Tyre footprint

[Steevo]

Anybody know which of these would have a larger footprint please?

800 / 65 R 32

710 / 70 R 38

 

[Matt L]

you’d need to know brand and load and pressure in them to work out the flat plate area I’m afraid.

 

[Steevo]

you’d need to know brand and load and pressure in them to work out the flat plate area I’m afraid.

Both Goodyear

Both identical load

Pressure identical also.

 

[Matt L]

Yes but without knowing the exact model of tyre. The exact pressure and the exact load the different tyres will flex different amounts. You can easily make a 650 profile tyre have a larger footprint than a 710 but you won’t carry a plough or do more than 10kph with it. It’s all relative I’m afraid.

 

[Skimmer]

At the same pressure wont they both have the same footprint

 

[Dog]

If they both carry the same weight at the same pressure at the same speed and there carcass’s are the same( side wall stiffness) they will have very similar foot print size.

 

[Steevo]

Interesting, thank you...! I hadn't thought about it that way but could see some logic in it.

Same weight as same machine
Same pressure as again same machine so wouldn't see the logic in changing the pressure much
Same speed - same machine (though obv larger tyre would do higher top speed as larger circumference)
Same brand of tyre so assume side wall stiffness would be the same

Seems there could well be little change then.

 

[Steevo]

@Terry Elsey Tyres - please don't feel the need to comment if you don't wish to, but thought I'd flag this up in case you had any input

 

[Terry Elsey Tyres]

 

[Dog]

I don’t mean top speed of machine or total weight of machine. You will have to look at tyre charts from manufacture. For example you will need to find the weight that the tyre will be carrying, then decide what speed you want to travel at, then look to see how much pressure the tyre needs. Do this for both tyres and the one with the lowest pressure will have the biggest footprint. Just had a quick look in one of my book for an example a 800 65 32will carry 4585kg at 15 psi at 30kph and a 710 70 38 will carry 4950kg at the same speed and pressure. The 710 is a lot taller tyre.

 

[Clive]

do Goodyear have technical area managers that will come out and advice on application like Michelin do ?

 

[Fragonard]

Can you compare 710/75/34 to the 800s please

 

[David.]

Assume it might be a combine, how much hindrance will the 8" of extra width be on the road?

 

[snipe]

do you need to know footprint size, surly the pressure in the tyre is the thing to consider( which can be easily worked out) which I would have though will be directly related to footprint size,

 

[Terry Elsey Tyres]