Help design the world’s most efficient superbike, win an iPad 2!

This is your big chance to help design the lightest, most efficient racing motorcycle ever made. And win an iPad 2 for your effort. Interested? :)

Update! Winners announced, find out who had the best design.

Photo credit: Arash Moallemi

The challenge, should you accept it, is to re-design the triple clamp for the Amarok P1 zero emission race bike that is competing to win the International Formula 75 TTXGP Championship.

If you beat other engineers, win the competition and your design rocks then the triple clamp you designed will help the lightweight heavy hitter tear up the tarmac already in June in the first race of the series. You get the bragging rights and an iPad 2 as the prize for your efforts.

The requirements for the triple clamp?

  • Rigidity and low weight are of paramount concern. This is a racing bike!
  • Design must incorporate Amarok Paw brand symbol in raised or relief somewhere on the top surface.
  • Must be manufacturable by CNC in 6061 aluminium billet.
  • M6 pinch bolts are used (and required) to clamp the tubes.
  • Must be one part.
  • May be Annodized.

More details in this PDF description of the challenge (ver 2), download the Paw brand symbol. More images of the bike can be found in the Amarok P1 gallery.

Click image for a larger version.

Click image for a larger version.

Details of the current triple clamp

The elevated profile is not ideal and not required. M6 pinch bolts are used (and required) to clamp the tubes. The new version may be solid, or incorporate lightening holes or stiffening channels - it’s up to you to come up with the lightest, stiffest solution.

The Rules - How to participate?

  • The prize for the winner is a brand new iPad 2.
  • This competition is open to everyone.
  • You can participate with more than one model.
  • Only models uploaded to GrabCAD library participate in the competition.
  • Tag your model with "amarok" for searchability.
  • You can upload a private model but you need to share access to
  • Privately uploaded and share models must be made public once the competition deadline is due.
  • All CAD software is welcome but you must upload a STEP/IGES file too.
  • Models not meeting the requirements (see above) will not participate.
  • Competition start on May 18, 2011.
  • Competition ends on June 1, 2011.
  • The winner will be selected by a joint jury of Amarok Racing and GrabCAD and announced in GrabCAD’s blog.

The Prizes

Amarok Racing and GrabCAD will pick the winner of the competition and two runner-ups on June 3, 2011 and announce them here, on our blog.

  • 1st prize - iPad 2, crew tshirt, Amarok poster, and get to be featured on Amarok Racing website.
  • 2nd prize - Amarok crew tshirt, poster
  • 3rd prize - Amarok poster

More about Amarok Racing and TTXGP

The goal of Amarok Racing is to compete in and win in the North American Championship of the formula 75 class in 2011. To that end the team has designed and built a ground-up, all new, radically engineered electric racing superbike that changes the paradigm in the industry, in power-to-weight.

TTXGP is the world’s first zero emissions, all electric racing series for motorcycles, pitting innovation, high technology and new thinking against the challenges of high performance, efficient mobility.

GrabCAD is proud to help Amarok Racing to achieve this goal by pooling the collective knowledge and skills of over 4000 engineers.

By the way Amarok is the Inuit word for wolf, hence the paw logo.

  • Scott Bruins

    Very cool, I love electric vehicles (the fast kind). This should be a fun project! One quick request, could we get the Amorak logo as a vector image or DXF?

  • Robert Harvey

    This sounds pretty awesome! are there any specs for deformation tolerances etc if I run fea on the part? & what sort of forces will occur on such components?

    Bet terry will get stuck in on this one!

  • Marijn

    are the mates on the drawing millimeters?

  • I have compiled a list of things that are required to design and engineer a triple tree along with the info already provided.
    1. Height of neck from ground to bottom of neck.
    2. Rake angle of neck in the frame.
    3. Trail requirements (I assume 5″/127mm to 8″/203mm).
    4. Distance from bottom surface of bottom neck bearing to the top surface of the top neck bearing (space between top and bottom trees).
    5. Horizontal distance from bottom of neck to the center of the rear wheel (needed to calculate dive angle).
    In some cases depending on the rake of the neck and the trail used in the design, it might require a D-Rake tree assembly. If this is the case then the top tree and the bottom tree must be designed together to insure proper alignment.

    Please email me the needed info list above and I can engineer a triple tree assembly for you.

  • greg

    Looks like a great competition – I’ll be giving it a shot.

    Just one question about the geometry… Are you sure about some of those dimensions? Specifically, I don’t think you mean R41 for the fork upper clamps? Surely this should be a diameter? And 300 between centers seems odd too…

  • Rick Mason

    Can you please post a larger copy of the ‘PAW’ logo somewhere on the site for use on the triple-clamp design? A vector copy (eg .dxf) would be handy, to save retracing it!!

  • Daniel Castillo B.

    I think this planes are bad. the small hole have 26mm(Radius)in the top view dont have coherence with the lateral view.

    what do u think?

  • Scott, Rick – Logo coming soon.

    Marijn – Correct, millimeters. Amarok Racing is a Canadian company.

    Robert, Terry, Greg – We’ll try to someone from Amarok come in and answer those questions. Any and all information will be posted here and everyone has the same data and specs to design from.

  • Please note I added one point to the requirements – you can upload the model as private but you have to share access to and once the competition deadline swooshes by you have to make your model public.

  • After looking at the current design of the front-end, I see that you have used a girder design for the forks and shock mounted in frame just behind the pivot (neck stem). Very cool!
    I see why now you didn’t need to give use the other info I requested because it is all done in the girder.
    I see now the top tree is mainly a steering apparatus.

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  • Hell yeah count me in!

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  • Dear all

    Forces / Structural Needs

    This is a part of a completely UNCONVENTIONAL front suspension assembly, and does not use traditional telescopic forks. As a result, the forces acting on this part are only those created by the inputs of the riders arms. No suspension forces act on the part at all. For reference, this system is called a Hossack type, BMW market it as “Duolever”.

  • Neck Height / Total dimensions

    As this is only a steering linkage, and there is ample room in nearly all directions, there is a lot of room for design and interpretation.

    Minimum wall thickness should be 4, unless walls are tapered and not too large in area. Again, this is not a part that needs to withstand great torsional loads, so ever 4 is a very generous value.

    This is a competition, and we are encouraging technicians and designers to express original thinking.

  • Rick Mason

    It would be interesting to see a graphic showing the weight (mass) of the various entries as they are reviewed – anything over 1000g is probably a waste of time, but about 6 hours’ machining time should produce a viable part of around 800g …

  • Rick Mason

    Keep in mind that when a bike is involved in a collision or crashes, a LOT of dynamic load is exerted on the bars/grips/clamps. Although normal steering loads are low, the part needs to be sufficiently strong to resist crash loads without fracture etc.

  • Slothrop

    Are the dimensions marked R really radii? Did you mean diameter?

  • Scott Bruins

    Should the radii (R26, R41) be diameters? In the front view there is a 50 which I believe is a counter bore diameter centered on the R26 based on the drawing. Otherwise the minor diameter would be 52 and larger than the counter bore? Its a little hard to explain I would just like to confirm that dimensions are indeed radii not diameters.


  • Crash Loads

    This is a part for a racing motorcycle prototype, so crash protection is not something that matters. In motorcycle racing, bikes fall, get bent, and get rebuilt. WInning is paramount and that means low weight. Obviously the part needs to be stiff and strong enough to support itself and the riders shoulders, but nothing more.

  • Details updated:

    * New and more accurate drawings.
    * New PDF (basically same up to date info).

    Logo still to come.

  • JOE

    Since weight and strength are an issue and it is for racing does it have to be limited to 6061 aluminum? There are other lighter stronger options titanium /magnesium are a few that come to mind

  • JOE

    Also I see you are using clamp on grips, is it acceptable to incorporate the down tubes into the triple clamp and make it as one unit.

  • RocketNut

    What is a triple clamp?

  • Scott Bruins

    How will the strength/rigidity of the part be determined when judging? Will there be a structural analysis done on each part or will it be determined based on appearance?

  • Nolton

    It is a coal burner! Not zero emission. How about disposal of the batteries?

  • Rick Mason

    One important question that we have overlooked – is the diagram 1st or 3rd-angle projection? I had ASSumed 3rd.

  • gee


  • Chanson

    Can we see the design intention that determines why those surfaces must remain planar? It will help with my creative process…

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  • Chanson


    In addition to my previous question, could you please specify how the entries will be judged? I am going through a couple revisions and can great a light part, but they’re not very pretty. Is the number one focus here weight reduction? If you could give some rankings, such as Needs/Wants/Nice to Haves, that would be extremely helpful. Thanks!


  • Azim

    So we have till june 1 :)

  • Robert

    Can the steering linkage attach to the triple clamp with bolts from the inside instead of outside? If so, what is the interior face to face dimension to use for the triple clamp to allow the linkage to fit. I assume the linkage will never collapse enough to rotate above horizontal.
    Is a .dxf of the Amarok logo avaiable?

  • Azim

    I have few questions:
    1) If you look at the existing clamp the bigger hole is on the top, but so far everyone seems to have the bigger hole at the bottom of their model. So which is right?
    2) If you look at the pdf file in the third last page, it says: must be manufactured in CNC. So, does that mean for the model to be accepted it can’t have any crazy shape that can’t be manufactured using a CNC? (And by CNC do u mean just milling or laser cutter?)

  • gee

    i also have a same perception as azim. does the 50 dia. hole indicate the clearance for the nut as shown on the picture or there’s another 50mm profile which is unseen on the picture. because on the dwg i assumed the 26 mm hole is on the top & the 50 is on the bottom side…& beside that it will makes different profile if you read it as first angle or third angle projection..^_^

  • Mike

    If this clamp is to be manufacturable, should I include the NC, and in my case, a Mastercam part file?

  • Mike

    What CAM software is being used to machine this?

  • Stelu HARSAN

    I have a question: what displacement it is allowed, supposing a possible correct chosen worst case, at the far end of the handle bar? Even though the material yield strength is quite high, when the stress reaches 120MPa the displacement is 1.8mm (in my case). Thanks!

  • We did not want to put too many restraints for you guys. As said before, we want you to figure it all out. The critical things are the dimensions found on the reference drawings, everything else is up to you. Yes the clamp has to withstand the loads of the driver (nothing more). Yes the piece will be machined with 3-axis mill from aluminum (feel free to go crazy, but the machining should be done in less than a year:), the race is in mid June). We’ll decide the winner based on looks/weight/manufacturability and probably run the top 5 through a simple simulation to be sure they will not brake falling off the table.

  • Drawing is misleading, I am tracing over this file in SW and its so badly labeled I don’t know where to start my constructive criticism. I can barely believe that the rest of the bike got built based on the ambiguity of the drawings they have provided here…
    Moving forward with the design even though it is labeled incorrectly.. see image here for my trace over in Solidworks

  • Stelu HARSAN

    I would run first the simulation and leave the looks at last :) Thanks again for your reply. Cheers!


    Triple Clamp

    Often erroneously called a “top yoke”, this solid part, typically cast in aluminum or steel (on low cost motorcycles), is a bridge that connects the two vertical stansions of the telescopic front forks, and the central steering pivot. In traditional applications, it is a highly stressed, fully structural part on which the total loads exerted on the front wheel (anything from 40% to 100% of total vehicle mass + inertia, depending on conditions).

    Amarok P1 Triple Clamp

    On the P1, the triple clamp has largely similar functions, with one KEY EXCEPTION : it DOES NOT take loads of the vehicle, only the rider. The entire front wheel, suspension system and its mass and related forces are directed through other parts, leaving the triple clamp free to perform one role : direct rider steering inputs into the steering linkages (connected to the M6 threaded holes in the 75mm “block” at the front), and support the rider’s upper body under severe braking.

  • 50mm Diameter Hole

    Has no direct function, other than to allow clearance for another component. 50m allows generous clearance.

    CNC Machining

    The part will be manufactured and tested on the P1, once or twice at the most. As a result, CNC requirements means that manufacturing cost is not a vital as weight savings. Laser / water jet cutting is permitted, but adding additional steps to manufacture better be justified in a great design

  • JOE

    The use of clip-on handlebars is purely for ergonomic fine tuning, using well proven and easily available standard parts. The P1 is very far from optimized, but for our test schedule we will continue to use this solution. So no, you cannot integrate the grips, ‘bars, etc.


    The P1 and all TTXGP bikes are zero emission, AT THE VEHICLE. Which ever side of the fence you sit on regarding electric vehicles, be it supporter or detractor, certain facts remain indisputable :

    -An electric drive has fewer, precision made moving parts, by an order of magnitude.

    -Operating an EV produces virtually no detectable emissions versus a fossil fuel burning one, be it heat, EM, and zero carbon pollutants.

    Surely an engineer can see that converting coal (as you say) into electricity on a mass, power station scale is infinitely more efficient than burning gasoline in a small internal combustion engine, which wastes 75% of that energy transforming it into waste heat?

  • Nick

    Whatever happened to getting a (vector) copy of the logo?

  • Thanks for the 3-axis directive. That is reasonably large constraint, and would be painful to be judged on it without knowing. ok, back to work.

  • David

    Hello Michael & Indrek
    Since most of us are using software that can do FEA can you tell us what would be your applied force for the worst case senario & what is the safety factor you want to use with aluminium or what is the maximum MPA you don’t want to go over.
    I know that a motorcycle can’t generate more than 1G foward while hard braking (I did the test whith a CBR1000 and sensors for a study on a three wheeler) What would be your vertical maximum.

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  • Scott Bruins

    Since the 50mm is just clearance can we simply hollow out the bottom just have the 26mm hole?

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  • Scott Bruins

    Yes, the 50mm hole was a clearance reference, but if your part design does not come that low, it can be a hollow.

  • Outstanding example of Thinking Different.

    Best of luck to everybody and look forward to seeing your work at the track and hopefully beyond.

    Azhar Hussain

  • I just wanted to say that the whole Amarok-Agni team is very impressed with the quality, scope and effort we’re seeing in the competition so far. We’re really stoked by the results.

    Keep them coming in! There’s still time to shock and amaze us.

    Good Luck everybody!

    Michael Uhlarik, and the Amarok-Agni Racing Team

  • Michel Ellul

    Does the competition ends in the start or end of day of 1st June ?

  • I’m in, finally. This competition really turned out some great models, and it was fun to watch the ideas roll in.

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  • Nick

    Wow, I am glad I am not a judge. How many models are there? And no two alike!

  • Nick, over 100 models. It’s going to be tough sorting through and picking the top 10 that we run FEM calculations on. We’re quite blown away by the popularity of the contest.

  • Siim, Does the symbol have to be on the top surface. Just rechecked that. Mine is front visible surface. Please clarify for us.

  • Never mind Siim, I fixed it

  • Christopher Clark

    Hello Amarok team,

    I noticed that my model says that it was uploaded on June 2nd, but I certainly uploaded it before midnight, central time. I hope this is ok, and thanks for the contest!

  • Christopher – no worries, we saw it up before the deadline so it’s one of the entries.

  • Dragos

    hello Siim… i saw the post…that on monday will be the announcement of the amarok contest..but is there any way to post a top ten (only if it`s possible) because the suspense is killing me :) .. chears

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  • Robert Piaskowski

    what I would like to see

    is some one design a electric bike
    for people that do not have or will ever have drivers license

    can cover 120 km distance at quick speed at 32 km
    with the option of peddling and a choice of gears
    for easy peddling, and can be used all year long including winter

    and can use built on solar chips to recharge
    the bike when the bike is turned off

    one other thing an extra battery just in case
    the other run out and it’s only short distance
    left to go

    and with heating and cooling
    to keep the motor and rider at the right
    temperature which can be dun with a item called
    a vortex tube and all it needs is air pumped into it
    to make it work

    with better mirrors to see more around the rider

    that is what I want to see ;o)
    please send me your comments
    what ever they might be

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