Originally Posted by
alexdi
I can't explain it any better than I have. This isn't a hypothetical; I can video the difference, or you can just walk into the garage with a screwdriver and find out yourself.
I'm not getting. In part, because some of the things you say aren't true:
The reason for it, again, is that the chain doesn't reach full tension for a given sprocket until after the shift is completed.
The chain is under more tension before the shift is completed, if you're talking about rear derailleur tension. This is because the chain is riding a larger diameter before it settles into the new sprocket. Once it settles, then the new total chain wrap decreases.
I've worked as a shop mechanic for years and have adjusted a lot of B screws. What is it I'm supposed to be looking for when I pick up a screwdriver for the millionth time?