Anyone run them? I've seen mostly, if not all, using ones that don't have it. My bike is street legal, so it gets alot of street time and chain stretching. While the chain really doesn't stretch greatly, I'm retrofitting a Z50 rear wheel on the bike and considering a O-ring chain since I ride it on the streets...

Any opinions?

 

Do they even make o ring 420 chains? Ive never seen one.

 

Yep they do, I did a 420 conversion on my old SV650. Same principle, lighting sprocket and chain = more power but I'm only doing this for servicing chain and lasting longer.

 

WHo makes it?

 

RK and several other brands... Here's first link in google which was RK

http://www.bikebandit.com/rk-420-so-...d-o-ring-chain