The only Foil that would have any chance of being used for a better TT setup, but still be used as a road bike is the 52cm/49cm.
I sold my 56cm because it was too large, and I ran a no-offset post. I switched to a 54cm, and really, there isn't too much difference between the 54-56cm in reality.
The only frame then would be a drop down to a 52cm, where the HT/angles are different that would lend itself to a more aggressive setup forward/aero.
Matt Goss supposedly rides a 52cm Foil, he is listed at 5'10". That is a road setup. He slams the stem, runs a 130mm stem. Personally, I'm 5'10.5" and run a 110mm stem with -10 and zero offset seatpost....that is my road setup. I don't do TTs. But if I had imagined myself needing something more TT, then the 52cm is the only frame that would lend itself to that, but wheelbase, positioning..who knows how that would play out in reality trying to do two jobs of Road/TT.
You could use the Foil, but you need to lean towards a good road setup, and compromise on the TT part, and not the other way around if that is your plan. The only way to get a real TT setup, is run a dedicated TT frame.
I would say only the BMC TMR, maybe the new Felt, S5 would lend themselves better to TTs setups with the flip seatpost that are somewhat designed to give you that steeper seat angle and more forward to TT positioning.
I don't think Scott ever had intentions of making this a dual purpose frame. They want you to buy a Plasma for that.
Of course not, not after pouring all that money for R&D.
I looked at the TMR but the price is quite close to the Foil and Plasma combined, all having Ui2.
The 52 cm will have too much drop for me, 54 looks better in terms of fit. Spacers on 52? I don't know, I may be stoned to death for that.
All in all, I'm more inclined to the 54, as the bike will be doing %95 road riding and %5 TT's.
The dual-purpose bike project is moving further and further away...
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