Thanks to marcag, desert dude, and bigvern777 for the responses.
Unfortunately, this is all mooted now.
I somehow thought I could get a bike with higher stack by buying a Plasma Premium 3 (vs the Plasma 3 TT that I currently have). On the Plasma 3 TT, the holes in the steer tube are pre-drilled, alas my curiosity as to whether this would be true in other non Plasma 3 TT frames.
Then two people helpfully pointed out that the geometry of the Premium 3 is the same as that of the 3 TT, so effectively, I can get a higher stack only by going a size up.
Bigvern777 wrote:
Hey - I bought the 2013 plasma 3 di frame last year and built it up as a 1x myself so I’m familiar with it. I’m not sure I totally understand your question though.
There are two holes in the steer tube section, one at the base of down tube that goes to the rear brake. Another hole in the back of the right chainstay that goes to the rear deralieur. Happy to take photos and email to you if you want to pm me.
Routing the cables is a pain. I don’t use di2 I just made it a mechanical -1x. So my rear brake cable enters at the head tube and then near the bottom bracket. The rear deralieur cable enters as the head tube and then the chainstay. There is a tiny door on the drive side above the bottom bracket that can be removed - I think intended to hold some of the di 2 electronics but removing it helps a little running the cables. I built my frame up and think it’s. Near impossible to run the rear cable with the bottom bracket in.
out of curiosity, did your bike come with the flat stem? If it didn't, am I correct to interpret your post as saying that the steer tube was pre-drilled?
Could come in handy if I decide to switch to a size M
desert dude wrote:
IIRC on that bike there are internal channels for all the routing.
If you want, PM your email address. I can show you where we drilled out my frame to run things internally. IIRC my mechanic, (bc let's face it, if I did this I'd have to get a new bike) said something about being able to get everything into the internal channels for the routing on my bike
out of curiosity, how are you routing your Di2 and brake housing through the Alpha One bar on your Plasma