Airtight Cycles - New Frame Builder

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  • Hi all!
    I'm a new builder in Brooklyn and I'd love to get some feedback from across the waves.

    This is my Single Speed Crit Frame (crit front end geometry and bb drop with a track rear end)
    The seat stays are staggered so the drive side is more stiff and you lose less energy to the frame flexing while keeping a more comfortable ride in the saddle.

    I took these photos before I received and installed the rear simkins egg brake. I also have a Campy Veloce I'm putting on the front end (you can all shame me at once :)

    I'd love to hear your thoughts!
    -Mat


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    • ATC Möbius Edition 001-2.jpg
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  • Minus the white tyres thats beautiful IMO, the grown lugs on the forks are beautiful!

  • Most important question : Will this be ridden at Red Hook this weekend?

  • Visually very pleasing.

    I think it's a very unique twist on a triple triangle frame and I love the lugged mounting of seat stays to the top tube.

    Those track ends are ugly. Put some premium ones on.

    What's the geometry?

  • The frame is nice. I really like the fork.

    Maybe the TT/SS juncture is a bit much. I'm not really a fan of fancy lugs. The track ends look a little Elvish! Some classic, Campag style 'ends would get my vote rather than Paul's etc.

    Legor Cicli has built a few asymetric track frames. I really like their stuff.

    I like your branding. Good luck and thanks for letting us have a look.

  • Welcome and thanks for sharing. I wouldn't bother "justifiying" the staggered stays in a technical point of view. Because it is hard to believe, really. It is, however, pretty to look at if you are into that sort of thing, and no doubt someone will be.
    Best of luck for the future.

  • Legor Cicli has built a few asymetric track frames

    I believe Landshark also did some staggered stays on track frames. Then you also have Panarello and it's asymmetric justification .. http://www.pinarello.com/en/technology/t­hink-asymmetric

    But back on topic with my 2 cents .. Looks like some very nice work. I would say, I preferred the simpler seat stay / top tube lug on the Möbius Aero Crit shown at NAHBS and the NAHBS build would be something closer to what I'd ride myself to be honest rather then the one shown on this thread. One question / comment .. Why Simkins? Rob English time trial bike last year used a TiRig brake and internal cabling that exited just before the bottom bracket which was a rather neat design to hide the rear brake.

  • The seat stays are staggered so the drive side is more stiff and you lose less energy to the frame flexing while keeping a more comfortable ride in the saddle.

    Show me the numbers. This is even more incredible than the 'laterally-stiff-vertically-compliant' crap that BSNYC routinely, and rightly, lampoons. At least the crabon merchants are actually using curved tubes and non-circular cross sections, so some anisotropic compliance is possible, even if it's pointless.

  • That door!

    RIP JADE BTM

  • Nice amount of scoblebricks though.....

    It's nice.....sounds like I'm taking the piss, but it's nice.

  • How did you fit the rear brake? under the BB?

  • n/m

  • It got a freewheel you muppet.

  • noticed that. Looks like theres a recessed brake mount by the bb

  • more to the point, how are you routing the BB-mounted brake?

    Otherwise, I like it. It's obviously a show pony, but that doesn't mean it's not pretty. I'll never be a fan of white tyres, gold spokes et al, but as an overly elaborate exhibition piece, it's a good example of what the builder can do.

    I would echo the above points though - don't try and justify a unique looking single speed as a crit racing bike with improved torsional stiffness or whatever. Without the numbers to back it up, it's easily rubbished.

  • Though the stay science is probably complete woowoo bullshit, but I'm always a fan of triple triangles.

    Post photos of an unpainted frame though. That paint could be covering filler on those brazes

  • noticed that. Looks like theres a recessed brake mount by the bb
    WOuld seem consistent with this:

    rear simkins egg brake.

  • Beauty! Frameset wise that is..

    The build is horrible

  • Hey Jeez, Lkjh and all!
    thanks for all the good and please keep punching as well!

    to answer a few. The front end is made to take more real road impacts (more offset with a 74 degree HT angle) and hold true while the BB drop is lower for a lower center of gravity. That of course can be adjusted to preference. I think it feels great as a response to the front end. the rear end is a pretty tight track geometry.

    After I came up with the design and built my first one, I went to study under Yamaguchi and asked him what he thought about the offset seat stays. He said basically the same thing I was thinking. It makes the drive side tighter so you lose less energy to the frame flexing. He then went on to tell me that his first world champion frame for the US team had asymmetric seat stays (and no seat tube!) This is a copy of that frame:
    http://www.flickr.com/photos/dancingweap­onofmassdestruction/sets/721576035775186­27/

    Some builders today do something similar by increasing the size or wall thickness of a drive side seat stay, but you don't notice it as much visually.

    Ha! Those rear track drop outs are actually cut by waterjets at Nasa! I had to use them! You can also drill and tap them for an instant derailer.

    This frame won't be in the Red Hook Crit, but that would be awesome! I'm definitely searching for some powerful racers to put these bikes through the paces.

    I believe I've seen some English frames with some Simkins as well. The Simkins have pretty amazing stopping power. Have you ever tried the tririg brakes? I'd love to see how they feel.

    This show pony is my bike. I love to ride it. Of course I had to pimp it out a bit, but It's got a lot of scratches already..

    If you want to check out the brazes, I post a lot of the making of on facebook. facebook.com/airtightcycles

    and yes.. ha! the component build leaves much to be desired..
    check out my next one.. I'll post soon.....

  • It's nice.....sounds like I'm taking the piss, but it's nice.

    How very English!

    ;-)

  • The frame has some lovely work. I like the branding. The dropouts are great (they remind me of my old Mercian)

    As everyone else is being so polite I'll just say that the final build is not to my taste.

  • I believe I've seen some English frames with some Simkins as well. The Simkins have pretty amazing stopping power. Have you ever tried the tririg brakes? I'd love to see how they feel.

    Yes, Rob has certainly had Simkins on some customer builds, e.g. here. The TriRig brake is definitely more aero, not sure how well it performs in a fair test as mine has to contend with being pulled by the crappy integrated lever on the 3T Ventus. Nick Salazar built it with Dura Ace dual-pivots as his reference, and while he obviously has an interest in the matter, he's also a rider who uses his own products, so I don't think he'd have released it until he was happy to have it on his own bike.

  • I'm impressed that you can build this; less so that you have built it.

  • here's a few without paint


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  • here's my latest.
    I'm much happier with the overall frame and component builds


    18 Attachments

    • Airtight Cycles Möbius Aero Crit-1.jpg
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    • Airtight Cycles Möbius Aero Crit-18.jpg
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Airtight Cycles - New Frame Builder

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