Testing our the Nitto NT-01's on two nearly consecutive track days
01-07-2007, 10:24 PM
#31
Addict
Rennlist Member
Rennlist Member
Join Date: Dec 2001
Location: SF bay area, CA
Posts: 2,094
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by LVDell
According to the Nitto Website:
Looks like 245/40/18 is for a rim size 8"-9.5" with an optimal rim of 8.5" so we should be great on the 8.5" factory rim
and the 315/30/18 is for a rim size 10.5"-11.5" with the optimal rim of 11" so we should be great on the 11" factory rim
Looks like 245/40/18 is for a rim size 8"-9.5" with an optimal rim of 8.5" so we should be great on the 8.5" factory rim
and the 315/30/18 is for a rim size 10.5"-11.5" with the optimal rim of 11" so we should be great on the 11" factory rim
01-08-2007, 01:39 AM
#32
Addict
Rennlist Member
Rennlist Member
I have definitely heard of the 305 RA-1's rubbing on the rear fenders of the GT3. Others say not, but it's probably borderline without rolled fenders.
01-08-2007, 08:31 AM
#34
Rennlist Member
Originally Posted by karlooz
i recall someone with a gt3 (maybe dc lee?) tried out the 305 toyo ra1s and they didn't fit.
01-08-2007, 10:38 AM
#35
Pro
Join Date: Mar 2005
Location: North Carolina
Posts: 500
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Phokaioglaukos
so I moved down to the 275s.
Have you tried the Nittos? So I gather that you would recommend the 275s as the 315 Nittos would seem to wide?
01-08-2007, 10:44 AM
#36
Nordschleife Master
I am going to check into the tire's width and and inflated diameter and compare to the 295 PS2's I have right now. I have no desire to go DOWN to a 275 from a 295 if I do not have to.
01-08-2007, 10:51 AM
#37
Nordschleife Master
O.K., so here's the spec on the tires:
Michelen PS2's currently on the car:
ID-->25.00 Width-->11.90 Rev/Mile-->832
MPSC (non-shaved):
ID-->25.20 Width-->12.10 Rev/Mile-->833
Nitto 275/35:
ID-->25.55 Width-->10.91 Rev/Mile-->813
Nitto 315/30:
ID-->25.35 Width-->12.60 Rev/Mile-->819
ID=Inflated Diameter
Michelen PS2's currently on the car:
ID-->25.00 Width-->11.90 Rev/Mile-->832
MPSC (non-shaved):
ID-->25.20 Width-->12.10 Rev/Mile-->833
Nitto 275/35:
ID-->25.55 Width-->10.91 Rev/Mile-->813
Nitto 315/30:
ID-->25.35 Width-->12.60 Rev/Mile-->819
ID=Inflated Diameter
01-08-2007, 10:58 AM
#38
Pro
Join Date: Mar 2005
Location: North Carolina
Posts: 500
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by LVDell
O.K., so here's the spec on the tires:
Michelen PS2's currently on the car:
ID-->25.00 Width-->11.90 Rev/Mile-->832
MPSC (non-shaved):
ID-->25.20 Width-->12.10 Rev/Mile-->833
Nitto 275/35:
ID-->25.55 Width-->10.91 Rev/Mile-->813
Nitto 315/30:
ID-->25.35 Width-->12.60 Rev/Mile-->819
ID=Inflated Diameter
Michelen PS2's currently on the car:
ID-->25.00 Width-->11.90 Rev/Mile-->832
MPSC (non-shaved):
ID-->25.20 Width-->12.10 Rev/Mile-->833
Nitto 275/35:
ID-->25.55 Width-->10.91 Rev/Mile-->813
Nitto 315/30:
ID-->25.35 Width-->12.60 Rev/Mile-->819
ID=Inflated Diameter
So the verdict is what for you?
Can we work these 315s?
01-08-2007, 11:17 AM
#39
Nordschleife Master
Considering that the inflated diameter is only .35" more and the width is .7" more I am thinking there should be no problem at all.
Taking into account that the width in only .7" that is not a full .7" on the outside but rather the ENTIRE contact patch and in "rough" math terms that is only .35" extended to the outside (as well as .35" to the inside). So, .35" out and .35" up (ID) I can't see any reason why there would be rubbing issues.
But for the street, I would say no.
Taking into account that the width in only .7" that is not a full .7" on the outside but rather the ENTIRE contact patch and in "rough" math terms that is only .35" extended to the outside (as well as .35" to the inside). So, .35" out and .35" up (ID) I can't see any reason why there would be rubbing issues.
But for the street, I would say no.
01-08-2007, 12:09 PM
#43
Rennlist Member
I have not seen the Nittos. The contact I had with the RA-1 305/35R18s was that the sidewall would touch the fender edge on serious compression, such as when the car got air. The Toyo web site says the 305s have a 12.5" overall width when inflated.
01-08-2007, 12:35 PM
#45
Rennlist Member
Stock ride height: 115 + 5 mm (115 to 120 mm) front and 128 + 5 mm (128 to 133 mm) rear. Rear camber, where the rubbing occurred, was -2°.
At Shenandoah I get air under all four wheels after coming under the bridge at about 120+ mph.
At Shenandoah I get air under all four wheels after coming under the bridge at about 120+ mph.