I'm considering upgrading my current ride (2014 BMC TM02) to a new ride (2018 Speed Concept). The BMC is a very fast bike and fits me very, very well (longish top tube).
My reasons for wanting to upgrade are mainly that the Speed Concept has a much nicer and cleaner setup with an integrated cockpit and front brake with no exposed cables, and the integrated bento box and storage. The BMC has no integration, an exposed front brake and cable, and no storage options built into the frame. The derailler and rear brake cables are run internally but are exposed as they exit the aerobars into the top tube.
Before I determine whether to plunk down the $ needed to make up diff between selling the BMC and getting the Speed Concept, can some of the aero experts here give me a sense of what I'm losing time, wattage, or aero wise with the non-integrated, exposed cable set up of the BMC? Don't need precise numbers or anything, just a sense of whether or not its a significant cost/loss.
I already have aero F/R and disc wheels, along with a powermeter, so buying those as "upgrades" isn't needed.
Thanks in advance!!