Mike Burrows urban prototype

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  • Here is the original, in the hands of the man himself. There is just the one. He has since moved on to other things.

    Sacrilege or not, some changes were needed. This is, after all, designed to illustrate an idea more than to render it to perfection. So now we have this:


    The handlebars are cut down Nitto with black horn tips machined to fit, the foam blended to the forms. The brake lever is stock Paul, with the pivot pin changed to carbon fibre. A light is integrated into the stem with a leather strap. The stem cap is machined from horn. The seat and seatpost are made from unidirectional carbon fibre by Smud Carbon. The fixed gear is changed to freewheel. The cranks are the same, but the chain ring is now carbon fibre. The pedals are leather sole preserving Schindelhauer.

    Other than a rear brake, needed are mudguards, and perhaps a set of cranks more in tune with the rest of the frame. Any suggestions?

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  • is that a BLB Notorious Special Superfly Copper Edition?

    maybe a lion pelt toptube cover would go nice with the horns?

    back-of-saddle to front-of-saddle drop is deeper than saddle to bars?

  • why is the back cog so far away from the middle of the fucking wheel? this whole things is so infuriating brb having a xanax

  • Horn is interesting, mechanically: the reason I have been playing with it, though I like the feel of the material.

    The saddle configuration is peculiar, I know, but for some reason suits me better than the conventional.

  • The cog is in the middle of the wheel but deliberately offset from the centre of the rear part of the frame. The bearings sit inside an obliquely drilled cylinder that can be rotated to adjust the position of the wheel relative to the frame.

  • how eccentric

  • Two inches eccentric. Burrows realised it does not matter if the two wheels are not perfectly co-linear, for a couple of inches disparity is trivial in proportion to the wheelbase. That then allows him to dispense with a rear triangle, mounting the back wheel off a monolithic tube that will be stiffer for the given amount of material used in making it than any simple triangle could be. It may look like variation for its own sake but the major moves here are motivated by engineering.

  • do you have any pics of the NDS?

  • Here it is:


    The wheel is laced onto a shell that connects to a solid axle via a hex profile, as does a driving wheel on the other side. The bearings are inside the insert within the frame. There are nylacast spacers inbetween.

  • anti no ?

  • You should change the saddle angle. The nose should be pointing down way more.

  • weeeeeirrrrdddd....

  • Do you just call the non drive side "non side"?

  • calmed down a bit now. more bikes should look like tex-mex grills imo

  • Not at all. It's an interesting engineering experiment.

    edit; well the handlebars are anti, agreed.

  • Reminds me of my Airnimal Joey

    Obvs without the mono-stay

  • Now stolen: news of any sightings gratefully received.

  • Damn, but luckily won't be hard to spot.

  • Happy to reward anyone who does. It took a great deal of thought and effort to make.

  • More details, how, where (most relevant) was it stolen?

  • It was taken from inside a private courtyard, just outside my window, in a mews behind High Street Kensington. I never leave it outside, but was distracted and it ended up there overnight. It now looks like the attached, except that the handlebars are clad in red leather.

    I was going to dimension the frame yesterday morning, so I can reproduce it just in this eventuality, but did not get round to it. Perhaps I can persuade Mike Burrows to share his frame drawing even if I doubt he will be interested in making another himself.

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  • sorry to hear about the theft.

    looking at that rear wheel offset cog arrangement makes my brain hurt.

    hope it turns up

  • Many thanks.

    Perspective makes the rear weirder than it is. The shell of the hub and the axle are a single piece of machined metal mated through a hex profile to a driving wheel with a standard freewheel on it. The axle spins on two bearings enclosed in an asymmetric cylinder clamped within the frame. That is all there is to it.

  • That is all there is to it.

    Me right now:

  • Oh shit. this is definitely a unique piece of engineering. Hope it will find its way back to you.

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Mike Burrows urban prototype

Posted by Avatar for obscurant @obscurant