Troy Lee Designs D4 Composite Helmet w/Mips - Drip ltp To adjust psi on the

To adjust psi on the fly simply open the valve slightly to release air to your desired pressure

Each spring is optimized by using a smaller wire diameter and fewer coils

It is compatible with both 10 and 11-speed freehubs

The Universal Derailleur Hanger (UDH™) consolidates thousands of mountain bike derailleur standards

Troy Lee Designs D4 Composite Helmet w/Mips - Drip ltp To adjust psi on theAlways Evolving. Built with an aerospace shell design and materials, we were able to get the D4 Composite helmet to 1050 grams without sacrificing any strength. Mips C2 protection system is used to add an additional layer of safety in the event of a fall. For comfort, the D4 Composite routes cooling air through a front air intake system that flows through the polymer center and power grid side mesh keeping your head cooler during the ride. X static