taniwha said:
How is that so? Does the groupset shudder to pieces after 400metres of incline? Does it matter how steep that incline is?
I'm sorry to say, but a 400 meter (long) incline is merely a bump in the road ...
As far as the groupset shuddering to pieces, of course not ...
Depending on the incline, you may find that the chain does not engage the next sprocket over as smoothly/quickly when you are down shifting as it does if you are on the Flats when you use Shimano's currently available STI shifters.
The chain will not make any noise if the transition between cogs is smooth ... if you are hearing
any noise from the chain when moving to a larger cog OR there is any momentary hesitation (which may manifest itself as chain noise), then THAT is what 'I' am talking about when I refer to the Shimano shifters balking at times.
N.B. According to those who have marveled after using the Shimano Di2, the shifting has been described as precise, quick, smooth, etc. -- a description which is applicable to the Campagnolo shifters (and, supposedly, the SRAM rear shifter) ...
Would there be anything for those who have waxed eloquently about the Di2 (in other threads this Forum & by so-called "professional" reviewers) if the mechanical Shimano STI shifters were equally capable?
Would there be any reason for a Shimano
aficionado to pay a significant premium for a Di2 drivetrain other than conspicuous consumption if the current, mechanical Shimano shifters were equally capable?
Think about it.