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YOUR RESEARCHWinter tyre choices for C4S on OEM rear alloys
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Run these
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I run these on my car and the difference in OD when I did an roll out on my alignment rack the difference was fairly minimal.
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I ran this set-up on my previous 996 C4S and used 17mm spacers on the rear to keep the rear wheels flush.
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Suspected cause · Original poster
Buying rear 10J alloys is probably the best option, but it's a lot of money, and wanted to try and see if I could stay with the current 11J alloys.
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Suggestion · Original poster
I know the recommended route is to go to a 10J rear alloy, and use a 265/35 winter tyre.
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Suggestion
Have you considered a set of used wheels or replica wheels in the recommended sizes?
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Hi
I know the recommended route is to go to a 10J rear alloy, and use a 265/35 winter tyre.
I'd like to stick to the OEM rear 11J alloy - what's the winter tyre option? Dunlop 3D's exist in 285/35, but I believe that profile is too high, meaning it's over 4% out from OEM, and that it could cause differential problems? There doesn't seem to be anything in a 30 profile.
Thanks
Gareth.
btw for 9 winters I have run
225/40R18 & 265/35R18 on stock wheels and never had a problem but the rear wheel lip does stick out and from the side wall so it can be more prone to curb rash.
This fellow Cdn totally agrees with last post.
I have winter Dunlops on 17-inches Boxster S wheels as per Porsche recommendation in User Manual. Fits perfectly!
Martin
I know it's an expensive option, but I really like going to the 10" wheel for the rear.
Have you considered a set of used wheels or replica wheels in the recommended sizes? As an example, I bought a set of OEM wheels that were "as new" take-offs for my Cayenne from my local Porsche dealer for $500. I use them for my winter tires.
So you have 17" Boxster S wheels running on a C4S?
What are the size and offset of the Boxster S wheel? I didn't think a 17 would even fit over the big reds we have in the front.
Oops! Sorry Jumper. Mine is a narrow body C2
In summer, I have Sport Design 18-in and the Winter 17-in come up just a close to the fenders as the Sport Design given the greater offset. It looks satisfactory to me.
Regret the induced error on my part.
Martin
I ran this set-up on my previous 996 C4S and used 17mm spacers on the rear to keep the rear wheels flush. 10 inch rears are what the factory recommends, and the 265/35/18 is more readily available (you'll go through the rears in 1 winter season).
yes the OD of the 285/35R18 is a little big, but once stretched out the difference in a lot less. I run these on my car and the difference in OD when I did an roll out on my alignment rack the difference was fairly minimal.
the problem i have is ensuring that i remain within 4% of OEM, otherwise the Luxembourg yearly vehicle test will fail me. Buying rear 10J alloys is probably the best option, but it's a lot of money, and wanted to try and see if I could stay with the current 11J alloys.
If standard sizes on a 996 4S are 225/40 and 295/30, which of the above choices will keep me within 4%?
any idea on the difference between DOT09 and DOT08?? Big price difference, and option of N-2 for both.
PIRELLI W 240 SOTTOZERO S2 N-2
295/35R18 99 V (bis 240 km/h)
Hiver 382,00€
PIRELLI W 240 SOTTOZERO S2 N-2 DOT09
295/35R18 99 V (bis 240 km/h)
Hiver 315,00€
PIRELLI W 240 SOTTOZERO S2 N1 DOT08
295/35R18 99 V (bis 240 km/h)
Hiver 299,00€
PIRELLI W 240 SOTTOZERO S2 N-2 DOT08
295/35R18 99 V (bis 240 km/h)
Hiver 246,00€
This is good advice if you think your main driving condition will be deep stuff. It's not universally true, though. If, like me, most of your Porsche driving is on cold and sometimes wet pavement, then width is still your friend and a winter compound is the key... half the benefit of modern winter tires is in the latter. You have to pick the right tool for the job.
Nobody drives on just one kind of surface in the winter, of course, but the tires you choose should compromise toward the most common one. For many people who drive a sports car in the winter, narrow tires with higher sidewalls aren't actually very helpful, and in typical urban winter driving are an unnecessary compromise. The 'go narrow' wisdom applies only where you think you're going to need your tire to find its way through deep snow to a hard surface.
I've driven my C2 for six winters on Pirelli Snowsport 240s in stock sizes on 18" wheels.
