After having installed/ridden/raced scores of every incarnation of Dura Ace chain over nearly 20 years without a single failure, I read the installation instructions closely for the first time. I've been installing the chains, specifically the connecting pins, correctly (from outer side, using reinforced connecting pin in new 7801, etc.), with one big exception, to wit: I haven't ever paid attention to whether I install the pin in the front or back of the link.
So, I was surprised to learn that in their installation directions Shimano states, "we strongly recommend to set the connecting pin in the hole of the outer link on the front side in the direction of travel
. The chain's level of strength is [thereby] enhanced..." Here's a link to the Shimano pictorial chain installation directions, with the above recommendation: http://bike.shimano.com/media/techdocs/ ... 612411.pdf
Is this something most of you are aware of that I somehow never read, heard, etc.? I looked at my bikes and all happen to be installed this way except for my primary race bike that I ride most.
I'm not concerned the chain'll snap and I'll die, but I'm curious how much extra strength is gained by using the front link hole? Can any of you engineer/physics types explain this in lay terminology?