eccsmk
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posted on 7/7/09 at 04:56 PM |
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F1 tyres
why do they run such large side walls??
where as touring cars run really low profile tyres??
slightly random but im sure someone on here will know
thank you
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clairetoo
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posted on 7/7/09 at 04:57 PM |
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Cuz if the sidewalls were shorter , the tread wouldnt reach the floor ?
Its cuz I is blond , innit
Claire xx
Will weld for food......
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designer
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posted on 7/7/09 at 05:08 PM |
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For some reason the aspect ratio of F1 tyres is set by the regulations.
No idea why, but probably introduced when Tyrell did the six wheeler.
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omega0684
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posted on 7/7/09 at 05:12 PM |
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i would imagine it has something to do with the ride height of the car, if an f1 cars tyres were any lower the belly of the car would be scraping the
floor
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speedyxjs
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posted on 7/7/09 at 05:22 PM |
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quote: Originally posted by omega0684
i would imagine it has something to do with the ride height of the car, if an f1 cars tyres were any lower the belly of the car would be scraping the
floor
No 'cos the wheels would be made bigger. I think it is to do with the spring in the tyre. We all know how hard suspension they run. Now imagine
if there was virtually no flex in the tyre wall
How long can i resist the temptation to drop a V8 in?
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Steve G
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posted on 7/7/09 at 05:25 PM |
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The rules state the wheels must be 13" (and they wont increase that as it limits the brakes) so they have to run those profiles really.
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russbost
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posted on 7/7/09 at 05:31 PM |
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The profiles are actually very low, the tyres are something like 335/35's. The reason the sidewalls seem so big is simply a function of the
width of the tyre, 35% of 335 is just under 120mm, or nearly 5" in old money.
Touring car tyres are only about 8 or 9", say 245/35's so 35% is only 86mm, or about 3 & 1/2 ".
Nothing to do with scraping the belly as that would change in the design phase etc, changing ride height is a very mundane excersize in the high spec
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scudderfish
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posted on 7/7/09 at 05:58 PM |
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I thought it was because about half the suspension travel is in the sidewall.
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200mph
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posted on 7/7/09 at 06:02 PM |
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quote: Originally posted by scudderfish
I thought it was because about half the suspension travel is in the sidewall.
trying to recall an explanation given by Martin Brundle and they slo-mo'd the car so you could see how much the tyre deformed over bumps etc.
Pretty sure he said a large function of the 'high' tyres was shock absorbance
If it isn't broke, fix it until it is
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brianthemagical
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posted on 7/7/09 at 06:42 PM |
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Regulations govern a 13" rim, speed of vehicle and consequent rotational speed of wheel give some factors. Bigger tyres have bigger contact
patch, more compliance. The only reason there's so much chassis movement from the tyres is because of the tyre, not the tyre be designed as
such, and the spring rates being so high due to areo loads.
Most sutible vehicle runs 13's, from F1, through F Ford, to small tin tops, it's just a good comprimise in brake size, weight and
handling/feel.
Other cars user bigger wheels for looks. Mainly 17's, big, high class cars with 13's would look gash. 17" is a similar senario, in
that it is set as a standard and most other forms of motorsport use them as the tyres are already developed.
[Edited on 7/7/09 by brianthemagical]
[Edited on 12/7/09 by brianthemagical]
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balidey
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posted on 7/7/09 at 07:17 PM |
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Why do touring cars has small tyre walls?
Go to the next BTCC round, look at the pretty cars going fast. now look in the car park. See all the people who have 'race tuned' their
cars? Scraping the floor, wheels tucked up under the arches, rubber band tyres, oversized wheels?
Manufacturers can sell this tosh to the people that think thats 'tuning'
try selling 60 profile tyres on 13" wheels to the trevs in Halfords.
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Stuart_B
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posted on 7/7/09 at 07:19 PM |
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there is some good info there.
stuart
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balidey
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posted on 7/7/09 at 07:27 PM |
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also, F1 is dictated by sponsorship revenue.
Look how much more area you have on a large tyre sidewall for the manufacturers logo.
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clbarclay
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posted on 12/7/09 at 12:27 PM |
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quote: Originally posted by 200mph
quote: Originally posted by scudderfish
I thought it was because about half the suspension travel is in the sidewall.
trying to recall an explanation given by Martin Brundle and they slo-mo'd the car so you could see how much the tyre deformed over bumps etc.
Pretty sure he said a large function of the 'high' tyres was shock absorbance
That goes for any tyred vehicle. A fairly basic tool for mathematically analysing car suspension is the Quarter vehicle model, which obviously looks
at one corner of the vehicle in isolation.
This comprises of 2 masses, representing the 'sprung' and 'unsprung' weights. The unsprung weight is still connected to the
ground by a spring and damper (remember this is mathematical not physical) which represent the stiffness and energy absorbing properties of the tyre.
There is then a second spring and damper between the sprung and unsprung weight representing the cars physical spring and damper.
Similar to this, but the model I've used included a damper between the unsprung weight and ground
What F1 teams use to model and predict suspesnion I don't know, but at the leavel ther are dealing with a simple spring and damper is a gross
simplification of the complex properties of tyres.
[Edited on 12/7/09 by clbarclay]
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eccsmk
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posted on 12/7/09 at 05:44 PM |
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wow some really in depth answers
i have a much better idea now
thank you all for your responces
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