18 inbch wheels on 964?
#1
Burning Brakes
Thread Starter
18 inbch wheels on 964?
I was considering 18 inch wheels on a 964 C2, and remember reading (I think it was Streather) that you should never put 18s on a 964
I am running 17 inch turbo twists and have a set of 18 inch as well
Is there a suspension modification for 18s / some advantage to 18s or will I die in a horrible ball of fire as a result of putting 18s on my 964
I am running 17 inch turbo twists and have a set of 18 inch as well
Is there a suspension modification for 18s / some advantage to 18s or will I die in a horrible ball of fire as a result of putting 18s on my 964
#2
With respect to running 18's on a 964, my car came with 18 inch wheels and I have tracked the car for the last 4 years in these RH replica wheels. In fact this past week-end at Sebring, I was on Toyo R-888's because of several recommendations on this forums....and they were right....I had a BLAST on the new tires. I have had no issues with 18's other than the additional cost.
MWN
MWN
#3
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Same here - I run 18s on the track with MPSCs and Hoosiers. My street wheels are the 17s with street rubber. No issues from me.
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Last edited by swftiii; 03-03-2011 at 04:18 PM.
#4
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AFAIK,
as long as diameter of TIRE is roughly same as stock and you don't rub the tires anywhere you can use any size rim you want. Otherwise those lowered Neon's with 22's and big exhausts would be bursting into flames.
However, others may correct me.
( I run 18s in the summer time with no apparent problems)
as long as diameter of TIRE is roughly same as stock and you don't rub the tires anywhere you can use any size rim you want. Otherwise those lowered Neon's with 22's and big exhausts would be bursting into flames.
However, others may correct me.
( I run 18s in the summer time with no apparent problems)
#5
Burning Brakes
Thread Starter
Sounds like the 18s are the wheel of choice on the track...I dont track the car ..only reason I changed wheels was those dreadful "style" 90 Phone dial wheels
So there is no real advantage to going with 18 inch (I am happy with the 17 inchers) unless I want to compete with the hondas and neons .. still wonder why Streather warned against 18 inch wheels on a 964
So there is no real advantage to going with 18 inch (I am happy with the 17 inchers) unless I want to compete with the hondas and neons .. still wonder why Streather warned against 18 inch wheels on a 964
#6
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I think it is a bit like your mom saying "don't go swimming for at least 1 hour after you have eaten". One of the advantages of 18" wheels are your increase in tire choices; the only disadvantage I have heard of is a bit rougher ride on the road, i.e. lower aspect ratio. You may also have rubbing issues depending of offset, tire choice and camber settings.
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#8
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I think it is a bit like your mom saying "don't go swimming for at least 1 hour after you have eaten". One of the advantages of 18" wheels are your increase in tire choices; the only disadvantage I have heard of is a bit rougher ride on the road, i.e. lower aspect ratio. You may also have rubbing issues depending of offset, tire choice and camber settings.
#9
I have 18s the only issues are with clearances especially if you are lowering the car... but then for lowering camber adjustments and rolled arches cure those problems.
My question however is doesn't running bigger wheels affect the speedometer and gears? Or is this negligible?
My question however is doesn't running bigger wheels affect the speedometer and gears? Or is this negligible?
#10
Rennlist Member
Only if the rolling circumference changes. I think you'll notice when 18's are put on, the tires tend to be lower profile, meaning less sidewall, and if the circumference stays the same, it won't affect the speedometer. It's that 2 digit number (like 35, 45, etc.) in the tire nomenclature, which means the sidewall is 35% or 45% of the width of the tread. Forgive me if I'm stating the obvious.
I've heard somewhere that the 18's stress the undercarriage more...I think it was mentioned pertaining to 993s.
I've heard somewhere that the 18's stress the undercarriage more...I think it was mentioned pertaining to 993s.
#12
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"..........only reason I changed wheels was those dreadful "style" 90 Phone dial wheels............."
Heyyyyyy... (see the avatar) You can see I have no experience with this, but you might want to at least look at:
http://www.pcarworkshop.com/images/d...0593geolab.pdf
This PCNA Technical Bulletin says "Retrofitting 18" wheels on Porsche vehicles which do not have 18" wheels as original equipment is NOT ALLOWED." While this was a technical issue back in 1993, everyone with 18" wheels here yells BS every time it's brought up. You might want to consider following the guidelines for upgrading to 17" wheels by fitting the improved caster mounts.
Now, everyone can restate, "Don't worry, it'll be fine...........
Heyyyyyy... (see the avatar) You can see I have no experience with this, but you might want to at least look at:
http://www.pcarworkshop.com/images/d...0593geolab.pdf
This PCNA Technical Bulletin says "Retrofitting 18" wheels on Porsche vehicles which do not have 18" wheels as original equipment is NOT ALLOWED." While this was a technical issue back in 1993, everyone with 18" wheels here yells BS every time it's brought up. You might want to consider following the guidelines for upgrading to 17" wheels by fitting the improved caster mounts.
Now, everyone can restate, "Don't worry, it'll be fine...........
#13
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http://www.pcarworkshop.com/images/d...0593geolab.pdf
This PCNA Technical Bulletin says "Retrofitting 18" wheels on Porsche vehicles which do not have 18" wheels as original equipment is NOT ALLOWED." While this was a technical issue back in 1993, everyone with 18" wheels here yells BS every time it's brought up. You might want to consider following the guidelines for upgrading to 17" wheels by fitting the improved caster mounts.
This PCNA Technical Bulletin says "Retrofitting 18" wheels on Porsche vehicles which do not have 18" wheels as original equipment is NOT ALLOWED." While this was a technical issue back in 1993, everyone with 18" wheels here yells BS every time it's brought up. You might want to consider following the guidelines for upgrading to 17" wheels by fitting the improved caster mounts.
And now that these cars are 20+ years old we should probably be fitting 15's on so as to stress the frames and bolts less. (Obviously those Neons are much better built to handle the stresses of the big wheels)
#15
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"..........only reason I changed wheels was those dreadful "style" 90 Phone dial wheels............."
Heyyyyyy... (see the avatar) You can see I have no experience with this, but you might want to at least look at:
http://www.pcarworkshop.com/images/d...0593geolab.pdf
This PCNA Technical Bulletin says "Retrofitting 18" wheels on Porsche vehicles which do not have 18" wheels as original equipment is NOT ALLOWED." While this was a technical issue back in 1993, everyone with 18" wheels here yells BS every time it's brought up. You might want to consider following the guidelines for upgrading to 17" wheels by fitting the improved caster mounts.
Now, everyone can restate, "Don't worry, it'll be fine...........
Heyyyyyy... (see the avatar) You can see I have no experience with this, but you might want to at least look at:
http://www.pcarworkshop.com/images/d...0593geolab.pdf
This PCNA Technical Bulletin says "Retrofitting 18" wheels on Porsche vehicles which do not have 18" wheels as original equipment is NOT ALLOWED." While this was a technical issue back in 1993, everyone with 18" wheels here yells BS every time it's brought up. You might want to consider following the guidelines for upgrading to 17" wheels by fitting the improved caster mounts.
Now, everyone can restate, "Don't worry, it'll be fine...........