Which chain acually has less friction?

 

X-ring chains have less friction.....they are basically an O-ring chain with little channels grooved into the o-ring.....let the o-ring twist & relax a little more than a standard o-ring. My experience has shown that an X-ring lasts a little longer than o-ring chain...I've had some o-ring fall out after time...never had that prob with an X-ring. Buy a D.I.D X-ring..they are costly..but you get what you pay for.

 

The x-ring is likely the last chain you will buy. They last a long time and don't stretch too much. The x-ring also holds lube better than the o-ring and creates less friction. Great buy!