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systech1
Newbie


Joined: 10 Jul 2016
Posts: 45
Location: Adelaide, South Australia


PostPosted: Fri Dec 01, 2017 2:17 am    Post subject: 305 vs 295 Michelin PS4S ? Reply with quote

Greetings again from downunder.

I'm tempted to fit 305/35/19 Michelin PS4S tyres on my MY2010 997.2S manual rather than the standard 295s. I'm sure fender clearance is not an issue but are there any other issues I need to consider (e.g. handling/transmission load/ PSC response / speedo error (presumably tyre circumference with the same aspect ratio is a little higher and assuming speedo is driven from ABS sensor on wheels) ?

Does the wider tyre provide significant improvement in handling? Anyone done this before and have experience that can be shared?

Thanks in advance for any help Very Happy

BTW, just installed the DSC Sports V1 PASM replacement via the group buy and am really impressed !
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Long time Porsche fan. Previous cars include 911T, 911E, Carrera 3.0, Boxster S. Current car is 997.2S Manual
 
  
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FZP
Suzuka


Joined: 18 Jan 2015
Posts: 1053
Location: Cheshire


PostPosted: Fri Dec 01, 2017 6:50 am    Post subject: Reply with quote

You can fit either size from my understanding. Some people also put 245 in the front vs 235. No other issues as they're the same circumference.
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997.2 Carrera 2S GT Silver/Cocoa.
 
  
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MaxA
Imola


Joined: 11 Oct 2015
Posts: 799
Location: Helsinki


PostPosted: Fri Dec 01, 2017 7:30 am    Post subject: Reply with quote

Wider tyres = more lateral grip, slightly higher rolling resistance, slightly more sidewall (35% of 305mm). As long as your rims are wide enough, I wouldn't say it's an issue in terms of fitment, but I'm not sure there's any real benefit either.
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2010 997.2 in Finnish "Suomi-100" spec: 4S, white over blue, Nokian studded tyres.
 
  
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Gollom122
Suzuka


Joined: 21 Jul 2010
Posts: 1142
Location: North East England


PostPosted: Fri Dec 01, 2017 12:13 pm    Post subject: Reply with quote

I had 305's on my C2S. Slightly harder ride but not that noticeable TBH. Look better and more rim protection.
 
  
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redbaron1973
Newbie


Joined: 10 Sep 2017
Posts: 22



PostPosted: Fri Dec 01, 2017 1:16 pm    Post subject: Reply with quote

Surely the wider rear just makes it understeer more?
 
  
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Cy00
Newbie


Joined: 09 May 2017
Posts: 2



PostPosted: Sun Dec 03, 2017 3:54 am    Post subject: Reply with quote

If you have the optional carrera sport wheels which are 8.5j front and 11.5j rear it comes with 305s at the rear.
The oem rear wheel width is 11j and it is best suited for a 295mm tyre. However, you can fit 305s on it if you really want to.
 
  
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Ratattak
Newbie


Joined: 17 Sep 2017
Posts: 24
Location: About 53°29'12"N 0°59'53"W


PostPosted: Sun Dec 03, 2017 8:51 am    Post subject: Reply with quote

Got them on mine more for show than go ... no problems and less prone to tyre skip in cold weather
 



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systech1
Newbie


Joined: 10 Jul 2016
Posts: 45
Location: Adelaide, South Australia


PostPosted: Mon Dec 04, 2017 6:25 am    Post subject: Reply with quote

Cy00 wrote:
If you have the optional carrera sport wheels which are 8.5j front and 11.5j rear it comes with 305s at the rear.
The oem rear wheel width is 11j and it is best suited for a 295mm tyre. However, you can fit 305s on it if you really want to.


I should have indicated that I have the Carrera Sport wheels (11.5") at the rear so I think you are suggesting that they SHOULD be fitted with 305 tyres (mine currently have 295s and 235/3519s at the front). Some forums suggest that the 305s should be mated with 245/35/19s at the front to prevent understeer.

Thoughts ?

TIA
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Long time Porsche fan. Previous cars include 911T, 911E, Carrera 3.0, Boxster S. Current car is 997.2S Manual
 
  
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MaxA
Imola


Joined: 11 Oct 2015
Posts: 799
Location: Helsinki


PostPosted: Mon Dec 04, 2017 7:02 am    Post subject: Reply with quote

I've got my winter 295s mounted on the 11.5 inch Carrera Sports, and summer 305s on my 11 inch OZs, which is arse about face, with 235s up front. I will be fitting new front camber plates to help reduce the low speed understeer at the front, and I suppose I might run 245s up front next time round, to help with the balance front to rear, but it is a lot of rubber on the road.
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2010 997.2 in Finnish "Suomi-100" spec: 4S, white over blue, Nokian studded tyres.
 
  
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