Installing mechanical group set on "electronic only" frame I've been upgrading my Cannondale CAAD3 road bike from 2005 step-by-step over the years as things get worn out. Now its time to upgrade the frame.

I have an eye on a Cannondale SuperSix Evo Hi-Mod frame but if I understand correctly this frame is designed for electronic groupsets only. 

Would it be possible to non-intrusively install a mechanical set on this frame? (that is, without drilling anything, for example, by just using tape externally or some other pieces, might not look that good though).

At some point I will get an electronic groupset (I'll need to replace that in the next year/2 years anyways), but I don't want to do it now, yet I need to replace my frame.
I have a solution for you (if you haven't got the electronic groupset already), inspired by road bikes from '70s and '80s era. 

Namely, the rear brake cable on the top tube. 


on some of those bikes runs through the large eyelets through a very lengthy outer cable (the eyelets merely hold the cable in place):



while on others there are two cable stops near the ends of the top tube and the inner cable is visible:






Now, if you do the same with your derailleur cables, namely run them through lengthy outer cables, the force required for shifting is in fact exerted only near the brifter and the derailleur itself, thus places prepared for clamping.

The only question is whether the outer cable stiffness (in length) is high enough to assure shifting accuracy.


  I don't own the pictures, they are purely for illustration.