Originally Posted by
Kontact
I see. Well, you're wrong. A constant spring rate means each new additional distance of compression requires the same new added amount of force. But that's on top of the force already applied. So the first inch is 1 pound of force. So is the second inch, but that's on top of the first inch's 1 pound, so we're now at 2 pounds.
Yes, but in the RD context you have already applied the first unit of force to move the first distance in the first shift.
Originally Posted by
Kontact
Rear derailleurs have the least spring force near the high stop and the most approaching the low stop. If you actually pick up and touch a derailleur this becomes pretty obvious.
That is because the geometry of the RD parallelogram. Each shift to the next larger cog involves a distance that is slightly greater than the previous shift.