Always the same questions and same answers. I detailed my reasons for staying with 630 chain in another thread on this subject and haven't changed my mind yet. I stayed with 630 because it kept things simple for me. Is durability better with 530 chain? I don't know for sure on that one, because the only way to find out is to run a real world test on two identical bikes with one equipped with 530 chain and the other with 630 chain riding each in a similar fashion over an extended period of time.
Now let's talk about the best oil......
Rick H.
Save your self the time Rick and just look at the HP ratings of the bikes using the smaller chains, some of them are on their way to 3 times as much power as our bikes . It's NOT a chicken or egg scenario, its simple metallurgy mate, Modern chains are made from better materials, have better lubricating
characteristics, are definitely lighter and just make more sense, There's no problem changing them either, if you can change a 630 you can change any chain, you can by direct conversions from a number of places so it's a no brainer. It has nothing to do with the "best oil" argument. As Nessism said, the 630 is virtually obsolete on modern bikes, there's a simple reason for that.....