[Kim]

I have an opportunity to buy these wheels complete with snow tires from a Boxster. They are a twist design, the cost is $500 and would solve my problem with having a hard time buying 245/45 x 16 inch tires.

<!--fonto:Arial--><!--/fonto--><!--sizeo:2--><!--/sizeo-->FRONT 205/50/17, 7X17 ET 55<!--sizec-->
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<!--fonto:Arial--><!--/fonto--><!--sizeo:2--><!--/sizeo-->REAR 255/40/17, 8.5X17 ET 50<!--sizec-->
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[banditsc]

They will fit and be fine for snow tires. You could go wider up front on those rims when you get ready to replace the tires.

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[Anchorman]

For snows, you want to stay narrow rather than wide...better penetration and grip.

DON'T GO THERE!

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[sstman]

Ive just put the exact same wheels on my 92 coupe, look great, but 'harsher' ride and road noise, and at first the car did not 'feel' as quick??, but they came with as new tyres, and I got them via 'flebay' for £300 ($473) I was pleased.

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[Kim]

From Anchorman - DON'T GO THERE!

I am buying them for the wheels - the snow tires just happen to be on the wheels. I don't drive in snow anyway but I will use them up over the next couple on months in cold weather. I can take the 968 out more and leave the Cayenne home more. No fears.

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[Kim]

on the car

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[rxter]

How about these?

Bolt Pattern: 5x130
Offset: 50 mm front & 47 mm rear
Rim Diameter: 18
Rim Width: 8.0" front & 10.0" rear

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[flash]

no on the rear

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[rxter]

is 10" too wide? So 9" is the limit for the 18s?

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[flash]

no - it's the offset - i have 10s - max offset is 52 <b>IF</b> you have enough camber - too much if you don't - 47 pushes them too far outward no matter what

target 55-60 in a 10

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[rxter]

So these should be good right?

Front 18" X 8" 59 offset
Rear 18" X 9" 53 offset

FRONT TIRE SIZE :245/50ZR18"

REAR TIRE SIZE : 275/45ZR18"

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[flash]

wheels yes - tires no

use the tire rack site to see the outside diameters of the tires - you are targeting 25" front and rear

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[wiseman]

Yea, 2255017 would mount up nice on that 7" rim.

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[aslet]

The tires WILL fit, just change the diameter. This is a decision that the owner has to make. I have larger diameter tires currently. I wanted to wider tire and the larger diameter lowers the rpm's, which I felt would be good for highway use, since the 968 is my DD.

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[rxter]

OK so I think I have finally figured out the math after receiving several boots in the cortex and spending some time on tire rack.

25" X 25.4 mm/? = 635mm max

Formula is like this:

(Tire section width X aspect ratio X 2)+(rim diameter inches X 25.4) = total wheel+tire diameter

I have a spreadsheeted version of this if the admins want to post it. All you have to do is enter the wheel diameter, section width and aspect ratio and voila,

Would be happy to email if anyone is interested send me PM.


Oh, and I almost forgot. For 18s a reasonable option looks like the following

225/35, 225/40 or 235/35 fronts
255/35 rears

These are a good 20 to 30 mm less sidewall than I am running on my stock 16s. Are my kidneys going to be very unhappy with me?

More data.

Wheels are 22 lbs front 24 rear. Tires are about 25 lbs. Is that too heavy? I know that less is better but I'm not made of money so that I can have my hollow-point verbeenium alloys custom spun [img]style_emoticons/<#EMO_DIR#>/wink.gif[/img]

And 1/4" spacers - any problem with that?

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[aslet]

Those weights are about as good as you can get with the sizes. You won't do much better unless you spend a lot of money...

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[flash]

even though it is supposed to work, and an aspect ratio is supposed to represent a percentage of width in height, unfortunately you cannot use math like that on tires - tires vary even within the same size, sometimes as much as nearly an inch in width
just use the tire rack site for specs

a 245/50-18 is roughly 27.6" diameter - no chance that is going to fit properly

a 275/45-18 is roughly 27.7" - same problem

i checked a couple of them and the weight of the front tire is about 30lbs and the rear is about 32lbs

in addition, they are over 10% larger, and would throw the speedo of, and likely disable the ABS

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[rxter]

Agree that the 245s and 2752 are aver the 25" allocation. Interestingly I measured the 205s and 225s that I have on my 16" wheels and teh total diameter looks to be just about 25"

Anyway, these look pretty good.

225/35, 225/40 or 235/35 fronts
255/35 rears

Any thoughts about the short sidewalls?


"These are a good 20 to 30 mm less sidewall than I am running on my stock 16s. Are my kidneys going to be very unhappy with me?"

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[flash]

oem sizes are 25" regardless of wheel diameter - they made it up in profile

what rim diameter?

something to remember: the abs kicks out at i believe a 6% maximum differential from stock diameter, so that would be anything smaller than 23.5 or larger than 26.6

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[rxter]

18s

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