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CJP
Newbie


Joined: 17 Mar 2018
Posts: 5



PostPosted: Sat Nov 10, 2018 9:14 pm    Post subject: Winter tyres / wheels for my C4S Reply with quote

Hi guys,

I am a bit confused over my options here. Thing is, I have a 2002 C4S - and am considering buying winter tyres for it. However, 18" tyres and a new set of wheels costs a fortune here in DK and I am not keeping the car for the next winter. So: What are my options in terms of used wheels and other sizes than 225/40-18 + 265/35-18?

For instance, I have from my 2007 Cayman a set of 205/50-17 + 225/45-17. Is that a sort of blasphemy and/or dangerous to put on the C4S? Or could I use another tyre size on the rear wheels?
 
  
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Ghianightmare
Monza


Joined: 25 Apr 2017
Posts: 176
Location: Dublin


PostPosted: Sat Nov 10, 2018 9:59 pm    Post subject: Reply with quote

You have to be carful using non standard tyres on the C4S because of the viscous coupling in the 4 wheel drive system. If then front and back are not the same rolling diameter you can break it.

Only use the Porsche recommended sizes.
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2002 Seal Grey C4S
 
  
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Magic919
Österreich


Joined: 05 Jun 2013
Posts: 909
Location: Berkshire


PostPosted: Sun Nov 11, 2018 7:56 am    Post subject: Reply with quote

There are PDFs on the Internet with Porsche tyre/wheel sizes from summer and winter.

Look at using your current wheels to save costs.

There is a size differential of about 3-4% front to back. Less than that the AWD system will be even less effective.
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997.2 C2S PDK
997.2 C4S PDK
 
  
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asterix_the_gaul
Suzuka


Joined: 20 Dec 2008
Posts: 1136
Location: Cheshire

1999 Porsche 996 Carrera 2

PostPosted: Sun Nov 11, 2018 6:36 pm    Post subject: Reply with quote

Easiest solution is to pick up a set of winter tyres for the current wheels either new or part worn and swop over on the current wheels. Swop back to summers or sell the car with winter tyres on, your choice, depends on time of year of sale. The cayman wheels will be the same rolling radius front to rear so no problem but offsets probably well off so will look odd. You can check rolling radius and offset differences using online calculators like website Willtheyfit.
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1992 944 S2 Cabriolet, Cobalt Blue/Classic grey -gone!
1995 993 C2 Cabriolet, Midnight Blue/Marble grey -gone!
1999 996 C2 Coupe, Ocean Blue/Graphite grey
2002 E46 M3 Cabriolet, Laguna seca blue/LSB
 
  
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BK911
Spa-Francorchamps


Joined: 16 Mar 2008
Posts: 371
Location: London

1990 Porsche 964 Carrera 4

PostPosted: Tue Nov 20, 2018 10:30 pm    Post subject: Reply with quote

Don’t want to discourage safety... (proviso is I live within the M25 on the south side) but I ran my car all last winter on new N1 MPS2... and go to work at 4am on untreated roads sometimes,, the C4s never lost traction... if I had a c2 I’d definitely invest in winter tyres but C4s seems to get away with it in my experience. just saying, if you feel you need them don’t hesitate and do it.

I had an E92 M3 before as my daily that I bought winter tyres for.. they were excellent. Pirelli Sottozero from tyreleader...
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GT4 ClubSport
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FZP
Magny-Cours


Joined: 18 Jan 2015
Posts: 2711
Location: Cheshire


PostPosted: Wed Nov 21, 2018 7:53 am    Post subject: Reply with quote

I went for a cruise on the weekend and gave the accelerator a squeeze and lit up the rears in 3rd. Looked down at the temp gauge, 7.0°. S
O they don't joke about the 8° cut off for summer tyres.
If you're using it as a daily then you should definitely get a set
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997.2 Carrera 2S GT Silver/Cocoa.
 
  
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14490
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Nov 21, 2018 8:48 am    Post subject: Reply with quote

I didn't have a problem last year and I live in quite a hilly area. Used the car daily and never got stuck. My rear summer tyres were down to the bone too. Just remember to turn your psm off if you're struggling up hill.


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2000 Manual 996 C4 Arctic Silver Convertible


 
  
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Shurv
Albert Park


Joined: 09 Jan 2013
Posts: 1727
Location: Northampton


PostPosted: Wed Nov 21, 2018 9:21 am    Post subject: Reply with quote

I live in a village at the top of a hill, last winter I got caught in a sudden snow storm whilst out visiting friends, thought I'd be ok as I had AWD in my 996 C4S. Nope, I had to abandon it at the bottom of the hill in a side road for 2 days and got it home when the snow has started to melt. As soon as I got it home I put my winter wheels/tyres on and all was good. Days when my daily wouldn't get off the drive (rwd and auto) due to snow, I took the 996 with winters and got everywhere. I enjoyed the looks at work when the only people in were those with 4x4's. The best comments were "I bet that was interesting coming in in that?"
I find that the comments of "you don't need winter tyres in winter" come from those who have never driven on winters. Those who have know different. Mrs Shurv has a Toyota Rav4 with Goodyear Vector 4 all season tyres on. It is left on these all the time, they are great tyres and we welcome a few inches of the white stuff this winter.
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 14490
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Wed Nov 21, 2018 9:28 am    Post subject: Reply with quote

Did you turn you psm off when you got stuck?

Design fault on the awd 996 is the psm prevents the awd system working in the snow.
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2000 Manual 996 C4 Arctic Silver Convertible


 
  
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MaxA
Barcelona


Joined: 11 Oct 2015
Posts: 1316
Location: Helsinki


PostPosted: Wed Nov 21, 2018 11:19 am    Post subject: Reply with quote

I have driven my C4S on its summer Michelins on Finnish roads at -1c-0c-+1c and it just slithers around (lane changes at speed being a particular highlight).

You can 'manage' but it's better on winters. And it's certainly better on winters if you have any plans to brake. The other real benefit of winters is that they're more fun.

If anyone has any doubts at all, book a flight up here and I'll show you what I mean, in person, with my C4S on Nokian Hakkapeliitta's. I'll even come and pick you up from the airport.
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2010 9972 C4S PDK: Carrara White, Sea Blue. Mostly driven, lightly modified, occasionally tracked, and usually a bit grubby.
 
  
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demon
Spa-Francorchamps


Joined: 19 Apr 2011
Posts: 288



PostPosted: Wed Nov 21, 2018 11:43 am    Post subject: Reply with quote

Any summer tyre is going to be outside of its intended performance range below an air temperature of ~7 degrees.... yet no one thinks of this or changes the way they drive, let alone what tyres they are driving on - madness!


At least a 996 seems to put people enough in touch with the basic physics that they either drive differently, put the car away for winter, or fit winter tyres - yet we all face the "traditional" commentary when we park up and walk into the office...
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1998 Carrera - Black, no sunroof, manual, Ohlins R&T, LSD, polybushed, Girodisc brakes, custom ("shaved") GT3 RS decklid, 997 sports seats, litronic headlights, RUF mirrors (still in progress!)
 
  
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Disco
Estoril


Joined: 13 May 2008
Posts: 3886
Location: Hertfordshire

2010 Porsche 997 GT3

PostPosted: Wed Nov 21, 2018 4:16 pm    Post subject: Reply with quote

Buy a second hand set of wheels on eBay. If you ever sell the car then you ought to be able to get back most or all of what you paid for them. Thumb
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Colin

Black 997 GT3 3.8 CS - Acquired for the 2012 season and beyond
Black 996 GT3 Mk2 - Gone, but will never be forgotten
 
  
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B16DSS
Newbie


Joined: 12 Apr 2012
Posts: 17


2002 Porsche 996 Targa

PostPosted: Tue Nov 27, 2018 9:40 pm    Post subject: Reply with quote

I've just purchasing 997 Carrera III 18" alloys complete with Conti winters. in great condition.....off ebay..fitted to my Targa. 997 offsets are slightly different to 996 Carrera classics but wheels fit & look fine!

Bargain at just over 100 notes a corner & means I'm happier with RWD in winter conditions.
 
  
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strathconaman
Newbie


Joined: 06 Mar 2018
Posts: 9
Location: Kanukistan


PostPosted: Thu Nov 29, 2018 2:36 am    Post subject: Re: Winter tyres / wheels for my C4S Reply with quote

CJP wrote:
Hi guys,

So: What are my options in terms of used wheels and other sizes than 225/40-18 + 265/35-18?


Just keep in mind that the "N" rated snow tires that are 225/40R18 have a larger circumference than the rear 265/35R18, BUT many tires are smaller at 225/40R18 than the rear, and you will have to size up to 235/40R18.

Look at the actual revs per mile for the tires you are considering, rather than the nominal size.
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The Porsche 911 [996] C4S is the reason why people work 16-hour days and eat nothing but peanut butter sandwiches for 2 years straight.
(European Car Magazine, September 2004 Vol 35 No. 9, page 74)
 
  
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