I just changed out my Ironman 49 tooth sprocket to a 50 tooth Twinring sprocket about 2 rides ago. Chain is a DID 520VM with no noticeable stretch(has about 25 hrs on it). I did not replace the chain at this time because there was no stretch from the chain. My Twinring sprocket looks horrible after around 2 hours and 2 rides on it. The chain has worn grooves into the steel part and the back sides of the teeth are starting to push outward. Sort of like peening. Everything is aligned. I find it hard to believe that it can be this bad this quickly. It is wearing worse than a cheap aluminum sprocket. My ironman sprocket showed no noticeable wear and it has been on there for about 25 hours. Bike has 27.6 hrs on it. Stock chain and sprockets were replaced right after break in. Opinions?