Internally routing or Hiding Di2

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  • Ahh right, so only the front brake goes through the fork, the rest goes through the headset.

  • Yeah, out the stem, through those lovely spacers, round the steerer to the back of the bike.

  • Absolutely spot on. What's the tyre clearance like? Capable of taking a 30mm tyre?

  • Seems like all these headsets with routing require 52mm ID head tubes.

  • 28 is a yes, not tested owt else yet but can do.

  • 28 would do. No point having crazy fast aeroz and big fat tyres.

  • yes. maybe a bayonet fork or front fairing is a better idea.

    Front brake hose in front of headtube under fairing.
    rear stuff on top of stem (under a cover) into a top tube that is slightly higher

    Inspiration:

    (just the shapes , not the actual brake setup)

    or extend the headtube (with a extra tube :)) like this:

    https://cyclingtips.com/2019/12/bikes-of-the-bunch-stinner-aero-camino/

    just ehhmm... neater than these examples :)

  • If you decide you want one give me a shout and I'll get something sorted.

  • Oh, I'm in, subject to price of course. I really don't need a steel framed bike with all internal cables, but I really want one. And I haven't added to The Big Pile of Forks for a while now.

  • Not revealing your secret source for the forks then?

  • I'm assuming Columbus or Reynolds will produce them eventually. If not, it's time to get some 4130 on the lathe, and see if Peter at Ceeway sells the braze-in lower Columbus integrated bearing races separately from the top ones.

  • @snottyotter do you work for MI6?

  • Can't blame them for that. I'm happy to pay a few extra bob for the peace of mind that comes with the testing they've paid for. It's probably AK, but life is too short to find out if that's true.

  • I don't know the super secret source, my boss sorted all that out.

  • His name is M.

  • 44mm headtubes look chunky as it is on round tubed bikes. What would a ~55mm OD HT look like

  • Chonky AF.

  • If he was the head of MI6 he'd be referred to (other than in James Bond film-land) as 'C' after Commander Mansfield Smith-Cumming. The man who noted that every man (as opposed to every woman) had his own inbuilt supply of invisible ink. Thank you QI for more useless information.

  • As snotters says, pretty studly. I'm working on the basis that a T47 BB shell, a 44mm Spirit downtube and a wide but oval top tube will make everything look roughly proportional. With some extra chonky Max chainstays.

    I'm also planning on having the headtube as short as possible and using spacers between the headset and stem, which will no doubt cause many people who worship at the shrine of the custom frame to get deeply and vociferously upset.

  • Interestingly, seems like we’re building the same bike. T47, 44mm DT, Max chain stays. Round TT tho.
    Matching track frame to boot

  • unconvincing ;) i knew the teeth argument was coming

  • I think an EC44 bearing is the same size as a ZS52. Providing the bearing itself comes out of the cup (unlike CK), it may be possible to use EC44 top and bottom with the top one using the internals of one of these internal routing ones

  • I had a lot of trouble getting the hydraulic line through a T47 BB shell. Had to make a custom sleeve to use in between the cups, drilled the NDS cup to run the line through and shortened the drive side cup on the lathe to get the di2 wire into the chainstay.

    @PhilDAS, interesting tactics. using a 1,5 external top headset bearing with a 1,125 steerer (or tapered steerer) for extra room to run your internals.

  • Feel free to try riding a bike with a single 7mm deep bearing as a headset. Make sure you get video footage. It might help pay the dental bills.

  • It is. But the clearance between the headset cup and the steerer tube is a bit marginal if you're trying to squeeze a hydraulic brake hose down there. Also, you'd face the problem that AFAIK no-one makes EC44 top headset units designed for a 28.6mm steerer, so you'd end up with a rather fugly top cap arrangement.

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Internally routing or Hiding Di2

Posted by Avatar for PhilDAS @PhilDAS

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