Tire profile vs tire performance

[Ray]

I can never remember the formula, but assuming that for highest grip,
the teams fit the biggest wheels allowed, that would mean a rolling
diameter of 660mm, with 355mm wide wheels at the front and 380mm wide
wheels at the back. The front tyre tread width may not exceed 270mm. I'm
actually struggling to find the rule that sets the size of the rims, but
I thought they were 13". It must be in the regulations somewhere but for
some reason it's eluding me today.

found the rules:
http://www.fia.com/sport/Regulations/f1regs.html

the max size allowed is a 460mm wide rear tire that can't be taller than
710mm.

that size of a tire on various wheels:
13" - 460/40-13
14" - 460/38-14
15" - 460/35-15
16" - 460/33-16
17" - 460/30-17

so, even if they're running a 13" wheel, that's only a 40 aspect tire,
which I believe is a low profile tire.

Ray

 

[Phil Newnham]

I can never remember the formula, but assuming that for highest grip,
the teams fit the biggest wheels allowed, that would mean a rolling
diameter of 660mm, with 355mm wide wheels at the front and 380mm wide
wheels at the back. The front tyre tread width may not exceed 270mm.

HAAHAHHAHAAHAHHAAAHAHAHAHHHHAAAAAHAAHAHAHA ...hee [cough]

I knew you'd like that one.

 

[y_p_w]

I can never remember the formula, but assuming that for highest grip,
the teams fit the biggest wheels allowed, that would mean a rolling
diameter of 660mm, with 355mm wide wheels at the front and 380mm wide
wheels at the back. The front tyre tread width may not exceed 270mm. I'm
actually struggling to find the rule that sets the size of the rims, but
I thought they were 13". It must be in the regulations somewhere but for
some reason it's eluding me today.

It's now about 14". From the 2008 rules:

12.4.4 Wheel bead diameter must lie between 354mm and 358mm.

** **

I downloaded the 2004 rules, and it was around 13" then:

12.4.4 Wheel bead diameter must lie between 328 and 332mm.

 

[y_p_w]

It's now about 14". From the 2008 rules:

12.4.4 Wheel bead diameter must lie between 354mm and 358mm.

** **

I downloaded the 2004 rules, and it was around 13" then:

12.4.4 Wheel bead diameter must lie between 328 and 332mm.

Just as a clarification, About 14" is for 2008. The 2006 and 2007
rules on rim height (bead diameter) are the same as 2004. I didn't
look up 2005, but I suspect it's the same.

 

[Body Roll]

found the rules:
http://www.fia.com/sport/Regulations/f1regs.html

What the heck are the "exteme weather tyres" (as opposed to dry and
wet weather tires).
of which you potentially need 3 sets? Do they have F1 races during
snowstorms or something?
Would be fun to watch that "F1 gone rally" event :-]

Note that they require homegenious compounds in all three types:
no pumice impregnated center rib for Mikka Hakkinen!

the max size allowed is a 460mm wide rear tire that can't be taller than
710mm.

that size of a tire on various wheels:
13" - 460/40-13
14" - 460/38-14
15" - 460/35-15
16" - 460/33-16
17" - 460/30-17

so, even if they're running a 13" wheel, that's only a 40 aspect tire,
which I believe is a low profile tire.

That settles my grievance then.

 

[Body Roll]

found the rules:
http://www.fia.com/sport/Regulations/f1regs.html

Thanks. Did you see the pictures of "extreme weather" F1 tires
anywhere?
Are they slicks or there is some grooves for water evacuation?
I wonder how different they are from "wet weather tires".

 

[Rick Courtright]

for max performance summer tires I'd define it as "grips tenaciously
to the wet pavement at the temperatures above 45F"

Hi,

This is a "summer" tire? What kinda summer weather do you guys have
where you are?

Rick

 

[y_p_w]

Body Roll wrote:




Hi,

This is a "summer" tire? What kinda summer weather do you guys have
where you are?

To be fair, I think the meaning is for the traditional
"3-season tire" that is somewhat incorrectly refererred
to as a "summer tire".

 

[CompUser]

...'Why aren't anyone using square tires?'

It's tough to take a question like that
seriously--particularly from a nick like
"bodyroll".

 

[Phil Newnham]

found the rules:
http://www.fia.com/sport/Regulations/f1regs.html

What the heck are the "exteme weather tyres" (as opposed to dry and
wet weather tires).
of which you potentially need 3 sets? Do they have F1 races during
snowstorms or something?
Would be fun to watch that "F1 gone rally" event :-]

Typically, dry weather tyres are used until the drivers are unable to
get the power down or turn in, whichever becomes a problem first, then
they change onto wet weather tyres (often termed "intermediates"). If
there is significant standing water on the track, the intermediates will
suffer from aquaplaning, and extreme weather tyres (often termed "full
wets") are used. In 2007, the teams are limited to 14 sets of dry tyres,
4 sets of wets and 3 sets of extreme weather tyres per car per weekend.
There are also limitations on the number of sets that can be used in the
first two practice sessions.

 

[a_Frank]

I can never remember the formula, but assuming that for highest grip,
the teams fit the biggest wheels allowed, that would mean a rolling
diameter of 660mm, with 355mm wide wheels at the front and 380mm wide
wheels at the back. The front tyre tread width may not exceed 270mm. I'm
actually struggling to find the rule that sets the size of the rims, but
I thought they were 13". It must be in the regulations somewhere but for
some reason it's eluding me today.

IIRCC, the rim size is not regulated, just the diameter of the tyre,
when fitted to the wheel. Since the width of the tyre dictates the
ideal aspect ratio for the wall height, all of them would end up with
roughly the same rim size.

 

[Phil Newnham]

IIRCC, the rim size is not regulated, just the diameter of the tyre,
when fitted to the wheel. Since the width of the tyre dictates the
ideal aspect ratio for the wall height, all of them would end up with
roughly the same rim size.

If you read the whole thread you'll see that the bead diameter is
regulated, and hence the diameter of the rim must be more or less the
same as the bead diameter, give or take.

 

[news]

Thanks. Did you see the pictures of "extreme weather" F1 tires
anywhere?
Are they slicks or there is some grooves for water evacuation?
I wonder how different they are from "wet weather tires".

no, but your comment about an F1 race in the snow made me chuckle.

 

[news]

If you read the whole thread you'll see that the bead diameter is
regulated, and hence the diameter of the rim must be more or less the
same as the bead diameter, give or take.

If it's a 14" diameter wheel that the tire requires, you're going to
have a hard time fitting any other wheel on that. I'm assuming the
suppliers of tires have a list of possible sizes.

Ray

 

[Not Bernie Ecclestone]

no, but your comment about an F1 race in the snow made me chuckle.

I wasn't in the country at the time and my memory is a bit hazy after
all these years but sometime in the late 70's / early 80's an F1 car
went out for a few exploratory laps around Brands Hatch when there
was snow on the ground, possibly around April time if I recall.

<scratches head>

It might have been the aborted Race of Champions in 1982 or possibly a
Gunnar Nilsson memorial.


--

 

[Mario]

I wasn't in the country at the time and my memory is a bit hazy after
all these years but sometime in the late 70's / early 80's an F1 car
went out for a few exploratory laps around Brands Hatch when there
was snow on the ground, possibly around April time if I recall.

<scratches head>

It might have been the aborted Race of Champions in 1982 or possibly a
Gunnar Nilsson memorial.

I was at Montreal when it snowed the weekend of an F1 race. I'm not sure what
year it was, perhaps 1980?

Montreal can be odd even in June. Sometimes it's rained heavily at the hairpin
while being dry as a bone at the opposite end of the circuit.

 

[Silent Observer]

Body Roll wrote:

no, but your comment about an F1 race in the snow made me chuckle.

A truly international race..... the Antarctic Gran Prix. Black tie attire
required for all spectators ;=)

 

[Not Bernie Ecclestone]

I was at Montreal when it snowed the weekend of an F1 race. I'm not sure what
year it was, perhaps 1980?

Montreal can be odd even in June. Sometimes it's rained heavily at the hairpin
while being dry as a bone at the opposite end of the circuit.

Just like Silverstone or Spa most years. I've been at a race during
the summer either in the UK or Europe where there were hailstones an
inch or more deep on the ground, again my intermittent memory doesn't
recall where right now!


--

 

[vic]

I think it was 1979

Just like Silverstone or Spa most years. I've been at a race during
the summer either in the UK or Europe where there were hailstones an
inch or more deep on the ground, again my intermittent memory doesn't
recall where right now!


--

 

[Mario]

I think it was 1979

Here's a treat. It's Google Video of the BBC coverage for the Montreal Grand
Prix from 1985.

Murray Walker / James Hunt

35 minutes of good fun with drivers of legendary time.

http://video.google.ca/videoplay?docid=2527303899278312594&q=f1+1985