Correct Euro spec height
05-30-2021, 10:32 AM
#1
Rennlist Member
Thread Starter
Correct Euro spec height
About 12 years ago I had my ‘88 911 Targa lowered to European height. The car was corner balanced. The car has its original 16” Fuch wheels.
Over the next 5-6 years I ran Dunlop Star Spec I Direzza tires. All was fine. I replaced the Star Spec 1’s with Dunlop’s replacement, Star spec 2 Direzza’s. Occasionally the new front tires would rub against the inside lip of the fender. It would slightly bend the lip and put a light groove in the tire.
Just yesterday I put on Continental Extreme Contact sport SL tires which have a different side wall profile than the Dunlop’s. The Continental’s appear to protrude past the lip of the rim while the Dunlop’s sidewall was flatter, more in line with the rim.
I do not see any evidence that they rub but I think the conditions, angle of the wheel, whether the car is on an incline, etc, all have to be in snych for the problem to occur.
Is it possible my car sagged over the years? Can someone please tell me what the correct euro spec height of a component should be that I could measure like the fender or rocker or bumper or something else?
Is rolling the fender an advisable solution or would that ruin the originality of a well preserved original car?
Over the next 5-6 years I ran Dunlop Star Spec I Direzza tires. All was fine. I replaced the Star Spec 1’s with Dunlop’s replacement, Star spec 2 Direzza’s. Occasionally the new front tires would rub against the inside lip of the fender. It would slightly bend the lip and put a light groove in the tire.
Just yesterday I put on Continental Extreme Contact sport SL tires which have a different side wall profile than the Dunlop’s. The Continental’s appear to protrude past the lip of the rim while the Dunlop’s sidewall was flatter, more in line with the rim.
I do not see any evidence that they rub but I think the conditions, angle of the wheel, whether the car is on an incline, etc, all have to be in snych for the problem to occur.
Is it possible my car sagged over the years? Can someone please tell me what the correct euro spec height of a component should be that I could measure like the fender or rocker or bumper or something else?
Is rolling the fender an advisable solution or would that ruin the originality of a well preserved original car?
05-30-2021, 01:14 PM
#2
About 12 years ago I had my ‘88 911 Targa lowered to European height. The car was corner balanced. The car has its original 16” Fuch wheels.
Over the next 5-6 years I ran Dunlop Star Spec I Direzza tires. All was fine. I replaced the Star Spec 1’s with Dunlop’s replacement, Star spec 2 Direzza’s. Occasionally the new front tires would rub against the inside lip of the fender. It would slightly bend the lip and put a light groove in the tire.
Just yesterday I put on Continental Extreme Contact sport SL tires which have a different side wall profile than the Dunlop’s. The Continental’s appear to protrude past the lip of the rim while the Dunlop’s sidewall was flatter, more in line with the rim.
I do not see any evidence that they rub but I think the conditions, angle of the wheel, whether the car is on an incline, etc, all have to be in snych for the problem to occur.
Is it possible my car sagged over the years? Can someone please tell me what the correct euro spec height of a component should be that I could measure like the fender or rocker or bumper or something else?
Is rolling the fender an advisable solution or would that ruin the originality of a well preserved original car?
Over the next 5-6 years I ran Dunlop Star Spec I Direzza tires. All was fine. I replaced the Star Spec 1’s with Dunlop’s replacement, Star spec 2 Direzza’s. Occasionally the new front tires would rub against the inside lip of the fender. It would slightly bend the lip and put a light groove in the tire.
Just yesterday I put on Continental Extreme Contact sport SL tires which have a different side wall profile than the Dunlop’s. The Continental’s appear to protrude past the lip of the rim while the Dunlop’s sidewall was flatter, more in line with the rim.
I do not see any evidence that they rub but I think the conditions, angle of the wheel, whether the car is on an incline, etc, all have to be in snych for the problem to occur.
Is it possible my car sagged over the years? Can someone please tell me what the correct euro spec height of a component should be that I could measure like the fender or rocker or bumper or something else?
Is rolling the fender an advisable solution or would that ruin the originality of a well preserved original car?
front 99+/5mm
rear 37+/-5mm
all others both US and RoW from '76 up w/ the exception of '84 SC/RS and '74 Carrera have the following specs
front 108+/-5mm
rear 16+/-5mm
'74 Carrera is
113+/-5mm
12.5+/5mm
'84 SC/RS is
143+/-5
14+/-5mm
all other '72 -'74 all have a spec of 12.5+/-5mm in back 108+/-5mm in front
Assuming stock 6" ET36 front w/ 205/55 x16 tires it's very unusual for there to be interference at the lip, w/ 7ET23.3 and the same tire it's far more common
yes, it's possible that the bushes or t-bars have sagged, also possible that the front camber is out of whack which could also cause an issue
camber spec is 0° +/-10' but many run a bit more negative for cornering grip enhancement
05-30-2021, 04:50 PM
#3
Rennlist Member
Thread Starter
Thanks Bill. Can you tell me where those measurements are taken?
I just measured the height of the fender thru the center of the wheel. It is 24 5/8”. The rears are 24 3/8”.
Since the front tire didn’t rub but the second set did, I’ll have the camber checked as you suggested. Perhaps it was set wrong with the alignment when the second set of tires were installed.
Does the height suggest the car is sitting too low?
I just measured the height of the fender thru the center of the wheel. It is 24 5/8”. The rears are 24 3/8”.
Since the front tire didn’t rub but the second set did, I’ll have the camber checked as you suggested. Perhaps it was set wrong with the alignment when the second set of tires were installed.
Does the height suggest the car is sitting too low?
05-30-2021, 05:32 PM
#4
Thanks Bill. Can you tell me where those measurements are taken?
I just measured the height of the fender thru the center of the wheel. It is 24 5/8”. The rears are 24 3/8”.
Since the front tire didn’t rub but the second set did, I’ll have the camber checked as you suggested. Perhaps it was set wrong with the alignment when the second set of tires were installed.
Does the height suggest the car is sitting too low?
I just measured the height of the fender thru the center of the wheel. It is 24 5/8”. The rears are 24 3/8”.
Since the front tire didn’t rub but the second set did, I’ll have the camber checked as you suggested. Perhaps it was set wrong with the alignment when the second set of tires were installed.
Does the height suggest the car is sitting too low?
factory method
