Who actually used 19" Hoosiers + what size?
10-27-2010, 01:09 AM
#1
Who actually used 19" Hoosiers + what size?
Ok, who actually used the 19" Hoosiers on the stock rims? Wondering if you used 235 for the front or can anyone confirm they were able to get the 265 to fit on the front without major modification. If you used the 235 fronts, how was the balance with the 315 vs the 325 rears? Worried if I went with a 235/325 combo, may induce too much understeer. Thanks.
10-27-2010, 04:47 AM
#3
Rennlist Member
Originally posted by FIRST997:
I have collected some data for track tires in 18 (DOT approved) for the porsche 2010-2011 GT3 RS. Below you will find some info about size and weight. Notice that almost all options in 18 inches are heavier than the factory tire (19 inches).
10-27-2010, 09:10 AM
#6
Rennlist Member
NJ-GT is pretty much Tire guru around here, he fit 265 on his '07RS and I am pretty sure they will fit on '10RS as well with -2.8 or more comber front. I fitted 255 front on my '07GT3 and '10 RS and the RS has plenty of room to spare. I just felt that 255 was plenty, my cars never push.
10-27-2010, 10:54 AM
#7
Race Director
255-35-18 fit on my 07 Carrera S no problem for the front.
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10-27-2010, 11:22 AM
#8
Addict
Rennlist Member
Rennlist Member
The 235 and 265 Hoosier A6/R6 have the same width, the 265 is just taller (something you don't need for the light front axle). The 315 and 325 are the same width as well, but the 325 is taller. Don't trust the specs from the Hoosier website, they are not accurate.
I have used all the available sizes of 19" Hoosier A6 (R6 is just a harder compound), 235, 265, 295, 315, 325, 345. I measure them off and on the wheels, and keep the data.
The 235 Hoosier is actually a 255 tire, the 265 is also a 255 tire (not always Hoosiers are wider). Now the 255/35R18 that's one very wide tire, it really is a 275/30R18.
You should run 235 and 325 R6 (high speed tracks) or 235/315 for short tracks, autoX, ProSolo, etc. The 235 is wider than the stock RS 245 MPSC, and the 325 is narrower than the stock RS 325 MPSC, so less understeer.
Personally, I would run 18", get front 10"x18" proper offset wheels and fit 285/30R18, 335/30R18 at the back for short tracks, and 345/35R18 for high speed tracks.
I have used all the available sizes of 19" Hoosier A6 (R6 is just a harder compound), 235, 265, 295, 315, 325, 345. I measure them off and on the wheels, and keep the data.
The 235 Hoosier is actually a 255 tire, the 265 is also a 255 tire (not always Hoosiers are wider). Now the 255/35R18 that's one very wide tire, it really is a 275/30R18.
You should run 235 and 325 R6 (high speed tracks) or 235/315 for short tracks, autoX, ProSolo, etc. The 235 is wider than the stock RS 245 MPSC, and the 325 is narrower than the stock RS 325 MPSC, so less understeer.
Personally, I would run 18", get front 10"x18" proper offset wheels and fit 285/30R18, 335/30R18 at the back for short tracks, and 345/35R18 for high speed tracks.
10-27-2010, 11:33 AM
#9
Rennlist Member
The 235 Hoosier is actually a 255 tire, the 265 is also a 255 tire (not always Hoosiers are wider). Now the 255/35R18 that's one very wide tire, it really is a 275/30R18.
255 = really 275
235 and 265 = really 255
It would make sense I ran 255 and 335 and had TONS of front grip.
10-27-2010, 06:00 PM
#10
tires size
Hey John
Definitely 235/35/19 x 315/30/19. Perfect fit and balance. The 235 in the 19" is very close in width to the 245 in the 18".
I also was able to run 255 and 265 on the front of my car, but in the 18" tires.
Good luck.
Definitely 235/35/19 x 315/30/19. Perfect fit and balance. The 235 in the 19" is very close in width to the 245 in the 18".
I also was able to run 255 and 265 on the front of my car, but in the 18" tires.
Good luck.
10-27-2010, 08:34 PM
#12
Burning Brakes
I've got a set of 235/315 19" hoohoos next to me as I type this.
I was happy with the grip of the car and I'm pretty confidant that you don't need to change anything to keep the balance in the car. I believe that it's not as simple as adding tire width to balance a car because there are too many other variables.
When you're dealing with a set of tires as sticky as hoosiers there will typically be WAY more in the tire than most mortals will be able to extract.
I know a guy who currently gets speeds out of street tires that are only 2 seconds off the times he gets on R6s on a 5KM track.
As an aside on hoosiers and 19" rims, what I've learned running through 3 different sets of 19" tires at the track this year is that you can't use the same alignment specs as the 18" guys. The 19" tires rolls less (particularly the hoosiers, the sidewalls practicaly solid!) and therefore needs less neg camber for full contact patch. Stiffer springs are also a good idea when moving up to the hoosiers as you'll really start to feel it!
Just my opinion though.
I was happy with the grip of the car and I'm pretty confidant that you don't need to change anything to keep the balance in the car. I believe that it's not as simple as adding tire width to balance a car because there are too many other variables.
When you're dealing with a set of tires as sticky as hoosiers there will typically be WAY more in the tire than most mortals will be able to extract.
I know a guy who currently gets speeds out of street tires that are only 2 seconds off the times he gets on R6s on a 5KM track.
As an aside on hoosiers and 19" rims, what I've learned running through 3 different sets of 19" tires at the track this year is that you can't use the same alignment specs as the 18" guys. The 19" tires rolls less (particularly the hoosiers, the sidewalls practicaly solid!) and therefore needs less neg camber for full contact patch. Stiffer springs are also a good idea when moving up to the hoosiers as you'll really start to feel it!
Just my opinion though.
10-28-2010, 05:48 AM
#13
Rennlist Member
So will the 235/315 combo fit under the guards of a 2010 gt3 also (non RS)??? or would I have clearance issues with the rear???
10-31-2010, 03:05 AM
#15
345 clears the rear of the '10 RS
Hoosier R6 -- doesn't overload PASM, but does require (much) more precise control inputs to avoid PASM aka SC/TC intervention. As ever, when SC/TC intervenes on a 2010 RS, it's a driver problem. : ) That's not to say faster or slower overall, though the pro drivers comment they can't put down faster times with the safeties disabled.