Are Giro Bike Helmets Good?
Are Giro Bike Helmets Good? Helmet Size Head Size Giro Helmet Bell Helmet Small (S) 51-55cm (20.0”-21.75”) 52-56cm (20.5”-22.0”) How long are Giro helmets good for? We recommend that helmets should be replaced every 3-5 years to ensure you have the full protective benefit of a quality helmet, as well as a helmet with the