O-ring chain uses O-rings with an O cross-section. X-ring chain uses O-rings with an X cross-section. X is supposed to be superior. I use D.I.D. X-ring chains so they must be good.

 

I had an X ring on my KLR for awhile.

It was distressing to watch the little X legs fall off upon inspection and lube maint. Well, till I thought they was all gone and I went back to O ring chains.

I clean my chains with kerosene.

 

D.I.D’s PATENTED X-Ring construction reduces friction by twisting between the side plates instead of being squashed. Normal O-Rings and other makers’ modified O-Rings have squashed points that increase friction. The twisting action of the X-Ring disperses the pressure and minimizes power loss.

The X-Ring’s four contact points greatly increase its sealing performance. This keeps the dirt out and the lubrication in much better than any other O-Ring. X-Rings have the greatest wear resistance of any other type of O-Ring or Non-O-Ring chain.

See diagrams: D.I.D. X-RING STREET CHAINS

O Ring and X Ring Chains ¦ Motorcycle Chains ¦ Technical Help ¦ Bike Torque Racing

 

Yeah, the X-ring is just a DID-patented thing. It's pretty much the same idea, marketed with the advantages invader listed above.

I like DID chains, I've also had good experiences with RK chains.

X or O, the idea is that they have a seal keeping in lubricant. Much longer lasting than a non-O ring chain, which I'd never use. Maybe on a dirtbike....