So my 2018 Trek SC frame came with a narrow base bar. I still have my 2016 Trek with wider base bar. Should I swap these out? Is one more aero than the other?

You say that but the funny thing is before they announced the bike, and before I saw any pictures of Trek riders riding them, I built a 2017 in a similar but brighter scheme. If I remember which may be awhile knowing me I will take a good pic and post it.

How do you measure "wider"? Depth or width between the brake levers?

Trek made a shallower UCI legal base bar, but I thought they stopped making those when the UCI gave up on the 3:1 rule. If you mean bar width, then by all means go narrower. Wide is slow.

I think its the UCI bar that came with the 2018 Trek SC. The one I had on my Trek I guess is the aero base bar. I'm wondering if there is much difference between the two or is this a marketing scheme.

I'd guess difference is minimal at best. I know in their white paper there's virtually no difference between the deep and narrow fork. I'd guess the base bar is the same.

I am trying to decide between frames right now and had a few questions about the 2018 Trek frames. Does anyone know the tyre clearance? Also is the Di2 battery integrated or does it need to be mounted on the frame? Cheers!

Di2 battery gets mounted in the seatpost.

I've ran as wide as a 26 mm turbo cotton on a zipp super 9 on the bike. You will need to move the washers to the other of brake arm to do so.

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Awesome! Thanks man!

I love the paint scheme, but cannot for the life of me understand why a project one bike doesn't come with an optioned painted draft box!? I mean they're already painting the frame to your specs, why not offer the draft box paint to match?

I have a 2015 SC that started life as the "stary night" paint scheme (black red posted above) and I had it painted my custom colors. Having the draft box painted sets it off and makes it look complete.