Bigger wheels, low profile tyres

Bigger wheels, low profile tyres

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Original Poster:

1,655 posts

153 months

Tuesday 8th April 2014
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Whats the deal, i caught the back end of a discussion on swapping to these big wheels again, any news stories?

Mikey G

4,764 posts

246 months

Tuesday 8th April 2014
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18's would look awful IMO, would change the characteristics of the suspension too. To big a jump, stick to the same or just go up an inch or 2 max.

anonymous-user

60 months

Wednesday 9th April 2014
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Mikey G said:
18's would look awful IMO, would change the characteristics of the suspension too. To big a jump, stick to the same or just go up an inch or 2 max.

Personally I think it would look rather good:


thegreenhell

16,788 posts

225 months

Wednesday 9th April 2014
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This is what 18s would look like with the same tyre diameter on this year's car




BritishRacinGrin

25,139 posts

166 months

Wednesday 9th April 2014
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They'll do it, and they'll do it on the premise that an 18" tyre, albeit a slick which lasts about 100km, is somehow 'more relevant to road cars' than the current size.
The required changes to the suspension will be drastic.

Megaflow

9,799 posts

231 months

Wednesday 9th April 2014
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If they do it, it will be an end to overtaking under brakes, they can pull 5G under braking today, I genuinely fear for the drivers how fast they will be able to stop with brakes scaled up to suit 18" wheels.

Exige77

6,522 posts

197 months

Wednesday 9th April 2014
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Megaflow said:
If they do it, it will be an end to overtaking under brakes, they can pull 5G under braking today, I genuinely fear for the drivers how fast they will be able to stop with brakes scaled up to suit 18" wheels.

Won't make any difference.

The brakes are already powerful enough to lock the wheels.

The limiting factor is the tyre grip available (both compound grip and downforce)

s3fella

10,524 posts

193 months

Wednesday 9th April 2014
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Less heat management issues though so ultimately it would potentially improve braking as could run softer tyres less affected by the heat from wheel and hub etc?

Fire99

9,844 posts

235 months

Wednesday 9th April 2014
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BritishRacinGrin said:
They'll do it, and they'll do it on the premise that an 18" tyre, albeit a slick which lasts about 100km, is somehow 'more relevant to road cars' than the current size.
Yup

Some Gump

12,833 posts

192 months

Wednesday 9th April 2014
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Put 15's on a caterham, and you completely ruin it. I can only imagine what it would do to an f1 car...

P-Jay

10,737 posts

197 months

Wednesday 9th April 2014
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Gaz. said:
I think Michelin wanted F1 to move to 18 inch wheels if it was going to supply to F1.
As with most things F1 I take the 'official line' with a bucket of salt. I've heard it's to limit brakes, but as some have already said they've managed to pack more than enough braking power in to the space they have now.

I've always assumed the tyre makers wanted the maximum amount of "advertising real-estate" so I would be surprised if Michelin would have pushed to give up all theirs in favour of OZ's.

If they did change it, it would have to be between seasons, as under the current regs the tyres form part of the suspension.

PhillipM

6,529 posts

195 months

Wednesday 9th April 2014
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s3fella said:
Less heat management issues though so ultimately it would potentially improve braking as could run softer tyres less affected by the heat from wheel and hub etc?
No.

skinny

5,269 posts

241 months

Wednesday 9th April 2014
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chavtastic.

i thought the tyre manufacturers preferred the larger sidewalls as it made their sidewalls bigger for advertising?

Scuffers

20,887 posts

280 months

Wednesday 9th April 2014
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Some Gump said:
Put 15's on a caterham, and you completely ruin it. I can only imagine what it would do to an f1 car...
Considering they run ACB10 crossly, not that supposing a change in wheel and to radials is going tommake a difference!

Does not make it wrong, just needs the suspension change to suit.

F1 on 13" rimms is laughable these days...

tristancliffe

357 posts

219 months

Wednesday 9th April 2014
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There are almost no cars ever made that look or handle better on anything bigger than 14" wheels. Current trends for >17" wheels look awful and ruin handling and ride.

Scuffers

20,887 posts

280 months

Wednesday 9th April 2014
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tristancliffe said:
There are almost no cars ever made that look or handle better on anything bigger than 14" wheels. Current trends for >17" wheels look awful and ruin handling and ride.
So, no .GT cars run 18" wheels?

Yes, right.

Some Gump

12,833 posts

192 months

Wednesday 9th April 2014
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Scuffers, is there anything you're not an expert on?

As per usual, you're talking ste. Very few caterhams run acb10's - the superlight r came with them, but most people racing use cr500, zzr, or whatever low spec avon radial is dictated by the academy series these days. Oh sorry, the sprint / hillclimb mob tend to favour the kuhmo v70 soft.
Obviously if people were to move from one to the other, they would change the setup. Thats why there are 2 sets of de dion ears.

Anyways, When f1 engineers had free reign of wheel size, they were going smaller not larger. F1 on 13's is not laughable, it's logical - they are the rit apecification for the application.

Scuffers

20,887 posts

280 months

Wednesday 9th April 2014
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you don't have to be an expert to look at just about any tyre makers listings and see that just about *ALL* GT tyres are 18" and have been for several years now (to the point that getting 16 and 17" ones is becoming increasingly hard).

as for Caterhams, if you want to race one, ACB10's are still the best tyre out there for them, just because somebody has done a tyre deal to run XYZ does not make them the best tyre available (see Pirelli in F1 for details!)

F1 run 13" because it has done for years, no other reason

From a chassis perspective they would love to run lower profile tyres than the suspension could do the majority of the job instead of the tyre (acting like an un-damped spring - hence J-dampers and mass dampers etc)

Look, this is not hard stuff, the info is out there, your just being blind/dumb

Crafty_

13,431 posts

206 months

Wednesday 9th April 2014
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Some Gump said:
Scuffers, is there anything you're not an expert on?

As per usual, you're talking ste. Very few caterhams run acb10's - the superlight r came with them, but most people racing use cr500, zzr, or whatever low spec avon radial is dictated by the academy series these days. Oh sorry, the sprint / hillclimb mob tend to favour the kuhmo v70 soft.
Obviously if people were to move from one to the other, they would change the setup. Thats why there are 2 sets of de dion ears.

Anyways, When f1 engineers had free reign of wheel size, they were going smaller not larger. F1 on 13's is not laughable, it's logical - they are the rit apecification for the application.
Whilst I quite often don't agree with Scuffers the assertion that every car handles better on 14" wheels is rather simplistic isn't it ?

Barring caterhams and F1 I'm struggling to think of any racing car that uses 14" or below.

Some Gump

12,833 posts

192 months

Wednesday 9th April 2014
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So why do formula 3, 3000, renault, and various hillclimb cars not run 18's instead?
You need the compliance in the sidewall to be able to carry curbs etc, and there is no advantage to having larger brake capacity like there is for endurance racing.

Face it, the only people calling for massive rims are the marketing people. F1 engineers are not asking for it, at all.