Ducati Hypermotard and the like.... - Wrist Twisters
 
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post #1 of 16 Old 08-06-2008, 10:03 PM Thread Starter
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Ducati Hypermotard and the like....

Seems to me there are more and more of these dirt bike looking sport bikes on the market....my question is why? Am I missing something? Can you put a set of dirtbike tires on them and take them off road?



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post #2 of 16 Old 08-06-2008, 10:14 PM
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I don't get it either

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post #3 of 16 Old 08-07-2008, 04:20 AM
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try it. Find someone who'll let you rip around on their motard. You're seeing more of them because people are figuring out just how much fun they are.

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post #4 of 16 Old 08-07-2008, 04:59 AM
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Quote:
Originally Posted by 919jockey View Post
Seems to me there are more and more of these dirt bike looking sport bikes on the market....my question is why? Am I missing something? Can you put a set of dirtbike tires on them and take them off road?


Moreso, people are taking dirtbikes and putting street tires on them and finding out they rip on track or thru the twisties. Decent power, no ground clearance problems, light weight and good suspension make for a backroad vehicle that can be tough to contend with. The manufacturers are just creating them out of the box.

I ran my buddies 450 motard for a couple of sessions at Jennings. The thing was a hoot on that track.

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post #5 of 16 Old 08-07-2008, 05:33 AM
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i have 4 trackdays next month at Jennings on the KTM, can't wait to back it in setting up for turn 8 & 9.

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post #6 of 16 Old 08-07-2008, 05:48 AM
 
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Quote:
Originally Posted by 919jockey View Post
Seems to me there are more and more of these dirt bike looking sport bikes on the market....my question is why? Am I missing something? Can you put a set of dirtbike tires on them and take them off road?


Yep, your missing out quite a bit ! Fun,fun, fun ! Your get all the rush of going flat out on a big bike, but, your on a smaller bike . 100 on a Super Motard feels like going 160 on a bigger bike - Should you ever get the chnace to try one of these styled bikes out, go for it !

As a matter fo fact, Ducatis demo fleet is going to be in Greensboro, NC tis weekend, so, Im sure thye will have a stop somewhere close to you sometime -

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post #7 of 16 Old 08-07-2008, 05:59 AM
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Mmmmm Supermoto! My next bike most likely will be a Supermoto. Not to mention the engines have unlimited upgrade part available also! You can have it stroked, high comp piston and a big bore in it over night (provided you have all the parts in hand).

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post #8 of 16 Old 08-07-2008, 10:36 AM
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sexy beast attached....

Ducati Hyper Fighter
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post #9 of 16 Old 08-07-2008, 10:50 AM
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hmmm, looks a lot like the Tesi


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post #10 of 16 Old 08-07-2008, 03:54 PM
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mmmmmmmmm





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post #11 of 16 Old 08-07-2008, 05:21 PM
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Someone please explain the steering concept on display here HTF does it work?

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hmmm, looks a lot like the Tesi



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post #12 of 16 Old 08-07-2008, 07:58 PM
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It's really quite simple ... well ... okay, maybe not.

Quote:
2000TJ:
Someone please explain the steering concept on display here HTF does it work?
The tesi is a pretty much typical hub center steering setup with an added rake control.


The heart of the system is the hub, which holds the quite large front wheel bearings on the outside and the steering / torque link on the inside. The brake / steering flanges are made as one piece with the hub center, which is split in the center and cross bolted for ease of assembly.

The axle, which is keyed to the steering / torque link and the brake / rake link arm, is free to rotate in bearings in the end of the swingarm, transmitting braking force from the brake and steering flanges through the steering / torque link to the axle, to the brake / rake link arm to the frame. Brake dive is controlled by the position of the brake / rake link attachment to the frame.

Steering is controlled by the steering link attached to an arm bolted to the brake and steering flange at one end and the bellcrank actuated by links to the handlebars on the other. The wheel is free to pivot on the steering / torque link in one axis only. Think of the steering / torque link as a basic universal joint.

The swingarm has to be made comparatively wide to provide a modicum of steering lock, but there isn't very much.

There you have it.

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post #13 of 16 Old 08-07-2008, 08:02 PM
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Great explanation Rob, now the next question is WHY? What's the advantage of that setup?

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post #14 of 16 Old 08-07-2008, 08:12 PM
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Less dive under braking is one.

Yamaha even had one of these...


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post #15 of 16 Old 08-07-2008, 08:31 PM
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Better controlled brake dive, the ability to mount the engine closer to the front wheel (particularly important with the Ducati motor), and better suspension compliance under braking. There were complications due to the very high loadings on the steering / torque link under braking, offset loads into the chassis requiring a beefier main frame, the very limited steering lock, and the tendency to ground the swingarm during high lean angles, invariably causing a crash. Despite lots of effort on the part of ELF in 500 GP this was its greatest deficiency. That and nonlinear and somewhat vague steering feel from the various links in the system.

The RADD / Parker system used by Yamaha addressed some of these problems, but Yamaha built everything too heavy, something James Parker complained bitterly about during one of our conversations. He would have preferred a pure sportbike setup, which is, in fact, exactly what he gave them. But the lawyers got a hold of it, and the rest is a very short history.

Rob

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On the other hand, if it has not been done never assume it is impossible to do it.
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post #16 of 16 Old 08-08-2008, 05:39 AM
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Big ujoint with with a rubber tire wrapperd around one pair of ends... I do believe i've got it.

Thanks ROB

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