The Era ring is made of three parts, letting us use the best-performing material for each. For the teeth, that’s stainless steel, which is stronger (and harder) than titanium with a wear life five times that of aluminum.

Binding it all together is the carbon fiber spider, compressed and co-molded using the same process we developed for Era carbon cranks. This little spider can withstand the torque of a 5.9L Cummins diesel engine. We checked.