The Dentist's Chair - Cervelo S2 Di2

Posted on
Page
of 6
/ 6
Last Next
  • Right, next project. The Brompton's going to have to take a back seat (again) because I need this bike for a holiday in three weeks' time, and I'd like to get it fitted between then and now as Cycliste very kindly bought me a bike fitting at Condor for my birthday last year.

    As the title suggests, it's a Cervelo S2. The summary at the moment is that it's going to have an Ultegra Di2 groupset, mildly hacked with an internal battery and miniture satellite shifters for the rear mech under the bar tape, Zipp wheels and mostly Ritchey finishing kit.

    So, frame and forks in position:

    But not for long, as the frame needs some modifications to take a Di2 install. The first step of which is to drill a hole in my nice new frame. The hole needs to be in the top of the top tube, just behind where the cables for the front derailleur and rear derailleur would go on a mechanical install. While Cervelo don't drill the hole they do at least show where it needs to go.

    It's a bit nerve-wracking drill a new carbon frame, so I started with a pilot hole and expanded it gradually. It turns out there's an aluminium plate bonded into the carbon laminate at this point, presumably to add a bit of reinforcement around the holes.

    Having attacked the frame with a drill, it was now time to attack it with a sanding cylinder in a Dremel. There's a hole in the bottom of the bottom bracket shell, and on a mechanical installation the shifter cables would come out of this.

    It needs to be expanded so that you can fit the Di2 junction box inside it (although I'm now wondering whether I should put the junction box inside the seat tube instead) which it now does.

    I've also cut down the steerer tube and fitted the forks/stem/bars. I'm using an expander plug at the moment - the 3T forks come with an ali shim and some epoxy to bond it in place, but I'll fit that (and slam the stem, probably) once I've had the bike fitting done. The stem's probably going to be changed too, to a Ritchey C260 which isn't red.

    That's it for now. More to follow.

  • Fuck, taking power tools to a carbon frame. Hats off. This gawn be sweet.

  • are you a dentist?

    (genuine question btw)

  • Plans bike fit, cuts steerer before hand... /:

  • This^!?

  • Holy shit I was trawling Cervelo forum just last night checking how this might work after seeing Merlin doing Di2 kits for £700

    subscribes

  • are you a dentist?

    (genuine question btw)

    No. Genuine answer.

  • Hygienist?

  • Plans bike fit, cuts steerer before hand... /:

    Calculated risk. I've left 15mm of spacers on there, with the stem pointing down. If 15mm of spacers and a stem flip can't get the bars high enough then:

    1. The frame's the wrong size
    2. I'll give up cycling and just do stretching until my flexibility improves
    3. I'll go for a second opinion

    I'm sufficiently confident, however, that my existing bikes are sufficiently close to what I need that a bike fit will involve fine tuning rather than radical changes. And if I'm wrong then meh.

  • Hygienist?

    Nope. Worse. Evil bastard scum-sucking lawyer.

  • Classic conundrum -
    Bastard lawyer + cervelo di2 > hygenist + shimano sora?

  • Calculated risk. I've left 15mm of spacers on there, with the stem pointing down. If 15mm of spacers and a stem flip can't get the bars high enough then:

    1. The frame's the wrong size
    2. I'll give up cycling and just do stretching until my flexibility improves
    3. I'll go for a second opinion

    I'm sufficiently confident, however, that my existing bikes are sufficiently close to what I need that a bike fit will involve fine tuning rather than radical changes. And if I'm wrong then meh.

    I assumed as much (:

  • Great thread title.

    Stem length makes the baby Jesus cry though, hoping your fitter gives you something more manly :)

  • Yeah, the stem was an experiment from the Red Bike which then grew a longer stem. It's a 90mm stem IIRC, and I normally have a 110mm. It'll do for now in keeping the handlebars off the floor.

  • Nergd for black wheels.

  • Has the "red bike" been posted in anti yet?

  • If that's the worst you could spot on the Red Bike in terms of nergworthy anti-porn then I think I've got off lightly...

  • Not nergd for the anti, but the lack of dedication!

  • Square holes are a structural disaster, ships have round portholes for a reason! round dem corners, now.

  • Yeah, the stem was an experiment from the Red Bike

    Arg! My eyes!

  • Yeah, that's what Cycliste said when she first saw it (or words to that effect). Meh. I like it. It stands out nicely in photographs. Which is important.

  • Square holes are a structural disaster, ships have round portholes for a reason! round dem corners, now.

    Don't panic, that's not the final version. The hole will need some fettling in due course, and when it's done it'll be smooth and lovely with no stress raisers whatsoever.

  • Phew...

  • I dig the QC sticker right next to 'his holiness'. Good stuff.

  • lots of info on this on the cervelo forum... Im pretty sure it has been done internally without any need to enlarge the bb hole as it was quite big to start with. Take the fork out then you can guide the internal wiring past the ics 3 pipes.

    i was really close to doing this to my s2 but coudnt face drilling a hole in a new frame so went with a cable group. dont forget to remove / fill the riveted cable stop on the chainstay as it becomes redundant.

  • Post a reply
    • Bold
    • Italics
    • Link
    • Image
    • List
    • Quote
    • code
    • Preview
About

The Dentist's Chair - Cervelo S2 Di2

Posted by Avatar for Brommers @Brommers

Actions