
Originally Posted by
Blueberry
My theory was that it's the extended periods of sitting completely upright (which would rotate the pelvis backwards in a way that doesn't happen on the road) - as opposed to my normal angle. I'm inclined to play it by ear and see what happens - I hate to start from scratch saddle shopping when these have worked for so long.
This isn't a bad theory. The way to test it would be to not sit up for a trainer workout 9or 3) and see if your symptoms abate. A too narrow saddle is a more significant problem on a trainer because you don't shift your weight around the same way you do when riding outside so the adverse pressures are more constant. Sitting upright also puts more weight on your pelvis and will accentuate any problems from riding a too narrow saddle as well as potentially putting too much pressure on your tailbone.
Also, the Terry Butterfly is a cut away and they break down in the middle where the cut away is. It doesn't take that long for this to happen. When it does you slid forward onto the narrower part of the saddle (especially when sitting upright) and then you've got a narrow saddle issue, even if it's the right saddle for you.
I would try staying on your bars more and concentrating on keeping your sitbones back on the widest part of the saddle. You could also try tipping the saddle nose up just a little to help slide you back there.
Living life like there's no tomorrow.
http://gorgebikefitter.com/
2007 Look Dura Ace
2010 Custom Tonic cross with discs, SRAM
2012 Moots YBB 2 x 10 Shimano XTR
2014 Soma B-Side SS