I’ve just build my ideal titanium winter bike!
I found my “winter bike” does about 10 times as many miles as my “summer bike” – as it’s also my commuter, trainer, tourer, go to bike. Which is why when I was looking at adding a really nice bike to the fleet, I replaced that, rather than the high days and dry days one. I’ve not ridden anything else since my Kinesis Tripster ATR landed at the end of last month. It’s not cheap, but then it is very good – and ticks all the boxes bar the Di2 / internal cable things you’re after.
For donkey’s years I’ve been of the opinion that a winter bike should have cheap kit on it, in case you damage it or wear it out, but it seems crazy when you’re doing so many miles on it, not to have it nice. With 28mm Conti 4 Seasons on, some P35 mudguards, your 105 groupset and some decent mechanical discs (have a look at the TRP Spyres) you’ll be laughing year round – not just when it’s dark and grey 🙂
Mine’s got an Ultegra 6700 groupset, Halo Aerotrack rims laced to some lightweight, cartridge bearing Novatec hubs (easy maintenance and reliable), Deda bars, stem and post, Flite Gel Flow, Hope BB (as before), Crank Bros Candys, the new TRP Spyre disc brakes and it’s just shy of 20lbs.