I've been using the new Comp composite gear, its a plastic polymer and it holds up a hell of a lot longer than bronze and they make them to fit either a large or smaller shaft od. I have a roller cam and I wasn't supposed to have to switch, but I noticed some wear starting on my cam gear so I swapped it out with the new composite one. Works great and it doesn't wear out, if you want to be SURE, you might wanna try this one out, it definately won't wear out your cam nor will it break down. They use em on dragsters and high hp engines, so I'm pretty sure they are reliable.