offset...
06-07-2011, 06:48 PM
#16
Instructor
Join Date: Aug 2010
Location: West Palm Beach, FL
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There is a great visual tool for wheel offset for the 911's posted by another Rennlister. It does not apply to the 924/944/968, but it will give you a good idea of the relationship between offset and increasing wheel widths. With a few measurements, we could create a similar chart for the 968. Here is the link:
http://members.rennlist.com/1976c38/index.html
Click on the link and scroll down to the rear wheel fitment chart in the 993 section near the bottom. You can see that offset has to increase as wheel width increases to move the wheel/tire assembly further inboard. Offset is the distance in millimeters from the centerline of the wheel to the wheel mounting surface. If you keep the offset constant (at ET 50 in your case) as you widen the tire/wheel assembly, you move the wheel tire assembly outboard and inboard evenly. The problem is that you have more room on our cars on the inboard side and will rub the fender before you hit the chassis. In order to fit the wider wheels and tires you have to increase the offset ET.
I hope the picture helps.
http://members.rennlist.com/1976c38/index.html
Click on the link and scroll down to the rear wheel fitment chart in the 993 section near the bottom. You can see that offset has to increase as wheel width increases to move the wheel/tire assembly further inboard. Offset is the distance in millimeters from the centerline of the wheel to the wheel mounting surface. If you keep the offset constant (at ET 50 in your case) as you widen the tire/wheel assembly, you move the wheel tire assembly outboard and inboard evenly. The problem is that you have more room on our cars on the inboard side and will rub the fender before you hit the chassis. In order to fit the wider wheels and tires you have to increase the offset ET.
I hope the picture helps.
06-07-2011, 06:51 PM
#17
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Join Date: Oct 2009
Location: one thousand, five hundred miles north of Ft. Lauderdale for the summer.
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i'm surprised the offset isn't working with what you've got.
in any case, don't go any smaller than 275-35-18.....
if they still rub then you can roll the fenders. no worries.
in any case, don't go any smaller than 275-35-18.....
if they still rub then you can roll the fenders. no worries.
06-09-2011, 09:07 PM
#18
Here's the promised pics - 265 / 35s on 10" rear wheels
I'll probably go for 285 / 30s when I need tires but these were on the wheels when I got them. Got to burn them up first.
I'll probably go for 285 / 30s when I need tires but these were on the wheels when I got them. Got to burn them up first.
06-10-2011, 02:30 PM
#19
RL Community Team
Rennlist Member
Rennlist Member
Yeah, those don't look that bad. They looked a little bit more stretched on my dad's combo of wheel and tire.
But it probably was acerbated by the fact it was on a 928. Those cars need a fat tire to look good. Even though a 265 is not a narrow tire, making it look narrow just makes it look bad. Say, what kind of wheels are those? My dad has some aftermarket replica wheel, I don't know the name, that he got with his 964, and I've seen all over ebay. On his, the lip stuck out past the tire, which is what made it look more stretched than your combo. But, it almost looks like you have the same wheel?
Thanks for the pics!
But it probably was acerbated by the fact it was on a 928. Those cars need a fat tire to look good. Even though a 265 is not a narrow tire, making it look narrow just makes it look bad. Say, what kind of wheels are those? My dad has some aftermarket replica wheel, I don't know the name, that he got with his 964, and I've seen all over ebay. On his, the lip stuck out past the tire, which is what made it look more stretched than your combo. But, it almost looks like you have the same wheel?
Thanks for the pics!
