930 spacers
06-17-2011, 09:05 AM
#1
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930 spacers
How large of spacers can you go on a 930?
I see a lot of rims that I like but the offset are too high ...
I know guys use these rims on 930s but how much spacer is too much?
2 inches in the rear?? is this common and more importantly safe?
I see a lot of rims that I like but the offset are too high ...
I know guys use these rims on 930s but how much spacer is too much?
2 inches in the rear?? is this common and more importantly safe?
06-18-2011, 11:01 AM
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hey 964 Speed. My '81 930 have the stock Fuchs on, bvut I do have a '76 911 3.0. It currently has 17" Boxster rims (7 and 9s) on it in order to get the offset orrected I had to use spacers on it 1 1/2 on rerar and 1 on fronts. I've measured the rear of my 930 and found out I would need a 3" spacer to put these same rims on the rear of it. I asked a friend who is an m. engineer thsi sis what he said. If you used spaced to push a std. rim out 3",. then it would place too great a load on ther wheels bearings. (Remember that a 930 rear wheel bearing are just like the fronts
with an inner and out wheel bearing which has to be packed by hand with seals).
He then said since you are not forcing the wheel to extend any further out of the fender area, then the spacer would work on the rear. Remember, there are 17" cup wheels (heavy) that are circulating out there.. these are 7 and 9s...they work on a 911 and 930, even though they appear to have a positive offset, when in fact they do not. Those rims are made with an extended mounting surface (inward)...i.e. they have a built in spacer made into the rims.. I have ordered a 3" spacer to fit these rims on my 930.. I did not order a front spacer thinking that one of othe other spacers I have would work.. I know that some purists think that the only wheel for an older 911/930 are the Fuchs, but I just wanted to try the 17" BBS
boxster wheels on to see what they look like and how they fit....
with an inner and out wheel bearing which has to be packed by hand with seals).
He then said since you are not forcing the wheel to extend any further out of the fender area, then the spacer would work on the rear. Remember, there are 17" cup wheels (heavy) that are circulating out there.. these are 7 and 9s...they work on a 911 and 930, even though they appear to have a positive offset, when in fact they do not. Those rims are made with an extended mounting surface (inward)...i.e. they have a built in spacer made into the rims.. I have ordered a 3" spacer to fit these rims on my 930.. I did not order a front spacer thinking that one of othe other spacers I have would work.. I know that some purists think that the only wheel for an older 911/930 are the Fuchs, but I just wanted to try the 17" BBS
boxster wheels on to see what they look like and how they fit....
06-18-2011, 11:43 PM
#4
Hang on, I'm still reading your first post. 
I don't know the answer to your question. How much is too much? I asked a similar question either on this board or on Pelican and never got an answer.
I suppose the answer would also depend on what kind of driving you're doing. Track driving would put more stress on suspension components (i.e. wheel bearings) than cruising on the boulevard.
There are two issues I'd consider. First is the increased moment arm on the suspension from the spacers, as mentioned above. The other is the weight of the spacers and unsprung mass. Spacers aren't light--they're solid chunks of metal. From a performance perspective, having big spacers is not the way to go.
In the end, I opted for getting a set of wheels made to fit my car without spacers, though obviously that's at considerably higher cost than purchasing a cast OEM wheel from a late-model Porsche.
I don't know the answer to your question. How much is too much? I asked a similar question either on this board or on Pelican and never got an answer.
I suppose the answer would also depend on what kind of driving you're doing. Track driving would put more stress on suspension components (i.e. wheel bearings) than cruising on the boulevard.
There are two issues I'd consider. First is the increased moment arm on the suspension from the spacers, as mentioned above. The other is the weight of the spacers and unsprung mass. Spacers aren't light--they're solid chunks of metal. From a performance perspective, having big spacers is not the way to go.
In the end, I opted for getting a set of wheels made to fit my car without spacers, though obviously that's at considerably higher cost than purchasing a cast OEM wheel from a late-model Porsche.
06-19-2011, 12:39 AM
#5
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Why not just have a set of wheels made with the correct offset. Here is a set I built for a 911 widebody without turbo trailing arms. I can still build an 11.5" to fit with the turbo trailing arms. Jim
jdorociak@gmail.com These are 18" 3 piece Speedline wheels.
jdorociak@gmail.com These are 18" 3 piece Speedline wheels.
06-19-2011, 09:17 PM
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Why not just have a set of wheels made with the correct offset. Here is a set I built for a 911 widebody without turbo trailing arms. I can still build an 11.5" to fit with the turbo trailing arms. Jim
jdorociak@gmail.com These are 18" 3 piece Speedline wheels.
jdorociak@gmail.com These are 18" 3 piece Speedline wheels.
Thanks,
