That's right bub, o-ring, x-ring & w-ring. Make sure to adjust the chain after a few hundred miles. It'll loosen up and stretch a little.hey man! im new to this forum so bare with me haha. i just got a 520 conversion done yesterday and let me tell you.... its amazing and amazing smooth! so what i did was go with SUNSTAR sprockets. I dropped a tooth in front (15t) and stayed with the same amount of teeth in the rear (45t). The guy i went to gave me much needed info and tried to help me out, so that was an advantage. He recommended a 525 o-ring chain since the conversion may eat up the 520 chain rather quickly. But, i guess the sunstar sprockets needed a 520 chain. So we went with a D.I.D x-ring 520 chain. If you do not know, there are 0-ring, x-ring, and i believe y-ring? chains. Well the o-ring chain is the cheapest and has less cushioning/padding so it will tear up the chain faster. Then its the x-ring chain and that chain is suppose to last longer and it is several bucks more. well, overall i am content with the outcome of the finishing adjustments! I believe i do not need a speedhealer but i can tell the difference. My mph is about 5-10 mph faster but that is ok. Let me know if you have any questions!