wheel fit
02-02-2003, 03:06 PM
#2
Rennlist Member
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David,
Wheels have four dimensions that determine what they will fit.
Bolt pattern - the 928 is 5 x 130 mm.
Diameter - you are asking about eighteen inch diameter wheels. Some people have put eighteens on a 928. Eighteens will ride very roughly, and will get bent very easily.
Width - the width of the wheel can make a big difference in whether it will fit or not, especially in combination with offset.
Offset - the offset is the difference between the centerline of the wheel and the mounting surface of the wheel against the hub. The standard offset for the 8" wide stock wheel on an '87 is 52.3 mm.
If you put a wider wheel on, the offset must be adjusted so as to keep the tire from touching the fender or the suspension. Some people have reported using offsets from 52 to 65 mm.
Bottom line - you won't get an answer to your question as asked. It is impossible to answer without knowing the width of the wheel, the offset of the wheel, whether you have spacers on the '87, and probably even the size tire that you plan to use.
If you are considering new wheels, make the vendor tell you whether they will fit, and if he doesn't know, don't buy from him. If they are used wheels, you are pretty much on your own.
Wheels have four dimensions that determine what they will fit.
Bolt pattern - the 928 is 5 x 130 mm.
Diameter - you are asking about eighteen inch diameter wheels. Some people have put eighteens on a 928. Eighteens will ride very roughly, and will get bent very easily.
Width - the width of the wheel can make a big difference in whether it will fit or not, especially in combination with offset.
Offset - the offset is the difference between the centerline of the wheel and the mounting surface of the wheel against the hub. The standard offset for the 8" wide stock wheel on an '87 is 52.3 mm.
If you put a wider wheel on, the offset must be adjusted so as to keep the tire from touching the fender or the suspension. Some people have reported using offsets from 52 to 65 mm.
Bottom line - you won't get an answer to your question as asked. It is impossible to answer without knowing the width of the wheel, the offset of the wheel, whether you have spacers on the '87, and probably even the size tire that you plan to use.
If you are considering new wheels, make the vendor tell you whether they will fit, and if he doesn't know, don't buy from him. If they are used wheels, you are pretty much on your own.
02-02-2003, 04:43 PM
#3
Burning Brakes
While I feel the need to not contridict Wallys obvious 928 experience, I do have a couple of comments.
When you say 18" turbo twist wheels I assume that mean that they have come from a 911 or Boxster of recent vintage. That or they are replicas meant to fit the same cars. IF that is the case, they will bolt right up to your car, no spacers needed.
I also found the ride of my car on 18's and the stock suspension to be perfectly acceptable, and not noticably better on the 17" wheels I switched to. That includes a four state trip home on the 18's. Potholes may be of concern however, there is very little rubber there for protection.
I would follow Wallys advice and find out the specific dimensions of the wheels. If they are intended for any Porsche they will be 5X130mm. You do need widths and offsets though. The 265's will fit in back, plan on 225's in front unless the wheels have a special 928 offset, which is very unlikely in the wheels you describe. Good Luck
When you say 18" turbo twist wheels I assume that mean that they have come from a 911 or Boxster of recent vintage. That or they are replicas meant to fit the same cars. IF that is the case, they will bolt right up to your car, no spacers needed.
I also found the ride of my car on 18's and the stock suspension to be perfectly acceptable, and not noticably better on the 17" wheels I switched to. That includes a four state trip home on the 18's. Potholes may be of concern however, there is very little rubber there for protection.
I would follow Wallys advice and find out the specific dimensions of the wheels. If they are intended for any Porsche they will be 5X130mm. You do need widths and offsets though. The 265's will fit in back, plan on 225's in front unless the wheels have a special 928 offset, which is very unlikely in the wheels you describe. Good Luck
02-03-2003, 04:07 AM
#4
Racer
Join Date: Aug 2002
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David,
Welcome to the Forum. You have asked one of the most frequently asked questions on this and other forums. Unfortunately, there does not seem to be a clear answer on what will and what will not work.
I've done a lot of research on this topic, only to wind up where I began. I agree with all the caveats Wally puts forth. To do it "right," all of those considerations come into play. It is amazing how many factors there are in wheel selection. If you are planning to buy new, I urge you to check out 928 Specialists. They have the best prices and know their stuff.
On the other hand, you will find many 928 owners who have successfully mounted all sorts of sizes on their cars. If it fits, and doesn't rub anything, it's probably OK to use. There may be some adverse affect on your suspension, but it is not likely to cause any great problems.
As you can tell, the fronts are the trickiest.
Whatever you do, search the forum for topics on proper alignment and ride height. These issues go hand-in-hand with wheel replacement.
Good luck!
Welcome to the Forum. You have asked one of the most frequently asked questions on this and other forums. Unfortunately, there does not seem to be a clear answer on what will and what will not work.
I've done a lot of research on this topic, only to wind up where I began. I agree with all the caveats Wally puts forth. To do it "right," all of those considerations come into play. It is amazing how many factors there are in wheel selection. If you are planning to buy new, I urge you to check out 928 Specialists. They have the best prices and know their stuff.
On the other hand, you will find many 928 owners who have successfully mounted all sorts of sizes on their cars. If it fits, and doesn't rub anything, it's probably OK to use. There may be some adverse affect on your suspension, but it is not likely to cause any great problems.
As you can tell, the fronts are the trickiest.
Whatever you do, search the forum for topics on proper alignment and ride height. These issues go hand-in-hand with wheel replacement.
Good luck!