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Bike Helmet Size Chart

A properly fitting helmet is important for safety and comfort while riding a bicycle.  

Step 1.  Measure your head.

Nutcase Bike Helmet Measurement Image

Measure the circumference of your head with a tape measure. Place the tape measure slightly above the ear and bring it across the mid forehead completely circling the head about 1 inch above the eyebrows. Take several measurements to make sure you have the largest size. If you do not have a tape measure, use a string and measure it against a ruler. 


Step 2. Choose your helmet.  The chart below shows which helmets fit for each head size.  

 

45cm

46cm

47cm

48cm

49cm

50cm

51cm

52cm

53cm

54cm

55cm

56cm

57cm

58cm

59cm

60cm

61cm

62cm

63cm

64cm

Giro Scamp Helmets Size X-Small

45-49cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bell Lil Ripper Helmets Size Toddler

45-52cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lazer Lil Gekko and Lil Gekko MIPS Helmets

46-50cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nutcase Baby Nutty Helmet

47-50cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bell Sidetrack II MIPS Helmets Size Child

47-54cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bell Sanction Full Face Helmet Size X-Small

48-51cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nutcase Little Nutty Helmet

48-52cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bell Lil Ripper Helmet Size Child

48-55cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Giro Scamp Helmets Size Small

49-53cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lazer Gekko and Gekko MIPS Helmets

50-56cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Giro Tremor MIPS Helmets

50-57cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bell Sidetrack II MIPS Helmets Size Youth

50-57cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Giro Hale MIPS Helmets

50-57cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bell Sanction Full Face Helmet Size Small

52-54cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lazer J1 Junior Helmet

52-56cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nutcase Adult Small Helmet

52-56cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lazer Adult Small Helmet

52-56cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bell Sanction Full Face Helmet Size Medium

55-57cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lazer Adult Medium Helmet

55-60cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nutcase Adult Medium Helmet

56-60cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Bell Sanction Full Face Helmet Size Large

58-60cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lazer Adult Large Helmet

58-62cm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nutcase Adult Large Helmet

60-64cm