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I did think about both the Tarmac and the Shiv for TABR but dismissed both.
Tarmac is not Di2 or disc and I like my Di2 and discs. No hand fatigue.
Shiv brakes are shit and just didn't have enough space for my stuff.Yeah - a TT bike would need to be thought about and adapted specially, like Ultan did with his custom luggage. Lack of attachment points / braze-ons would be a handicap.
I had an old CAnnondale Slice which was too big for me for TTs but it was really comfortable. Position wasn't very extreme aero but not bad. I used it quite a bit for audax. It would have been feasible for an ultra, but my current one wouldn't really, without completely re-jigging stuff
Agree - there is a lot of herd thinking, some sponsored riders and lots of people get the same kit to show group affiliation. TBH I've never really seen the point of Ti frames for anything much. But if people like them it is up to them, of course.
A TT bike would make sense for IndyPac if you could get the position ok for extended use. Christoph Strasser used one when he went across the nullarbor last year.
I didn't use mine as I've not been comfortable on it for a while and tyre clearance and carrying enough luggage + water were issues. I did use the wheels off my TT bike, though
For TCR there is more rough surface and more climbing and descending so less benefit. DK about TABR, I'd have thought all the windy plains would favour it.