My chain breaker wouldn't touch this chain, I had to grind the rivet heads off to get it to length. The pinheads were peaned over one hell of a lot, the breaker pushed them out fine after the grinder did its thing. This was there lower strength 530 O ring, or was supposed to be as they sent there X ring. I have there top of the range chromed 530 O ring on my 3C. The Pantah one takes 120hp so its fine, the top rated one will take Bussa power so its fine on the 3C.