## Tyre evolution

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marmer
2
Joined: Fri Apr 21, 2017 5:48 am

### Tyre evolution

simple question might be a complicated answer.

as f1 tyres loose rubber and flick it all around the track does this affect the wheel diameter and ride height of the car surely it should with how precise f1 cars are made. if you loose 5 mill in ride height over a tyres life this would affect performance

cramr
4
Joined: Wed Feb 10, 2016 7:51 am

### Re: Tyre evolution

I think the possible tyre change in radius is irrelevant compared with the weight reduction of the fuel they are burning, 105kg per race, around 2 or so per lap.

This weight change surely create a bigger effect on the car that the possible 5mm over 30 laps

ChrisDanger
40
Joined: Wed Mar 30, 2011 8:59 am

### Re: Tyre evolution

Well a 5mm change in radius is about 1.5% difference. For a given torque the available propulsion force would change by this amount (smaller radius = greater force) and for one rotation of the wheel you would travel less distance the more wear there is by the same percentage. You can think of it like affecting the final drive ratio. So more wear, or a smaller wheel, would mean higher acceleration with a lower top speed. Also the larger the diameter the larger the contact patch (for vertical sidewalls), so you'd have more grip from a new tyre all else being equal (which it's not).

hollus
362
Joined: Sun Mar 29, 2009 12:21 am
Location: Copenhagen, Denmark

### Re: Tyre evolution

I once made the same question, thinking of top speeds in the days of rev limiters enforced in the rules. I was told that tire wear will account for 1 mm tops.
OK, OK, looks like Santa Claus is going to survive this summer after all.

marmer
2
Joined: Fri Apr 21, 2017 5:48 am

### Re: Tyre evolution

thanks

Jersey Tom
249
Joined: Mon May 29, 2006 7:49 pm
Location: Huntersville, NC

### Re: Tyre evolution

The total depth of tread rubber on a racing tire tends to only be 2-3, maybe 4mm. Wear will be somewhere less than that.

Lot of things are going on as a tire is raced. Wear absolutely will affect both loaded and effective radii. If inflation pressure changes as tire temperature goes up or down, that will also affect things. Likewise, you can have carcass degradation as well.
Grip is a four letter word. All opinions are my own and not those of current or previous employers.

marmer
2
Joined: Fri Apr 21, 2017 5:48 am

### Re: Tyre evolution

would have thought there was more depth than that based on the amount of marbles left

ChrisDanger
40
Joined: Wed Mar 30, 2011 8:59 am

### Re: Tyre evolution

Yeah, I also thought there'd be more wear, thinking about the amount of marbles.

With a two stop race and an average of 1.75 mm wear, a total of 0.25 m³ of rubber would be generated, which is quite a lot. It's about a litre of rubber shed per tyre.

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