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Question about tires
- Thread starter ualla
- Start date
Martin996RSR
Montreal
- Joined
- 8 Dec 2016
- Messages
- 613
I run sport design wheels with 265 section on the rear and 235 on the front. The fronts are Goodyear Eagle F1 and the rears are cheapo dichfinders, but I still find the rear over-tyred.
295 and even 285 on a C2 or C4 is massive orverkill. Porsche only lets you put 285 rears on because they know this sells cars to people who put aesthetics ahead of handling.
These cars naturally understeer and you really have to get the geometry bob-on, as well as not make bad tyre decisions if you want a neutral car. I have even resorted to running wihtout a front anti-roll bar in the past to kill the understeer, and am shortly to be resorting to a base-model boxster one to soften the front roll stiffness to get it to grip more.
Check out ELA's car and you'll see that he's specced much narrower tyres on the rear (245 IIRC). This is because he's building a car that is intended to be neutral rather than understeery.
295 and even 285 on a C2 or C4 is massive orverkill. Porsche only lets you put 285 rears on because they know this sells cars to people who put aesthetics ahead of handling.
These cars naturally understeer and you really have to get the geometry bob-on, as well as not make bad tyre decisions if you want a neutral car. I have even resorted to running wihtout a front anti-roll bar in the past to kill the understeer, and am shortly to be resorting to a base-model boxster one to soften the front roll stiffness to get it to grip more.
Check out ELA's car and you'll see that he's specced much narrower tyres on the rear (245 IIRC). This is because he's building a car that is intended to be neutral rather than understeery.
I've recently bought some Carrera 5 spoke 18" wheels, so this thread is pertinent to my interests.
They're 8" front and 10" rear, I was going to go with 225/40 on the front and 265/35 on the rear - I understand that 285/30 is an approved option but hoped that the higher sidewall to tread ratio of the 265/35 would be a bit more compliant. I'm coming from 17" wheels with 255/40 on the rear.
Am I kidding myself and there'll be no discernable difference between 265/35 and 285/30?
They're 8" front and 10" rear, I was going to go with 225/40 on the front and 265/35 on the rear - I understand that 285/30 is an approved option but hoped that the higher sidewall to tread ratio of the 265/35 would be a bit more compliant. I'm coming from 17" wheels with 255/40 on the rear.
Am I kidding myself and there'll be no discernable difference between 265/35 and 285/30?
Martin996RSR
Montreal
- Joined
- 8 Dec 2016
- Messages
- 613
Probably no difference, but any difference that there is will be made more discernable depending on your suspension. If you have stock shocks/springs then probably no difference, but if you have something harder then this will make differences in the tyre more apparent.
However, by going to 285 on the back without going to 235 on the front, you're just making an already understeery car worse. Stick with the 265 section on the rear and add 15mm spacers if you want it to look boss.
However, by going to 285 on the back without going to 235 on the front, you're just making an already understeery car worse. Stick with the 265 section on the rear and add 15mm spacers if you want it to look boss.
bakerboy4s
Nurburgring
- Joined
- 6 Jun 2015
- Messages
- 396
http://www.porsche.com/filestore.as...es-986-996&pool=uk&lang=none&filetype=default
Thought this relevant
Thought this relevant
For what it's worth i just fitted Kumho PS91 all round to mine in the OEM sizes, 265 rear and 225 front. The PS91 is recommended by the tyre manufacture as suitable for 911 - it is one of the 'sample vehicles' they mention for it. They are marketed as a rival to Michelin Pilot Super Sport to give an idea of characteristics.
mmcd87 said:
I and a few others have great results from the KU39, one down the pecking order from a PS91. Would interesting to hear your thoughts when they are worn in a bit.
http://kumhotyre.co.uk/kumho-news/new-super-tyre-for-the-supercar-coming-to-the-uk-the-kumho-ps91/
wasz said:
Hoping to get a decent run out in the car now the weather is improving. Not sure if I'm allowed to link but there is a bit more detail here http://www.pistonheads.com/gassing/topic.asp?h=0&f=230&t=1621214&p=8
I have KU39 on my Mazda Mx5 and they are great on that so I wasnt to worried about trying these out.
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