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Since the Tripster doesn't have the toptube cutouts, I was thinking about this problem recently.
What about running it via downtube, up seattube and then out the seatpost somehow (either open top under saddle or with hole drilled below clamp but above frame, ie. in the frame slot?
hippy-
This is what @coldharbour has done on some of his builds. He drills through the top clamp of the seatpost so it can run through and then attach to the back of the saddle.
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I mean I like the sound of that, but it seems the long way round to get there. Plus I'm not really up for drilling. I think either the Di2 under the TT or a wrap around @gillies is right, I think there should be space under the frame pump as the pump contact points are very near the joints and with my Zefal there is a nice amount of room between the pump and TT. Maybe @gillies pictures and my experimentation will help you decide....
motoko
youramericanlover
I have a track bike with no rear brake (so no housing to piggy back on) which I want to run a seatpost mounted secula. Is there any slightly nicer looking way to run the cable across the top tube other than a ziptie? I have a frame pump under the tt so thinking winding it around is going to catch the cabling. Also, does the cable need housing and if so, any suggestions?