Calliper updates
Meanwhile, Hope's four-piston E4 and V4 callipers have been updated to house hybrid pistons, made of stainless steel with a phenolic insert, rather than being entirely made of phenolic resin (a much softer material). According to Hope, this "allows for smoother movement and less maintenance, while still being able to manage high temperatures without heat transfer during extreme use." For what it's worth, the
SRAM Guide Ultimate used metallic pistons, and in my experience, they were far smoother and more consistent than the standard Guide RSC of the time.