Bell Custom 500 Chassis HelmetBell Custom 500 Chassis Helmet Inspired by Bells very first production helmet in 1954, the Custom 500 is newly refined with an oval design and low profile fit, giving it that smaller look you want with the same throwback style. Core Since 54 The Custom 500 is the epitome of a classic 3 4 helmet. With 5 shell sizes, this helmet is sure to give the rider a personalized fit regardless of where you are on the size chart, and is lightweight with a padded