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How stupid would it look
Fairly stupid, but that's not the real problem. Easiest to solve is that it fits 31.8mm bars, and TT base bars are 23.8 (or 22.2 in odd cases). Less simple is that the sub-lever has no reservoir, so you'd need to connect a remote reservoir to the inlet port. That's not going to do much for your aeros unless you route the hose through the bars and hide the reservoir between your arms.
stupid question...
I have a TT frameset and a full (road) hydraulic groupset. hydraulic TT levers are both completely out of stock and stupidly expensive.
GRX has a sub brake lever which is available and sensibly priced.
How stupid would it look to flip one of these around and try it as a TT lever...
So no brifters at all - braking via sublever, shifting via Di2 on the aero extensions on the little blip buttons
(option b is just cable disc brakes)
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