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Are beam frames making a comeback?

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  1. cole June 14, 2012 at 2:55 pm -  Reply

    From what I’ve read, the idea is that decoupling the drive train from the seat allows the two to have different degrees of rigidity, so that the drive train can be as stiff as possible without the deleterious effect on the rider that occurs when such is done on a standard frame.

  2. Nicholas Hardrath June 14, 2012 at 2:55 pm -  Reply

    I think it’s great. I would like to think there’s always room for some interesting design and engineering efforts – especially where the UCI enforce a lot of the silly laws they like to (most recent, the new rule that outlaws “compression socks”, it’s just ridiculous). I think some true controlled tests need to be done by Mr. Pearson to see whether there is a tru benefit aside from the software tests he has tested on the frames thus far. And let’s be honest (coming from a road cyclist and triathlete)- triathletes will buy into any marketing hype- but I would get behind it with positive results.

  3. Champs June 14, 2012 at 3:08 pm -  Reply

    It goes without saying that they’re ugly, but the design is certainly practical for smooth rolling in triathlons and casual rides.

    At the race level, I don’t see anyone wanting to go beam. They’re still working out the engineering to keep saddles in place on compact frames.

  4. Nick F June 15, 2012 at 12:42 am -  Reply

    I couldn’t be more excited. That Z1-Eleven is beautiful, and beam bikes in general are an incontrovertible affirmation of what concept design and this blog are all about – letting new materials and an open mind build a better machine.

    I hope they take over the racing world (leaving a shamed UCI in their wake) and I hope they trickle down in to more general cycling as well – I’ve been commuting daily on a Softride for about 2 years now and the comfort is fantastic.

  5. Bubba Nicholson June 15, 2012 at 2:47 am -  Reply

    Bicycles do not ride themselves. A spandex “coat” that enwraps the rider, front wheel, rear wheel and drive train would be far better aerodynamically and much less expensive.

  6. art June 15, 2012 at 1:36 pm -  Reply

    I would expect the aerodynamic advantage to be minimal. Rider comfort is key though. I think the market is finally responding to the reality that regardless of what the UCI says about TT bikes, they’re governing races that are a quarter to a third of the length of an Ironman bike leg, and none of those guys are running a marathon when they’re done. The optimal solutions for the two kinds of racing might be very different.

  7. Christian Wendenburg June 17, 2012 at 5:00 pm -  Reply

    I have Graeme’s 2009 NZ-1 frame (se my photos and posts). I can tell anyone that Graeme’s frames are AWESOME. I’ve put 8-9 IM races on it, and will continue to use if for IM NYC, IM Cozumel, and IM KONA 2013. Yes, that’s right, I will be on Graeme’s frame at KONA in 2013.!/photo.php?fbid=459266830757031&set=a.459251490758565.124709.100000211550281&type=3&theater

  8. Christian Wendenburg June 17, 2012 at 6:01 pm -  Reply

    I just counted the races I have done on my Pearson GC-1 Concept since 2009. I have done 10 full Ironman races on your frame. So, that’s 1120 miles (1814Km) of racing. That does NOT include the additional number of 70.3 races I have done since 2009 on the frame. So, anyone who wants to know how well your frames hold up, can contact me for validation.
    I stand behind Graeme’s frames 100%.

  9. Christian Wendenburg June 17, 2012 at 6:07 pm -  Reply

    Also, by the way….I also stand behind 3T Ventus aerobar, Rotor TT cranks, Nokon cables, KMC chains, Look Keo Blade Ti pedals, and Simkins Eggs brakes.

  10. Enrico June 19, 2012 at 7:52 am -  Reply

    aerodynamic? is there anything better than a “good” recumbent bike? … even without fairings

  11. Ron George July 1, 2012 at 11:41 pm -  Reply

    I would love to see some aerodynamics testing done against a comparable bike that had a seat tube. Perhaps the best way would be a CFD simulation ? I don’t know if comparing to a other TT bikes like Specialized or Shiv will give you reasonable conclusions, I mean you’d have to be pretty sure you’re only seeing the effects of a missing seat tube when you do that sort of comparison, and other features on the Shiv or Cervelo should not affect results.

  12. Kimmo July 12, 2012 at 10:00 am -  Reply

    Beam bikes are win. F*** the UCI; damn them and their retrotech fetish to hell.

    Leaving aside aerodynamics for a moment, such a beam design craps all over the diamond frame from a simple engineering perspective. The refinements and tradeoffs between stiffness and comfort managed with the diamond frame up to this point are all rendered a sad joke when you remove the seat tube and seatstays. Now, you’re free to make the chainstays deep as possible for maximum beef around the BB. And given that it’s a natural for a beam bike to have a separate beam, that introduces a whole world of sizing flexibility, and makes it feasible to offer optimised off-the shelf frames for folks who may be short but heavy and powerful, or tall but light. You could have four or five frame sizes in two different weights (perhaps with a longer head tube option), and maybe as many options for the beam, et voila. But the best part of all? No more futzing around with chainbreakers or special links – just remove a jockey wheel and your intact chain is free. That alone is reason enough to run with any excuse to get rid of seatstays.

    Then there’s the fact that it’s simpler than a diamond frame. And if it’s simpler and it does the job better, it’s more elegant. And if it’s more elegant, it’s more [u]beautiful[/u]. Simple as that; if it looks ugly to you, it just means you’re not looking at it right.

    As for aerodynamics, there are a few thoughts that seem obvious to me… first, air in the region of the seat tube is already turbulent, so my feeling is that changing the silhouette of the bike around here (as viewed from the side) perhaps isn’t going to do a very great deal… it strikes me as diminishing returns stuff. However, seatstays hang out in the breeze, and the brake… and by basically removing everything behind the head tube except the back wheel, it does seem possible there’s quite a bit less turbulence involved for the air passing between the rider’s legs. I imagine the aerodynamics of the rear wheel would matter a little more on a beam bike. At a guess, I’d say the aerodynamics of the Z1-Eleven here would have to be at least as good or better than the best diamond frames, but probably not quite as good as a Z frame like the Lotus Sport 110, which was designed with aero as priority #1.

    That’s my 2c…. you might not think such armchair musings are worth even that, but I’m pretty sure I haven’t gone out on a limb anywhere.

    • Kimmo July 12, 2012 at 11:17 am -  Reply

      No editing is a bummer.


      • Kimmo July 12, 2012 at 11:26 am -  Reply

        Hmm, no underlining either. Oh well, got it right the first time I guess.

        Which I’ll have to get good at to post around here it seems, otherwise I’ll look like a spammy mcspammerson replying to myself all the time.

  13. Mike December 11, 2013 at 4:17 pm -  Reply

    Just a few additions from an old rider who used to train and race a Zipp 2001; first, the Zipp frame was tested against the other leading aero frames (double diamond, softride and z frames (hotta, lotus) back in the late 90s/early 2000s and was far faster for aerodynamic calculations. When paired with a deeper rear wheel, that advantage becomes increasingly important. Also, the rider is more aerodynamic on a beam frame with a wider aerobar position than current UCI competitors (it allows for less turbulence over the complete package and greatly reduces the vacuum behind the rider otherwise experienced on a double diamond frame). Finally, the Zipp frame allows for slight side to side movement besides the up and down of the shock in the beam; this allows the rider todeliver far greater power and for a very long time, as it allows the rider to move in a natural wave pattern (all animals move in waves and fighting against this movement is counterproductive for long term performance). I have my own experiences which make me a believer (including hit 78 mph in a national park) but i hope this provides the opportunity for those interested to know that those of us who were lucky enough to race them, there were percieved advantages and for those still skeptical, i hope you understand that it is fine that you do not appreciate a beam bike’s looks, but that is fine, because we are all allowed to enjoy different things.

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