if you want it to last get a sidewinder sprocket.i forget the name of the one i had but, i had it on my harescramble machine. two years and i dont even think it was starting to wear. but i use sunstars and a did ERT chain. on the 450 i have a parts unlimited x-rings and they last great, not to mention they are lik 60 bucks or so retail and wear awesome. the only thing with the is they arent gold plated, but who cares.