X ring or O ring?

Since the difference is £20, personally I'd go the DID. It may be false peace of mind but it's still peace of mind.
 
Never buy cheap spec/unbranded chains, they won't last the distance especially on something with a bit of power. Imagine how much damage a broken chain could do to you and your bike.

Stick with DID, Regina, EK, Tsubaki etc. Those cheapies will probably be "Donghua" or some other poor quality Chinese brand.
 
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