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Also... it might be possible to do the shifter button mod without actually cutting the shifter wire. Peal back some of the insulation to expose the wire but don't cut it. Then solder the FSR wires to the shifter wire and tape it up. Doing that would leave the Di2 function unmodified but also...

The "cut the Di2 wires coming from the shifter buttons" approach works because the Di2 shift buttons are just switches. You can't cut the actual Di2 cables in the top tube (or anywhere else) for this because they are a proprietary version of a CAN bus - its two wires carrying digital signals...

Creo owner - lots of variables in your question. I live in CA and am able to keep my heart rate below 150 on my rides here if I want to (above 160 and I quickly run out of breath). There's a local 20 mile ride with a 14% grade for 1000 ft or so in the middle of the ride. Initially I couldn't do...