Selection Of tyres

[manifold]

Going by the logic that there is more weight distribution on the rear (probably more that 60:40 in formula cars. Why we use same size tyres in front than the rear?

Since load is more at the rear the rear will reach a higher slip angle at a given speed than the front which means that there will be over steer.

y not use a fatter tyre at the rear to get more grip and compensate the front geometry to under steer. Ultimately gaining more speed via the corner.

In fsae cars same tyres running on front and rear, I was wondering why?

[manifold]

Going by the logic that there is more weight distribution on the rear (probably more that 60:40 in formula cars. Why we use same size tyres in front than the rear?

Since load is more at the rear the rear will reach a higher slip angle at a given speed than the front which means that there will be over steer.

y not use a fatter tyre at the rear to get more grip and compensate the front geometry to under steer. Ultimately gaining more speed via the corner.

In fsae cars same tyres running on front and rear, I was wondering why?

[Joe17]

Because Racecar.

[ZAMR]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by manifold:
Going by the logic that there is more weight distribution on the rear (probably more that 60:40 in formula cars. Why we use same size tyres in front than the rear?

Since load is more at the rear the rear will reach a higher slip angle at a given speed than the front which means that there will be over steer.

y not use a fatter tyre at the rear to get more grip and compensate the front geometry to under steer. Ultimately gaining more speed via the corner.

In fsae cars same tyres running on front and rear, I was wondering why? </div></BLOCKQUOTE>

If this is joke, then maybe i the burnt of it

But anyways,

Can you change front/rear weight transfer dist. without changing tires? yes

Weight dist. is not usually past 60:40, unless you are Maryland. Most cars with small engines are around 55:45 I reckon. To be fair, Maryland is far past 60:40 and they do run a "fat" tire in the rear. Mmmmmm fat tire...

"Oversteer" is hard to pinpoint, esp since the dynamics of the car can change a great deal at different speeds. There are contributions to steering stability/instability other than lateral force at the cp. FSAE cars are typically subjected to very tight corners and high steering angles. Oversteer is not a constant and is not determined solely by weight dist and tires.

Will you get more "grip" with an "overweight" tire (calling it fat may hurt its feelings). Different tires' temperature changes differently over time. What if your terminal understeer/oversteer characteristics not only changed with vehicle speed but were heavily influenced by time as well?

Some oversteer, or over-yaw-acceleration might be beneficial on some parts of the race track, especially an FSAE racetrack.

[Mike Cook]

mmmmmm fat tire.

[RANeff]

Mmmm not as fat, fat tire



In all honestly, there are a few teams who do run wider rear tires. Mainly german

[exFSAE]

Left Hand &gt; New Belgium

[RANeff]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by exFSAE:
Left Hand &gt; New Belgium </div></BLOCKQUOTE>

Odells, Rouge, Stone, Southern Tier, New Glarus, etc. &gt; New Belgium

[manifold]

cheers

[manifold]

@ raneff you wasted too much of your time writing these things ,if you could have written something that could have been helpfull