GT3 RSR ......just curious really....

[V8KSN]

What size wheel and tyres are on the GT3 RSR cars like this one?



Reason I ask is because there is an article in this months evo magazine on the relationship of wheel sizes and tyres on the ride quality of a given vehicle

[Slippydiff]

11 & 13 x 18"

[V8KSN]

Slippydiff said:

11 & 13 x 18"

Nice one Slippydiff, any idea on the tyre size?

[PHOENIXUK]

V8KSN said:

Nice one Slippydiff, any idea on the tyre size?

300/60/18 rears, I think.

[RDMcG]

Narrower than the standard 3.8 RS then. Mine are 325-19 rear and 285-19 front. PS cups rather than pure track tires.

[keep it lit]

V8KSN said:

any idea on the tyre size?

massive!! something like 325/335 rears.. 7cups run 315/690R18 rears.

[mollytherocker]

Proof, if proof was needed, that 20" wheels are plain stupid.

MTR

[fioran0]

The RSR now runs 12jx18 front rims and 14jx18 rears. Tyres are 27/68-18 and 31/71-18. These measure up at about 315mm front and 350mm rear in road tyre equivelant. Sidewalls are super tall both front and rear.

ACO regs specify an 18" wheel has to be used in GTE so everything running in this class has 18" rims incl the RSR.

Edited by fioran0 on Friday 27th April 00:26

[Slippydiff]

fioran0 said:

The RSR now runs 12jx18 front rims and 14jx18 rears. Tyres are 27/68-18 and 31/71-18. These measure up at about 315mm front and 350mm rear in road tyre equivelant. Sidewalls are super tall both front and rear.

ACO regs specify an 18" wheel has to be used in GTE so everything running in this class has 18" rims incl the RSR.

Hopeless information Neil, you've not provided the ET numbers for the wheels . . . .

[Jim1556]

Why do slicks/race tyres come in daft sizes? What's wrong with 295/35/19 or 255/35/18 etc? There must be an actual reason...?

[fioran0]

Slippydiff said:

Hopeless information Neil, you've not provided the ET numbers for the wheels . . . .

Haha. Well one doesn't like to appear too keen.......... Plus I'm operating off of my memory banks and I've no actual idea what offset is

[RatBoy M3CSL]

.. Have you ever tried to buy 19" slicks..?

Mich/Dunlop make a big range of 18 inch rubber, but 19's cost a fortune and dont come in many compounds dry or wets..

[Slippydiff]

fioran0 said:

Slippydiff said:

Hopeless information Neil, you've not provided the ET numbers for the wheels . . . .

Haha. Well one doesn't like to appear too keen.......... Plus I'm operating off of my memory banks and I've no actual idea what offset is

The 13" rears are ET 12.5.

The 11" fronts are ET 35

[maximtaylor]

Jim1556 said:

Why do slicks/race tyres come in daft sizes? What's wrong with 295/35/19 or 255/35/18 etc? There must be an actual reason...?

Its actually easier to follow, once you get familiar with it.

For example:

27/68/18 = 270mm tread width, 680mm diameter
31/71/18 = 310mm tread width, 710mm diameter

Its saves lots of farking about working out tyre diameters if you fancy different rubber, rather than trying to work it out from profile %

Edited by maximtaylor on Friday 27th April 17:39

[drpep]

mollytherocker said:

Proof, if proof was needed, that 20" wheels are plain stupid.

MTR

+1

If you need 20" wheels to accommodate your brakes then you're probably in a dragster.

Pointless.

Incidentally the e92 M3 looks Motorsport-wonderful on BMW's 18 inchers. The 19s look horribly blingy to my eyes.

[DiscoColin]

drpep said:

If you need 20" wheels to accommodate your brakes then you're probably in a dragster.

Well, no really. Dragster brakes are not overly large as I understand it - nothing like enough to mandate big wheels. Thus by 'dragster' I assume that you mean a too-heavy road car with too much power.....

[Something very modified and lardy - perhaps based on a Nissan or a heavyweight Merc]