Originally Posted by
StanSeven
It's likely an adjustment thing but you made too much of an adjustment all at once. Most of the advice I read is only make seatpost adjustments in 1 cm increments until you get used to it and the same with saddle position.
+++1 !
if you're set on getting to the 'new' position, I would make the change in increments, 1 cm for height is a bunch, and certainly for fore/aft 5 mm is a lot.
I'd go back and make the changes in 1/4rs or 1/3ds over a period of 5-6 rides per change. Give the body a chance to adapt without overdue strain.
Means way less chance of causing both muscle and connective tissue injury... which might take months to heal.
changes you make in seat will have large reprocussions all the way up and out thru the body
hamstrings, especially can cause naggin injuries for very long periods of time.
or
you can take your chances...