Apologies for a mundane topic. I need to order a new chain and sprocket set so had a look on B&C website and wish i hadnt! First off they dont list NSR's but im sure they supply them but how many different chains do they stock!!

So i was wondering what folks on here recommend for road use? Tsubaki alpha/omega/sigma
Renthal R3/R4
DID
I was planning on getting O ring.

On the sprocket front i was going to get 15 front 42 rear hard anodised renthal, anyone see a problem with this ratio and anyone any idea how long a chain i will need to order.

Thanks in advance,
Andy.