F1 tire sizes in the 1950s

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woohoo
woohoo
7
Joined: 10 Aug 2008, 01:12

F1 tire sizes in the 1950s

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Gentemen,
A question to you all. Thirty years ago, Niki Lauda told us: "Take a trained monkey, place him into the cockpit and he is able to drive the car." Thirty years later Sebastian told us: "I had to start my car like a computer. It's very complicated." And Nico Rosberg said, "I pressed during the race...", I don't remember what race, "...the wrong button on the wheel". Question for you to all:

What were the tire sizes used in the 1950s?

I was looking at the sizes of the tires of the tires on the various cars of the 1950s and think that that tires changed a bit during that time, but my Googling has not found a specific size.
The Alfa Romeo of 1950 seems to have thinner tires than the 1951 car and the Ferrari 500 and 533 (one is two years after another seem to be different but then seem to be the same as the 1960s 1.5 litre spec cars.

The Ferrari website gives the wheel sizes (5.25 x 16 for front and 6.50 x 16 for rear) but not the tire height.

If possible, if some historian can tell me the sizes for the Alfa Romeo 158/9 of 1950 and 1951 and the Ferrari 500, 533 and 156 (which I know is from 1961) I would be very grateful. :)

Many thanks in advance
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Hoffman900
Hoffman900
220
Joined: 13 Oct 2019, 03:02

Re: F1 tire sizes in the 1950s

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From deep in the depths of the internet:
Seen at Goodwood:

Alfa Type 159 - Front - 5.50x17, Rear 7.00 x 17
Maserati 4CLT - Front - 5.50 x 16, Rear 6.50 x 16
Barry, a bit of information, from the Profile booklet, written by David Hodges, on the Alfa158/159.

It quotes the tyre details as "Pirelli; front, 5.50 x 17 or 5.50 x 18; rear, 7.00 x 18 or 7.00 x 19 (nominal sizes)"

Farnborough
Farnborough
124
Joined: 18 Mar 2023, 14:15

Re: F1 tire sizes in the 1950s

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This company works in supply across era, they may hold information pertinent to that era.

https://www.longstonetyres.co.uk/

Dougal, I believe is the person to whom you could speak :D

saviour stivala
saviour stivala
53
Joined: 25 Apr 2018, 12:54

Re: F1 tire sizes in the 1950s

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''F1 tire sizes in the 1950 are listed as 5.50-16 front and rear and suppliers as Dunlop, Pirelli, Englebert and Firestone. The Alfa Romeo 158 was in 1950, the 159 was in 1951.

Tommy Cookers
Tommy Cookers
650
Joined: 17 Feb 2012, 16:55

Re: F1 tire sizes in the 1950s

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skinny tyres in 1950s F1 eg .....
Harry Schell's 1100cc Cooper-JAP in the 1950 Monaco GP 4.00" or 4.25" front 5.00" rear

also skinny-tyred in F1 ....
Cisitalia D46 into 1950s
1926 GP Delage & 1930s E.R.A. c.1948
fwd thing with a 750cc supercharged Panhard engine in 1954

then in later 50s .....
Lotus 12 & 16
rear-engined ....
Coopers
Lotus 18 1960 (used 4.625" fronts - FJ only ?? but similar in F2 F1 and potential 2750cc Intercontinental versions)
the Lotus Elite had 3.5" tyres iirc

remember before 1961 almost any car (ie F2 F3 FJunior) was F1-legal
remember there were hundreds of non-WDC F1 races
remember F1 cars weren't legal for 1952 and 1953 WDCs (the Ferrari 500 was an F2 car not an F1 car)

GraysonTremont
GraysonTremont
0
Joined: 29 Mar 2025, 11:55

Re: F1 tire sizes in the 1950s

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Tire evolution in F1 history is fascinating!

woohoo
woohoo
7
Joined: 10 Aug 2008, 01:12

Re: F1 tire sizes in the 1950s

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Thank you very much for your replies!

However, one aspect (ba-dum-tish!) is missing...
What is the aspect ratio of the tires? The height of them?

We have discovered the diameter and width, but the final number is missing. :)
The only way to close a stupid question is to give a smart answer

User avatar
BassVirolla
12
Joined: 20 Jul 2018, 23:55

Re: F1 tire sizes in the 1950s

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woohoo wrote:
18 Apr 2025, 12:49
Thank you very much for your replies!

However, one aspect (ba-dum-tish!) is missing...
What is the aspect ratio of the tires? The height of them?

We have discovered the diameter and width, but the final number is missing. :)
In the past, for road cars with metric system (in mm) when omitting the aspect ratio it was assumed as an 80.

Nevertheless, I can't assess it in racing nor imperial, but you can start investigating from there.

Tommy Cookers
Tommy Cookers
650
Joined: 17 Feb 2012, 16:55

Re: F1 tire sizes in the 1950s

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woohoo wrote:
18 Apr 2025, 12:49
Thank you very much for your replies!

However, one aspect (ba-dum-tish!) is missing...
What is the aspect ratio of the tires? The height of them?

We have discovered the diameter and width, but the final number is missing. :)
there was no aspect ratio
a 6" tyre had (notionally anyway) a sectional width of 6" and a sectional height of 6"

remember race tyres were typically crossply until the 1980s
AR is a part of the (road) radial ply invention by Michelin c.1960

crossplies carry no AR number even today
(to comfort a nervous public and unofficially there are now some suggested AR-equivalence values eg 95% or 100%)

longstonetyres.co.uk are really expert in such matters

still in 1951 (400+ hp) F1 tyres were dangerously failure-prone mostly by the entire tread falling off with high wheel rpm
this caused Ferrari losses at the fast tracks due to keeping 16" wheels when Alfa used 18" etc
by the late 50s fuel stops weren't necessary so tyre wear became an issue
when Brabham won at Aintree he had thick sportscar front tyres for wear reasons and drove tail-happy to help this


btw
Ivan Dutton is a UK national treasure ....
his early mini has serial number 0571- surely this was actually 71st in the pre-production batch of 100
(that's why it has the magnesium transmission casing and the body drainage fault)
somebody tell him .....

he reconstructed the twin-cylinder Mini engine (by making a 180 degree crankshaft and camshaft)
surely it was intended to have had a 360 degree arrangement ? (like the Fiat 500 NSU Prinz Honda etc)
Last edited by Tommy Cookers on 17 May 2025, 10:20, edited 1 time in total.

woohoo
woohoo
7
Joined: 10 Aug 2008, 01:12

Re: F1 tire sizes in the 1950s

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Tommy Cookers wrote:
16 May 2025, 15:45
woohoo wrote:
18 Apr 2025, 12:49
Thank you very much for your replies!

However, one aspect (ba-dum-tish!) is missing...
What is the aspect ratio of the tires? The height of them?

We have discovered the diameter and width, but the final number is missing. :)
there was no aspect ratio
a 6" tyre had (notionally anyway) a sectional width of 6" and a sectional height of 6"


remember race tyres were typically crossply until the 1980s
AR is a part of the (road) radial ply invention by Michelin c.1960

crossplies carry no AR number even today
(to comfort a nervous public and unofficially there are now some suggested AR-equivalence values eg 95% or 100%)

longstone tyres.co.uk are really expert in such matters

still in 1951 (400+ hp) F1 tyres were dangerously failure-prone mostly by the entire tread falling off with high wheel rpm
this caused Ferrari losses at the fast tracks due to keeping 16" wheels when Alfa used 18" etc
by the late 50s fuel stops weren't necessary so tyre wear became an issue
when Brabham won at Aintree he had thick sportscar front tyres for wear reasons and drove tail-happy to help this


btw
Ivan Dutton the UK a national treasure ....
his early mini has serial number 0571- surely this was actually 71st in the pre-production batch of 100
(that's why it has the magnesium transmission casing and the body drainage fault)
somebody tell him .....

he reconstructed the twin-cylinder Mini engine (by making a 180 degree crankshaft and camshaft)
surely it was intended to have had a 360 degree arrangement ? (like the Fiat 500 NSU Prinz Honda etc)
Aaaa! I see!
Many thanks for the reply and the explanation and information!
That helps me a great deal.
[-o<
The only way to close a stupid question is to give a smart answer