ST5 FN Zero Ultra Racing Helmet (57 CM Medium) - FIA 8860-2018 SA2020 1.6L Power steering pulley is 8%

Power steering pulley is 8% OD

Precision laser cut aluminum plate and bent

no logic programming required for PDU operation

has the seam on the outside for improved comfort and a better feel on the wheel

ST5 FN Zero Ultra Racing Helmet (57 CM Medium) - FIA 8860-2018 SA2020 1.6L Power steering pulley is 8%Stilo has two separate shell sizes for this helmet. This allows us to make a better fitting helmet that is lighter weight. Instead of filling a very large shell with lots of padding for a size small, we have one shell size for x small to medium, and one for large and x large. Snell SA2015 vs 2020 what's changed? The Snell SA2020 testing requirements have changed a small amount and have now become more in line with the FIA 8859 Helmet Standard.