Wheel offset and width question

[doug davis]

I'm considering buying a nice set of blizzaks mounted on wheels I saw adverised on rennlist for a good price.

My car is a 99 C2 (narrow body) USA with a M030 ROW suspension.

The wheels are called "cup 3" made by some Italian Co. the guy bought them from tire rack.

sizes are as follows:

Fronts Blizzack LM25 205-50-17 rims are 7.5X17 ET 52

Rears Blizzack LM25 255-40-17 rims are 9X17 ET 47

From my research, the tires are the right size but the rims are slightly diffrent from stock Porsche recommendations.

My question is will they work properly for my car?

The guy had them on his car and he said they worked just fine. I'm inclined to buy them but just wanted second opinion from this list if possible.

Thanks,

Doug Davis

[doug davis]

bump. Anybody?

[Loren]

All the approved tire sizes are covered in the TSB - Winter Tires and Wheels.

[doug davis]

All the approved tire sizes are covered in the TSB - Winter Tires and Wheels.

Yes thank you Loren, I read the TSB already. I know they are not the approved sizes Porsche lists.

The wheels are Sport Edition Cup 3. These are probably what most people get when they call up Tire Rack and order a winter tire package for a 996. While shopping for used winter tires/wheels, I've already come across the exact same combination at least several times so there must be a lot of sets like this out there!

People on this list and others are selling and buying winter sets all the time and since many were originally bought from places like Tire Rack, It would be useful to find out how they perform, even though they are not "approved" sizes.

Thanks,

Doug Davis

[Dharn55]

Rears offsets are way off for a NB 996, may be from a Boxster. The difference between the standard 65 offset and the 47 of the one you are considering means the rims are moved out 18 mm. However the wheels are also 9" instead of 10" so you might get away with it. Go here

http://1010tires.com/WheelOffsetCalculator.asp

and use this offset calculator to see how the new rims will compare with the old rims.

[70Sixter]

Double check with TR. They are usually correct.

And if the other guy had them on car like yours that is a good sign about offset. Rolling radius might be a problem as Dharn55 said.

[doug davis]

Rears offsets are way off for a NB 996, may be from a Boxster. The difference between the standard 65 offset and the 47 of the one you are considering means the rims are moved out 18 mm. However the wheels are also 9" instead of 10" so you might get away with it. Go here

http://1010tires.com/WheelOffsetCalculator.asp

and use this offset calculator to see how the new rims will compare with the old rims.

Yea thanks guys. Dhar55 I think you are reffering to 18" with the 65 offset. These are 17"s Porsche lists 17 rears with a 55 offset. Stock 17" wheels for NB 996 is front is 7x50/55 rear is 9x55

they also list a rear 8.5"x55 for winter tires.

Doug Davis