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These are flat mount:
http://www.bike24.com/1.php?content=8;product=143255;menu=1000,4,320,322
amey-
Cheers.
Is there somewhere doing a full kit and kaboodle deal on Di2 and those reasonably cheap?
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Is that the cheapest place to get them you've found?
There's not a lot of price diff to local prices:
https://www.evanscycles.com/shimano-di2-r785-sti-hydraulic-disc-brake-with-rs805-flat-mount-calipers-EV253007
hippy
So, there's only 150-200g difference in frame weight between the models at the ~53cm size. Not sure what that will equate to at my 56/57cm size but it won't be all that much. Mudguard eyes are useful back in the UK when it's not being raced so the 4S wins on that front. It also wins on tyre clearance.
The 4S has Flat Mount disc mounts vs. Post Mounts. That's not going to make any difference I don't think. The 4S is cheaper and I already own the rim brake version of the 4S so I'm happy enough with the design already :)
Looks like the 4S has #1 spot.
Question then is, what bits do I then need for it?
Are these BR-785 units (http://www.bike-discount.de/en/buy/shimano-ultegra-di2-6870-st-r785-hydraulic-electric-kit-internal-internal-401953) Flat Mount and suitable for this frame? "It is best recommended that you run a 140mm rear rotor." say Kinesis. Ok!
I'll have a chat with my partner in grime tonight and see what the go is with ordering one.