Need a little help on wheel spacers?
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Need a little help on wheel spacers?
Which size wheel spacers would you use to configured the stock 18" carrera wheels to be flush to the fender like the 19" wheels. I know there is a 1" difference in wheel diameter between 18" and 19". So would I use a 1" spacer? Porsche only sells the 5mm spacer. Which doesnt seem that big. There are other companies that sell much larger ones that I could order.
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Originally Posted by Rolf Stumberger
Spacers have nothing to do with wheel diameter.
They are used to offset the wheel farther away from the hub.
Check the WIDTH of your wheel vs. the 19 inch wheels. The difference
is the width of the spacers you want.
They are used to offset the wheel farther away from the hub.
Check the WIDTH of your wheel vs. the 19 inch wheels. The difference
is the width of the spacers you want.
Last edited by golfman; Oct 13, 2006 at 10:55 AM.
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Depends on the offsets involved, see here... http://www.1010tires.com/WheelOffsetCalculator.asp
Plug in the offsets and widths of the 19s vs 18s.
Porsche is very conservative with their offsets on these cars. First thing I did was change to forged wheels with better fitting offsets
Porsche spacers have their own studs and are high quality but expensive. H&R has a line of spacers that are more reasonably priced (and also highest quality)
Plug in the offsets and widths of the 19s vs 18s.
Porsche is very conservative with their offsets on these cars. First thing I did was change to forged wheels with better fitting offsets
Porsche spacers have their own studs and are high quality but expensive. H&R has a line of spacers that are more reasonably priced (and also highest quality)
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Using a Wheel Offset Caculator :
The difference between 18" and 19" are as follows:
Front = the same
Rear = 4 mm narower per side with 18" vs 19"
A 5mm spacer would make the 18" sit 1 mm wider per side
The difference between 18" and 19" are as follows:
Front = the same
Rear = 4 mm narower per side with 18" vs 19"
A 5mm spacer would make the 18" sit 1 mm wider per side
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Originally Posted by MJones
Using a Wheel Offset Caculator :
The difference between 18" and 19" are as follows:
Front = the same
Rear = 4 mm narower per side with 18" vs 19"
A 5mm spacer would make the 18" sit 1 mm wider per side
The difference between 18" and 19" are as follows:
Front = the same
Rear = 4 mm narower per side with 18" vs 19"
A 5mm spacer would make the 18" sit 1 mm wider per side
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This is good timing...I was about to post the same question. I have a C2 which came with the 18"s. I replaced with 19's but kept the 18's for snow tires, which I will be putting on in the next few weeks. I wanted to fill out the wheel wells with the 18's, so it sounds like a 5mm spacer would do it? I presume I could also go a bit wider to enhance the looks without any significant detriment to handling. Anyone have any advice as to how wide (spacer size) is enough/too much?
Thanks
Nigel
Thanks
Nigel
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Originally Posted by MJones
Porsche wheel sizes are listed as follows:
8.5J x 19 RO 56
The last number is the offset
Width and offset are also cast into the wheel at the valve stem area.
8.5J x 19 RO 56
The last number is the offset
Width and offset are also cast into the wheel at the valve stem area.
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Originally Posted by golfman
Ok maybe this is the problem then. I am looking at Tequipment 911 book that has wheel sizes and offsets on stock wheels. It says 18" rear is 10" wide and 58 offset for carrera III wheel and 8" wide front with a offset of 57. It lists the standard 19" carrera S wheels as 8" wide front offset of 57 and rear 11" wide and offset of 67. When you use the calculator on www.1010tires.com do you add to the offset or subtract from it if you use a spacer? I subtracted 5mm from the offset and it shows the 18" would be 1mm extended now. Is that right?
Going from 10" wide with 65mm offset
Going to 11" wide with 65mm offset.
Result:
Inner clearance is 13mm LESS
Outer position is EXTENDED an extra 13mm
Let’s say you want 5mm spacers with the new 11" wheels. The Inner clearance would be 8mm LESS (than the original 10" wheels) and the Outer position would be EXTENDED an extra 18mm (compared to the original 10" wheels).
Hope this helps.
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Nigel - Porsche has used spacers as large as 17mm for factory fitments, which presumably means they have no ill effect on street driven cars. Many feel that spacers should not be used on the track due to extra load on the axles and bearings.
If I were going to add spacers I wouldn't waste time/$ on 5mm ones - it's just not that noticeable. For example - I replaced my Boxster's 19" rear lobster forks with wheels the same width but 13mm lower (meaning farther outboard) offsets and they perfectly match the rear fenders. The front offsets are 7mm lower.
If I were going to add spacers I wouldn't waste time/$ on 5mm ones - it's just not that noticeable. For example - I replaced my Boxster's 19" rear lobster forks with wheels the same width but 13mm lower (meaning farther outboard) offsets and they perfectly match the rear fenders. The front offsets are 7mm lower.
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From: Winston-Salem, NC
Originally Posted by golfman
So you subtract the wheel spacer from the offset. if it was 58 offset withoutthe spacer it would now be 53 with a 5mm offset
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Originally Posted by gota911
Correct!