Hope stealth race e4 evo disc brake rotorrace evo lever matched with our e4 caliper offers an all round race light package hope technology is one of the world leaders in engineering bicycle components since 1989 hope has been pushing the industry forward through designing testing and manufacturing virtually all products in house features a mix of ten titanium and two aluminium bolts helps keep the brake weight light rigid cncd one piece caliper e4 caliper has 4x16mm phenolic pistons to