View Poll Results: What size tires do you run up front (Hoosier R6)
P245/35ZR18
1
25.00%
P245/35ZR18
3
75.00%
P235/35ZR19
0
0%
Voters: 4. You may not vote on this poll
What size front hoosiers do you run?
04-27-2011, 09:51 PM
#2
Burning Brakes
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Location: Ottawa, Ontario, Canada
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First two options are the same....
I went with 245/35/18 after reading all sorts of threads, but haven't used them yet so my opinion is worth zero.
I went with 245/35/18 after reading all sorts of threads, but haven't used them yet so my opinion is worth zero.
04-27-2011, 10:03 PM
#3
245/35 and 245/40 in R6. Some run the 255, not sure what profile. In the R80/100 250/650. I haven't run 235/645, but others have, so I am sure they will fit.
If you are running stock suspension, the 245/35 is the best fit. 245/40 may rub a bit. Well, it did for me.
-td
If you are running stock suspension, the 245/35 is the best fit. 245/40 may rub a bit. Well, it did for me.
-td
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04-27-2011, 10:42 PM
#8
Burning Brakes
Thread Starter
A 996 is 'supposed' to have equal diameter front and rears for the abs. Neither will cause abs to act up but it will change the margin at which it intervenes.
I can't explain how it'll change, only that it will. Us 997 guys have the problem that Porsche decided to use different front and rear diameters and it makes it really challenging to find good matching sets. As a side note, the AWD cars are particularly succeptable to tire diameters.
04-27-2011, 10:55 PM
#9
Burning Brakes
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Actually, in you're running a 315 rear then the difference between the 35 and the 40 series tire is that one has a larger rolling diameter and the other a smaller diameter than the rear tire.
A 996 is 'supposed' to have equal diameter front and rears for the abs. Neither will cause abs to act up but it will change the margin at which it intervenes.
I can't explain how it'll change, only that it will. Us 997 guys have the problem that Porsche decided to use different front and rear diameters and it makes it really challenging to find good matching sets. As a side note, the AWD cars are particularly succeptable to tire diameters.
A 996 is 'supposed' to have equal diameter front and rears for the abs. Neither will cause abs to act up but it will change the margin at which it intervenes.
I can't explain how it'll change, only that it will. Us 997 guys have the problem that Porsche decided to use different front and rear diameters and it makes it really challenging to find good matching sets. As a side note, the AWD cars are particularly succeptable to tire diameters.
The poll shows 245/35/18 as the first two options.... there is no 245/40/18 as a choice.
04-27-2011, 10:59 PM
#10
Burning Brakes
Thread Starter
04-27-2011, 11:22 PM
#11
Actually, in you're running a 315 rear then the difference between the 35 and the 40 series tire is that one has a larger rolling diameter and the other a smaller diameter than the rear tire.
A 996 is 'supposed' to have equal diameter front and rears for the abs. Neither will cause abs to act up but it will change the margin at which it intervenes.
I can't explain how it'll change, only that it will. Us 997 guys have the problem that Porsche decided to use different front and rear diameters and it makes it really challenging to find good matching sets. As a side note, the AWD cars are particularly succeptable to tire diameters.
A 996 is 'supposed' to have equal diameter front and rears for the abs. Neither will cause abs to act up but it will change the margin at which it intervenes.
I can't explain how it'll change, only that it will. Us 997 guys have the problem that Porsche decided to use different front and rear diameters and it makes it really challenging to find good matching sets. As a side note, the AWD cars are particularly succeptable to tire diameters.
FWIW, in the R6, the rolling diameter of the 295 is 25.3 and the 315 is 25.6. The 245/35 is 24.7 and the 245/40 is 25.7. So in reality the 245/40 is more closely aligned with the 315. With the 295, either works and should be within whatever parameters the ABS unit has. Again, I've run 245/40 with both 315 and 295 without issue (other than rubbing).
I'm not sure why the 997 would be different. I find it odd that the 997 crowd would have a challenge matching sets. I don't think there are different ABS control units. But then again, I have a 996, so what do I know.
With respect to AWD cars, GT2/GT3 forum might be the wrong crowd
-td
Last edited by himself; 04-28-2011 at 12:13 AM.
04-27-2011, 11:43 PM
#12
Burning Brakes
Thread Starter
Abs parameters aren't 'soft'. The computer calculates differences in wheel speeds and pulses the wheel that is spinning at a slower speed. Traction is the exact opposite (996 gt3 guys don't need to worry about this). Stability control also uses wheel sensors but also relies on other inputs (yaw, steering and throttle input etc).
If your ABS is designed to kick in when wheel speeds differ by, say 8%, then by using improperly matched tires you've already started to creep into this zone and ABS will activate earlier than needed.
I'm sure this is a little exaggerated, but it is a valid point to consider when choosing tires, especially for a track car when you theoretically never want to get into abs (or worse, dreaded ice mode).
And yes, the 997, silly enough, uses a 26.5 rear with a 25.6 front. 996 came with 25.6 front and rear.
If your ABS is designed to kick in when wheel speeds differ by, say 8%, then by using improperly matched tires you've already started to creep into this zone and ABS will activate earlier than needed.
I'm sure this is a little exaggerated, but it is a valid point to consider when choosing tires, especially for a track car when you theoretically never want to get into abs (or worse, dreaded ice mode).
And yes, the 997, silly enough, uses a 26.5 rear with a 25.6 front. 996 came with 25.6 front and rear.
04-28-2011, 02:33 AM
#13
GT3 player par excellence
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go BIG.
255/35/18 315/30/18
in R80/100
265/645/18 305/645/19
255/35/18 315/30/18
in R80/100
265/645/18 305/645/19
04-28-2011, 08:28 AM
#14
Race Car
