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I went over my 'does fit change with fatigue on multi-day events?' questions with Scherrit yesterday. For interest, these were the main points:
He reckoned that it was common for Grand Tour riders to put their saddle down by 3mm or so after the first two or three days as things tightened up - so the same would apply on an ultra.
If I am sitting back more after a couple of days the best adjustment would be to put the saddle nose down by a degree. That should help re-establish the right pelvic tilt so that the bar distance feels right again. Changing to a shorter stem would be too radical - would either mean that I had started with completely the wrong fit or had had a collapse in core muscles.
The Steve Hogg posts are excellent, I've used them a bit but good to re-read. In his language what I'm getting at is that my (and everyone else's) balance point changes. While I'm putting out enough power to hold my torso up on day one, by day 3 or 4, I'm not, and so more weight goes onto my arms by default. So - from a functional, rather than anatomical, point of view I think my fit should change. Shame Steve is not able to answer questions any more!
In TCR 2019 I found that made riding on the hoods painful. I tried to adjust by putting the seat back but that made the reach too long. I was on the aerobars virtually all the time - even on the first bit of the off-road climb up to the radio station - as it was the only comfortable position, but hadn't done any core strength work (I have now), and got Shermer's.
I hope that the core stuff has put me in a better place for long days in the aerobars, but I'll want to use the hoods a bit, so trying to anticipate the issues that might arise.
Anyway, the answer to my question is pretty clear - no-one else is feeling the need to adjust mid-race so thanks guys.