looking to purchase snows for my 2014 991 c4s and just found out that the stock 305/30 20's in the rear are not available in snow's. The next closest snow tire size is a 295/30 20 but the spec on the 295's have a max wheel width of 11". I have sport techno wheels and the rears measure 11.5" wide.
someone help, just spent a load of money and planned to drive my baby all year round, northeast winter is a coming.

 

I decided not to use my OEM wheels in the snow and go thru the unmounting and remounting them. Bought some nice inexpensive Victor Equipment wheels with snow tires.

 

^ Sport Techno wheels are too nice to use for snows.
Definitely better to get some cheap aftermarket wheels for winter driving.

I'd bet a 295 on an 11-1/2 won't cause any problems other than exposing the rim edge a little further than ideal.
Tolerance can't be so tight that an 11 is fine and an 11.5 is dangerous.
It's only a 4.5% increase in rim width.

Some 295's are listed with an 11.5" limit, so it is a reasonable combination.
I can understand if it concerns you, but I would run it without a worry.
I'd worry more about just driving my 991 in snow, although I'd bet it is fun.

 

Yes, I guess I'll have to spring for a set of rims. The car is my wife's grocery getter and my weekend toy. Thanks everyone.

 

How are the victor wheels are they strong, I've always had trouble bending aftermarkets?

 

try the classifieds, might find a decent set of oem that you could use

 

You really want a your snow tires a little narrower than your summer tires when you get into the 991 sizing. Snow tires that are too wide won't dig down into the snow as well as those a little narrower.

 

It's probably worth investing in a set of dedicated winter rims (either OEM or some aftermarket rims -- I have a set of OZ Ultraleggera HLTs on order) and swapping out the rims and tires seasonally. I think it'll cause less wear and tear on the Sport Technos than if you have them pulling the rubber on and off multiple times.

 

I decided to drive the Sport Technos year-round with the Sottozeros in 295/30 on the rears. I've included a pic so you can see it is indeed possible. They were bought from and mounted by my Pcar dealer.