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Bell Bike Helmet Size Guide

Your Bell Bike Helmet is an essential piece of safety equipment. A poor fitting helmet can be both uncomfortable and more importantly, may be less effective in the event of an accident. It is essential that your helmet fits comfortably and securely. To ensure you have the correct fitting helmet that is able to perform at it's highest capabilities we have created a guide on how to find your head size, and a comprehensive list of the sizings of each of our helmets.

How to find your head size

Wrap a soft measuring tape around your head, keeping it level from front to back. Note the measurement and use the size charts as a guide.

Note: Make sure the helmet fits snuggly, but not uncomfortably so, and sits low enough to protect the forehead without hindering your vision. Once you've got the right size, you can adjust the fit.

4Forty
MODEL(S): 4FORTY

HELMET

SIZECMINHAT SIZE (IN)
S52–5620 1/2–226 1/2–7M55–5921 5/8–23 1/46 7/8–7 3/8L58–6222 3/4–24 3/87 1/4–7 3/4XL61–6524–25 5/87 5/8– 8 1/8
Avenue
MODEL(S): AVENUE

HELMET

SIZECMINHAT SIZE (IN)
Universal Adult54–6120 1/4–246 3/4–7 5/8Universal Women’s50–5719 5/8–22 1/26 1/4–7 1/8Universal XL58–6322 7/8–24 7/87 1/4–7 7/8
Formula
MODEL(S): FORMULA

HELMET

SIZECMINHAT SIZE (IN)
S52–5620 1/2–226 1/2–7M55–5921 5/8–23 1/46 7/8–7 3/8L58–6222 7/8–22 7/87 1/4–7 3/4
Full-9
MODEL(S): FULL–9

HELMET

SIZECMINHAT SIZE (IN)
XS/S51–5320 1/8–20 7/86 3/8–6 5/8M55–5721 5/8–22 1/26 7/8–7 1/8L57–5922 1/2–23 1/47 1/8–7 3/8XL/XXL59–6323 1/4–24 7/87 3/8–7 7/8
Full-9 Fusion
MODEL(S): FULL–9 FUSION

HELMET

SIZECMINHAT SIZE (IN)
XS51–5320–20 7/86 3/8–6 5/8S53–5520 7/8–21 5/86 5/8–7M55–5721 5/8–22 3/87–7 1/8L57–5922 3/8–23 1/47 1/8–7 1/2XL59–6123 1/4–247 1/2–7 5/8XXL61–6324–24 3/47 5/8–7 7/8
Lil Ripper
MODEL(S): LIL RIPPER

HELMET

SIZECMINHAT SIZE (IN)
Universal Toddler45–5217 3/4–20 1/25 5/8–6 1/2Universal Child48–5518 7/8–21 5/86–6 7/8
Local
MODEL(S): LOCAL

HELMET

SIZECMINHAT SIZE (IN)
S51–5520 1/8–21 5/86 3/8–6 7/8M55–5921 5/8– 23 1/46 7/8–7 3/8L59–61.523 1/4–24 1/47 3/8–7 3/4
Racket
MODEL(S): RACKET

HELMET

SIZECMINHAT SIZE (IN)
S51–5520 1/8–21 5/86 3/8–6 7/8M55–5921 5/8– 23 1/46 7/8–7 3/8L59–61.523 1/4–24 1/47 3/8–7 3/4
Sanction
MODEL(S): SANCTION

HELMET

SIZECMINHAT SIZE (IN)
XS48–5118 7/8–20 1/86–6 3/8S52–5420 1/2–21 1/46 1/2–6 3/4M55–5721 5/8–22 1/26 7/8–7 1/8L58–6023 1/4–23 5/87 3/8–7 1/2
Sidetrack
MODEL(S): SIDETRACK

HELMET

SIZECMINHAT SIZE (IN)
Universal Child47–5418 1/2–21 1/45 7/8–6 3/4Universal Youth50–5719 5/8–22 1/26 1/4–7 1/8
Sidetrack II
MODEL(S): SIDETRACK II

HELMET

SIZECMINHAT SIZE (IN)
Universal Toddler45–5217 3/4–20 1/25 5/8–6 1/2Universal Child47–5418 1/2–21 1/45 7/8–6 3/4Universal Youth50–5719 5/8–22 1/26 1/4–7 1/8
Sixer
MODEL(S): SIXER

HELMET

SIZECMINHAT SIZE (IN)
S52–5620 1/2–226 1/2–7M55–5921 5/8–23 1/46 7/8–7 3/8L58–6222 3/4–24 3/87 1/4–7 3/4XL61–6524–25 5/87 5/8– 8 1/8
Span
MODEL(S): SPAN

HELMET

SIZECMINHAT SIZE (IN)
XS49–5319 1/4–20 7/86 1/8–6 5/8S51–5520 1/8–21 5/86 3/8–6 7/8
Spark
MODEL(S): SPARK, SPARK W, SPARK JR

HELMET

SIZECMINHAT SIZE (IN)
Universal Adult53–6020 7/8–23 5/86 5/8–7 1/2Universal XL58–63 (Select Colors)22 7/8–24 7/87 1/4–7 7/8Universal Women’s50–5719 5/8–22 1/26 1/4–7 1/8Universal Youth52–5720 1/2–22 1/26 1/2–7 1/8
Stratus
MODEL(S): STRATUS

HELMET

SIZECMINHAT SIZE (IN)
S52–5620 1/2–226 1/2–7M55–5921 5/8–23 1/46 7/8–7 3/8L58–6222 7/8–22 7/87 1/4–7 3/4
Super 3R
MODEL(S): SUPER 3R

HELMET

SIZECMINHAT SIZE (IN)
S52–5620 1/2–226 1/2–7M55–5921 5/8–23 1/46 7/8–7 3/8L58–6222 3/4–24 3/87 1/4–7 3/4
Super Air/Super Air R
MODEL(S): SUPER AIR, SUPER AIR–R

HELMET

SIZECMINHAT SIZE (IN)
S52–5620 1/2–226 1/2–7M55–5921 5/8–23 1/46 7/8–7 3/8L58–6222 3/4–24 3/87 1/4–7 3/4
Super DH
MODEL(S): SUPER DH

HELMET

SIZECMINHAT SIZE (IN)
S52–5620 1/2–226 1/2–7M55–5921 5/8–23 1/46 7/8–7 3/8L58–6222 3/4–24 3/87 1/4–7 3/4
Trace
MODEL(S): TRACE

HELMET

SIZECMINHAT SIZE (IN)
Universal Adult54–6120 1/4–246 3/4–7 5/8Universal Women’s50–5719 5/8–22 1/26 1/4–7 1/8Universal XL58–6322 7/8–24 7/87 1/4–7 7/8
Transfer
MODEL(S): TRANSFER

HELMET

SIZECMINHAT SIZE (IN)
XS51–5320–20 7/86 3/8– 6 5/8S53–5520 7/8–21 5/86 5/8–7M55–5721 5/8–22 3/87–7 1/8L57–5922 3/8–23 1/47 1/8–7 1/2XL59–6123 1/4–247 1/2–7 5/8XXL61–6324–24 3/47 5/8–7 7/8
Traverse
MODEL(S): TRAVERSE

HELMET

SIZECMINHAT SIZE (IN)
Universal Adult54–6120 1/4–246 3/4–7 5/8Universal XL58–6322 7/8–24 7/87 1/4–7 7/8
Z20/Z20 Aero
MODEL(S): Z20, Z20 AERO

HELMET

SIZECMINHAT SIZE (IN)
S52–5620 1/2–226 1/2–7M55–5921 5/8–23 1/46 7/8–7 3/8L58–6222 7/8–22 7/87 1/4–7 3/4
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