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Old October 3rd, 2008, 10:51 PM   #1
Binder Gill
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Techart wheels 18"

I just purchased 18"techart wheels formula, currently rear rims have 285/30/18 front 225/40/18 these are run down corsairs. I am thinking of going with 275/35/18 for the rear rims and 235/40/18 for the front. Any concerns.

Also with the rear rim being 10.5" there does not appear to be too much space between the strut and rim possible 3/16" -1/4". Is that too close, no signs of rubbing.
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Old October 4th, 2008, 11:56 AM   #2
boxs2000
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I have 275's on my car with no rubbing issues and my car is lowered (no spacers). Check your offset I cant remember what mine are...
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Old October 4th, 2008, 04:09 PM   #3
Westcoaster
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Quote:
Originally Posted by Binder Gill View Post
I just purchased 18"techart wheels formula, currently rear rims have 285/30/18 front 225/40/18 these are run down corsairs. I am thinking of going with 275/35/18 for the rear rims and 235/40/18 for the front. Any concerns.

Also with the rear rim being 10.5" there does not appear to be too much space between the strut and rim possible 3/16" -1/4". Is that too close, no signs of rubbing.
For comparison:

I recently bought a set of Cayman S 18" wheels, they came with the OEM rubber as well, front wheels 8" wide 57mm offset with 235/40-18 tires, rear 9" wide 43mm offset with 265/40-18 tires.

On the fronts, there is only about 4-5mm clearance between the tires and the strut, out back it's a bit larger closer to 14mm.

Depending on the offsets and wheel width it can be close, the largest wheel Porsche puts out back is 10J x 19, RO 42 and the widest tire 265/35 ZR 19.
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Old October 4th, 2008, 08:39 PM   #4
Binder Gill
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Silly question how do I check the offset.
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Old October 5th, 2008, 07:14 AM   #5
The Voxster
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Originally Posted by Binder Gill View Post
Silly question how do I check the offset.
The 18" Techart Formulas only comes in two offsets in the rear: 40mm and 50mm. For a Boxster application, the 40mm version is EXTREMELY aggressive, not recommended, and quite rare. If I remember correctly, TechArt wheels have no offset markings on them, so I think the only way to tell is to find the centerline and measure them.

Measuring the offset of a wheel is easy. Put a soft cloth down on your garage floor and lay the wheel flat, facing up.

Determine the centerline of the wheel by taking the wheel width and dividing by two;

Overall width (in your case, 10.5")/2 = Centerline

After determining the centerline, measure from the mounting surface to the edge of the inboard flange (with the wheel laying flat on the ground - face up - your measurement would be from the ground to the mounting surface). This is your back spacing. Centerline - Back Spacing = Offset in Inches

And then convert to metric:
Inches x 25.4 = Offset in mm

It's very likely you have the 50mm version however, because they are far more common, but it never hurts to check. If you DO have the 50mm version (assuming your car's not lowered) you won't need spacers and you shouldn't have any rubbing issues with these wheels... they're made specifically for Porsches and that offset is perfect. If you have the 40mm version, you may very well have rubbing issues and/or the rears sticking too far out of your wheel wells, and you may want to consider having your fenders rolled to prevent damage.
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Old October 7th, 2008, 07:17 PM   #6
macsak
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look on the rim, it should be on there on the outside, a number followed by ET

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