Quote Originally Posted by CorsairMac
I have thumb - or rapid-fire shifters - on 2 of my bikes and I had to move the shifters. I had problems with my thumbs too and I realized it was coz I was pushing very hard and way out to shift, I was actualy pivoting my hand on the grips to shift. I just moved the shifters in closer to my hand and pivoted them so they sit a little higher. Now my thumbs don't have to reach so far to shift and that has resolved my problem.
This is certianly something I will look into as I do move my hand down in order to have my thumb reach the levers. In the short term I may have to remember to adjust how I reach the lever, perhaps that will ease the pain. Thanks!