25"-24.75" 59-63cm

Universal Adult Sizing

Model Cir. (in) Cir. (cm)
Max 22"-25.25" 56-64cm
Align 21.25"-24.5" 54-62cm
Chamonix 21.25"-24.5" 54-62cm
Centro 21.25"-24.5" 54-62cm
Sierra 19.75"-23" 50-58cm
Duet 19.75"-23" 50-58cm

Ambush

Helmet Size Cir. (in) Cir. (cm)
Small 20"-22" 51-56cm
Medium 21.25"-23" 54-58cm
Large 22.5"-24" 57-61cm
X Large 23.25"-24.75" 59-63cm

Adult MIPS 3 Size

Helmet Size Cir. (in) Cir. (cm)
Small 20"-22" 51-56cm
Medium 21.25"-23.5" 54-59cm
Large 22.5"-24.75" 57-63cm

Universal MIPS Adult Sizing

Model Cir. (in) Cir. (cm)
Chamonix 21.25"-23.5" 54-59cm
Duet 19.75"-23" 50-58cm

Covert

Helmet Size Cir. (in) Cir. (cm)
X Small 18.5"-20.75" 47-53cm
Small 20.5"-22" 52-56cm
Medium 22"-23.5" 56-60cm
Large 23.5"-24.75" 60-63cm

S-Works TT

Helmet Size Cir. (in) Cir. (cm)
X Small/Small 20"-22.5" 51-57cm
Medium/Large 21.25"-23.5" 54-60cm

Dissident/Dissient Comp

Helmet Size Cir. (in) Cir. (cm)
Small 21.25"-21.75" 54-55cm
Medium 22"-22.5" 56-57cm
Large 22.5"-23.25" 58-59cm
X Large 23.5"-24.25" 60-62cm

Universal Fit Youth Sizing

Model Cir. (in) Cir. (cm)
Mio 17.5"-20" 46-51cm
Shuffle Child 19.75"-21.75" 50-55cm
Shuffle Youth 20.5"-22.5" 52-57cm
Flash 19.75"-23" 50-58cm

Small Fry

Helmet Size Cir. (in) Cir. (cm)
Toddler 17.5"-20.5" 44-52cm
Child 18.5"-21.75" 47-55cm

Kask Helmet Size Charts

Infinity / Rex / Rapido

Helmet Size Cir. (in) Cir. (cm)
Medium 20.5"-22.75" 52-58cm
Large 23.25"-24.5" 59-62cm

Protone / Valegro

Helmet Size Cir. (in) Cir. (cm)
Small 19.75"-23.1" 50-56cm
Medium 20.5"-22.75" 52-58cm
Large 23.25"-24.5"" 59-62cm

Bambino Pro / Mistral

Helmet Size Cir. (in) Cir. (cm)
Medium 21.75"-22.75" 55-58cm
Large 23.25"-24.5" 59-62cm

Mojito

Helmet Size Cir. (in) Cir. (cm)
Small 18.25"-22.1" 48-56cm
Medium 18.75"-22.75" 52-58cm
Large 23.25"-24.5"" 59-62cm
X Large 23.75"-25.25" 63-64cm

Met Helmet Size Charts

MET Child Universal

Model Cir. (in) Cir. (cm)
Crackerjack 20.5"-22.5" 52-57cm
Elfo 18.25"-20.75" 46-53cm
Genio 20.5"-22.5" 52-57cm

Giant Helmet Size Charts

Adult Helmet Sizes

Helmet Size Cir. (in) Cir. (cm)
Small 20.25"-21.75" 51-55cm
Medium 21.75"-23.25" 55-59cm
Large 23.25"-24.75" 59-63cm

Prompt

Helmet Size Cir. (in) Cir. (cm)
Small/Medium 19.25"-22.5" 49-57cm
Medium/Large 20.75"-24" 53-61cm

Holler Kids

Helmet Size Cir. (in) Cir. (cm)
One Size 18.25"-20.25" 46-51cm

Hoot Kids

Helmet Size Cir. (in) Cir. (cm)
One Size 19.75"-21.75" 50-55cm