hey there dr.plasma.
first read this thread about shifting under load, then take two asprin and call...just kidding, start here and see if this helps.
It sounds like you're shifting under load, you can shift under the stresses of climbing but it takes skill and practice and ..... tips from TE...start here:
http://forums.teamestrogen.com/showthread.php?t=2868&highlight=shifting+load[/url]



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