My bike is setup almost entirely with a shimano 105 10spd group. This bike is used mainly in fair weather - I can count the times I've road it when raining.
I'm finding I can only get 2000-3000 miles from an Ultegra 10 speed chain (CN-6600?) before it "stretches". My commuter bike has an 8 spd SRAM chain and I can ride through wet Seattle winters and the filthy thing seems to last 5000 before it "stretches".
Ignoring the weight penalty, is there any thought that a 105 chain would be more durable than the ultegra? Or perhaps is the Dura Ace both lighter and stronger?
In the past I've experimented with non-shimano chains, but with shimano rings keeping it all the same does appear smoother - at least quieter.