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amey-
He's a bit busy but he's already doing some calcs for me. Problem is I keep finding new bikes and then finding new problems with the ones I find. I probably could just use a 'normal' road bike with Di2/discs and stick with 28mm tyres. The longer wheelbase of the 'endurance' bikes though should make for nicer handling particularly when sleep deprived, just lots of them seem to be too jacked up at the front/too short. Top tube can be fixed to some extent with a longer stem but if it's too high I fuck my TT position.
hippy
Tarmac 56cm S/R = 564/395
Synapse 56cm S/R = 590/386
Synapse 54cm S/R = 570/378
Diverge 56cm S/R = 590/387
Diverge 54cm S/R = 565/380
Pivot Vault M S/R = 570/388
Gen Datum M S/R = 585/385
Gen Datum L S/R = 602/395
So smaller frame sizes of these 'endurance' bikes get closer to my Tarmac but then I'm going to lose room for my feet - bigger toe overlap with midfoot, maybe lose a bit of comfort, maybe gain faster handling (which could be good/bad for ultra).