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Anonymous

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Simon Patterson  says:

MotoGP Argentina: Another clean sweep weekend for Marquez

Marc Marquez has ignited paddock speculation that he’s looking to complete the perfect year in MotoGP, as he makes it three from three to win easily in Argentina. The young Spaniard didn’t have the race all his own way, however, with a fierce battle in the opening stages seeing him back in seventh after a poor start, while Jorge Lorenzo cleared...

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  • Posted 147 days ago (27 April 2014 19:37)

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DeGrasse

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Aug 13

Posts: 2859

DeGrasse says:

Some action waiting for us at Jerez...

youtu.be/ttUiYGKiNvo

 

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CHRainmaker

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Jul 11

Posts: 1851

CHRainmaker says:

The GP7 and RC212V helped Casey..

 ..but seemingly not Loris or Andrew respectively..

 

..why is that? 

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DeGrasse

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Aug 13

Posts: 2859

DeGrasse says:

ElDiabolico

You believe wrong.

A tyre that slides doesn't heat up and work as much than when it is loaded and have to exchange grip (rubber) vs load, otherwise said traction, if you had ridden on corner speed to the limit you'd know it wears the tyres a lot, while sliding it isn't as hard on the rubber.

When the tyres slides the wheel spins faster for the same speed and the load/heat is distributed on a larger area of the tyre than when it doesn't.

Then there is the little matter of doing this at lean angles further away from the edge than when you ride on corner speed where you need to lean the bike to max angle to gain time at the apex.

On a 157 kg+ biker it matters a lot, especially because to ride this way, you also need a chassis with more weight on the rear wheel, which increases the load on the tyre at maximum lean and speed, tyre edges are the areas where there is the least rubber and what goes first when grip goes down.

The Honda is not having as much issues with the low grip, they can manage the traction better, the temperature differences between straights and full loads are not as important as is the case for the M1 and they work the tyres a little less on corner speed.

Yamaha had always had tyre longevity issues with the M1 since 2011 for these reasons, last year, Rossi issues with front tyre grip during braking was due to the difference of temperature between straight and load and time to heat up the tyres.

Lorenzo had more issues with rear grip longevity, Yamaha racing comments all seasons shows this very well.

ps. During the commentary made at the BBC studio one of the guys said exactly that, i believe he was a rider, not Corser but another one.

 

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saturn392

Joined:

Nov 03

Posts: 2154

saturn392 says:

Mornin' CHR

You ask ''why is that''  ...    It's because he's numb from the neck up! ...  boom boom !

Sorry my man but you left the door wide open !!

 

 

 

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revnev7

Joined:

Oct 11

Posts: 617

revnev7 says:

ALL HAIL THE NEW KING....

      I like MM,he remind`s me of CS,although,unlike MM he didn`t get the easiest ride to the Top. Never had the best bike`s,and in the day`s when Michelin decided who the World Champion was going to be,he never got the best tyre`s,not even the 2nd best,"C" grade was all he was ever allowed.Their "star",at the time, made sure of that. But MM has got that " will to win" at all cost,that Stoner possesed.And he also has one of the 4 best bike`s out there,{WORK`S}.with all the expertise that come`s with that title. Ofcourse,now that all the Work`s bike`s,have access to "exactly" the same tyre`s,the best rider/bike combination,on the day will probably win. { The way it should be }, but,sadly never was when Michelin ruled the roost. As is the case through-out the "entertainment" industry,many of the top guy`s at Michelin only had one candidate they wanted as World Champ,until he started slagging them off and demanding more. Well we all know what happened then,last race of 2006,"here you go petal,have a couple of Stoner`s tyre`s,see how you get on". And oop`s,he fell off,and gave the title to Mr.Hayden,shame.  So, to all you numpties who whinged about Bridgestone,would you like to go back to the old day`s, of special tyre`s for "the special boy"? 

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supermario

Joined:

Dec 09

Posts: 2491

supermario says:

So what you're saying ahab...

 

"You really do think all you need is a fast bike don't you. MotoGP pygmies"

 

...is that all those years VR won was because he was the best most talented rider. Yay or nay?

 

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Nostrodamus

Joined:

Mar 09

Posts: 5210

Nostrodamus says:

Well blow me down with a feather

Quasimoto might just have finally got something right about tyres generally speaking below. Although spinning on the fatter part of the tyre is still wearing the tyre more than plain driving. The dividend of course being if it is actually beneficial in turning / completing the corner.

Although I must temper this half right of Quasi's with a complete fail from last weeks Schwantz thread;

 To run a hard tyre, first you need to be able to get HEAT on it, you can start during braking by sliding it and steering the bike, and when it's the rear, it's obvious that you need to work it hard on the gas as well, as Rossi said, concentrate on making it work harder.

So the confused wee Frog (who once beat some fellow advanced institute of anal renentive riders at a Donny track day)  thinks you can generate heat in the rear tyre whilst it's skating lightly over the tarmac with next to no weight on it. Not to mention his crazed notion of the rear being the steering base point of all cornering. Quasi - I'll always love you for your comedic contradictions and sheer stupidty.

 

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ElDiabolico

Joined:

Jul 13

Posts: 348

ElDiabolico says:

de Grasse

No no no non...

Tire longevity depends on how close the temperature is to their operating window. Sliding less and of course producing abrasion which is related to normal tire use is absolutely within the desired working temperatures, rather than useless abrasion from sliding while having no grip.

You say:

"When the tyres slides the wheel spins faster for the same speed and the load/heat is distributed on a larger area of the tyre than when it doesn't."

Wrong, the rear wheel spins faster therefore at increased velocity compared to the current speed of the motorcycle. Therefore, the same area and not a larger area receives more heat.

In normal riding, you have a big percentage of adhesive wear (found between surfaces during frictional contact, caused by relative motion, direct contact and plastic deformation which create wear debris and material transfer from one surface to another) + abrasive wear. Being adhesive wear very mild.

Abrasive wear occurs when a hard rough surface slides across a softer surface, producing a loss of material that are forced against and move along a solid surface. The difference here is that during sliding you have to add surface fatigue by which the surface of a material is weakened by cyclic loading.

The only way to have less wear while sliding it will be because the corner becomes "shorter", as I mentioned before, you aim at the apex sooner and therefore you keep the bike leaned for shorter times... again it depends on the type of turn, relative speed, absolut speed, acceleration, type of compound, etc.

Think about it...

 

 

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Nostrodamus

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Mar 09

Posts: 5210

Nostrodamus says:

2001-2005

not in question Marion. Although there was certainly external connivance.

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CHRainmaker

Joined:

Jul 11

Posts: 1851

CHRainmaker says:

Saturn, you little tinker..

 ..for Octogenerian's like myself, It's tiring hearing the same old drivel about how Casey only won on the fastest bikes...In his time on the big bikes, he raced them all and beat them all - and despite words to the contrary, his debut season in Moto GP wasn't a bad one either, was it?..  

 

If he'd smiled at the fanboys a little more, the story would've been no doubt different!

 

How's the Hoff?..

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