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Fit Tool

Helmet Fit Guide

Measure head size, run the four basic fit checks, and see whether your helmet is ready to ride, needs adjustment, or should be replaced.

Size, use, fit checks

Check helmet fit

9 of 9 helmet inputs set
Measure around the widest part of the head, about an inch above the eyebrows.
Fit checks
Helmet sits level and low
Side straps make a V under each ear
Chin strap is snug
Helmet does not shift more than about an inch

Helmet Fit Verdict

Fit looks ride-ready

58cm head · Adult · Commuting

Start with sizeMedium adult helmet
Head range55-59cm
Fit checks passing4 of 4
Replace now?Not based on age/history

What to do next

  • Start with 55-59cm, then confirm the exact brand size chart before buying.
  • The basic fit checks pass. Re-check after adjusting hair, hats, liners, or lights.
  • If the helmet is newer and crash-free, fit and certification are the main checks.
  • Prioritize CPSC certification, comfort, and visibility features for everyday commuting.

Helmet matches to compare

These are live helmet products that look compatible with the size and riding use you entered. Confirm the seller’s current size chart before buying.

Visibility-focused commuter option

Road
ROCKBROS Ultralight Aerodynamic Helmet, MTB/Road
Fit
CPSC
ROCKBROS

ROCKBROS Ultralight Aerodynamic Helmet, MTB/Road

$62.99
MTB & Road, Weight-Conscious Riders
Use: Road

A ~300g aerodynamic helmet for MTB and road riding, with reflective elements for low-light visibility.

View Deal Details

Visibility-focused commuter option

Road
ROCKBROS Road Aero Helmet for TT & Triathlon
Fit
CPSC
ROCKBROS

ROCKBROS Road Aero Helmet for TT & Triathlon

$66.99
Time Trial & Triathlon
Use: Road

A teardrop-shaped aero helmet built for time trial and triathlon riding, claiming 40%+ less air resistance.

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Visibility-focused commuter option

Everyday
MC Bike Protective Helmet with LED Light
Fit
CPSC
mooncool

MC Bike Protective Helmet with LED Light

$69.99
Visibility-Focused Everyday Helmet
Use: Everyday

A lightweight helmet with a built-in rear LED light and an adjustable interior fit.

View Deal Details

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