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225 vs 235 on TT


Kiko

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On a clear attempt to reduce understeer and to comply with the GT3's "N" rating of 235's I'm thinking about fitting 235 fr and 295 rear. The calculations say the rolling radius diferences are...

Brand new 235/295 = 1,7%

New 235 and worn 295 = 2,6%

New 225/295 = 0.5%

I think I read somewhere the max admisible difference on a 4wd would be 3% if this correct the 235/295 shouldn't present a problem on a TT...

Loren,

Whats your opinion on this one?

Best Wishes to you all

Francisco

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On a clear attempt to reduce understeer and to comply with the GT3's "N" rating of 235's I'm thinking about fitting 235 fr and 295 rear. The calculations say the rolling radius diferences are...

Brand new 235/295 = 1,7%

New 235 and worn 295 = 2,6%

New 225/295 = 0.5%

I think I read somewhere the max admisible difference on a 4wd would be 3% if this correct the 235/295 shouldn't present a problem on a TT...

Loren,

Whats your opinion on this one?

Best Wishes to you all

Francisco

HI Kiko,

I've been running with 235 on the front for quite a while now with no problems. I've always run Pirelli Corsa & Corsa System (N6) (for the winter/wet) which is the standard tyre for the GT3RS.

This tyre change combined with a geometry setup to increase -ve camber and reduce toe-in has reduced/minimised the understeer characteristic.

Damian

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Thanks for your input Damian, even if theory and numbers show alot the practical experience is the ultimate test for everything...

Would you like to share with us your experience withose tires and on the alignment topic give us your set up?

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  • 8 months later...

Just fitted 235/40 in the front but it messes with ABS/PSM to the point of kicking in mid turn just by touching the brake pedal due to the increased turning radius. I already ordered a set of 225's...

Edited by Kiko
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