Beware if using the R888R!
09-06-2017, 06:04 PM
#31
I've never run Cup2s or Trofeo Rs but they get very good reviews. The Trofeos will be a more aggressive tire.
If I were you Steffen, I would go with a 245/40 and 315/30 set up for AWD. Compared to the 255/295 combo, the 245/315 is about 1cm taller and the tires will have a higher load rating which is very important, especially with the failure prone Toyos. Being a larger diameter, the 245 will have just as large (if not larger) contact patch as the short 255. Many guys don't realize it as they only focus on tire width, but as you increase the diameter of the tire you are also increasing the contact patch. The taller and wider 315 will clearly have a larger contact patch than the short 295. Any understeer/oversteer concerns can be dialed out with sways. Good luck...
If I were you Steffen, I would go with a 245/40 and 315/30 set up for AWD. Compared to the 255/295 combo, the 245/315 is about 1cm taller and the tires will have a higher load rating which is very important, especially with the failure prone Toyos. Being a larger diameter, the 245 will have just as large (if not larger) contact patch as the short 255. Many guys don't realize it as they only focus on tire width, but as you increase the diameter of the tire you are also increasing the contact patch. The taller and wider 315 will clearly have a larger contact patch than the short 295. Any understeer/oversteer concerns can be dialed out with sways. Good luck...
Never considered 245/315
I will use the 235/315 r888 combo in october at hockenheim racetrack.
For the 245 i will need to use the 8,5 rim with offset ET 40. But that not possible right now, cause its too tight. I use my 8 " rim with offset 50 while using the 235. Thats fine.
09-06-2017, 07:32 PM
#32
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Thread Starter
Thx John.
Never considered 245/315
I will use the 235/315 r888 combo in october at hockenheim racetrack.
For the 245 i will need to use the 8,5 rim with offset ET 40. But that not possible right now, cause its too tight. I use my 8 " rim with offset 50 while using the 235. Thats fine.
Never considered 245/315
I will use the 235/315 r888 combo in october at hockenheim racetrack.
For the 245 i will need to use the 8,5 rim with offset ET 40. But that not possible right now, cause its too tight. I use my 8 " rim with offset 50 while using the 235. Thats fine.
cheers,
John....
09-07-2017, 09:48 AM
#33
Sounds good Steffen. For the 245 you will want an 8.5 but ideally a 9" rim. You should aim for a 45-47mm offset which would help with your clearance issues. 40 is rather aggressive considering you are using numerous LCA shims. A 9" ET 47 with 245s gives you plenty of clearance, actually more than an 8" ET40 with 235s..
cheers,
John....
cheers,
John....
i just checked the tires sizes. I guess with awd the 245/40 wont match with 315/30 or 295/30. The diameter and the rev/mile are too far apart.
Perfect fit is 255/35 + 295/30 or 235/40 + 315/30. No problem with r888 or a052.
Other tires arent possible or exsistant in these sizes.
Would you recommend for the 255/35 although a 9" rim? I guess ET 50 will be tight. ET 55 should be ok. What you think?
09-07-2017, 10:28 AM
#34
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Thread Starter
Hi John,
i just checked the tires sizes. I guess with awd the 245/40 wont match with 315/30 or 295/30. The diameter and the rev/mile are too far apart.
Perfect fit is 255/35 + 295/30 or 235/40 + 315/30. No problem with r888 or a052.
Other tires arent possible or exsistant in these sizes.
Would you recommend for the 255/35 although a 9" rim? I guess ET 50 will be tight. ET 55 should be ok. What you think?
i just checked the tires sizes. I guess with awd the 245/40 wont match with 315/30 or 295/30. The diameter and the rev/mile are too far apart.
Perfect fit is 255/35 + 295/30 or 235/40 + 315/30. No problem with r888 or a052.
Other tires arent possible or exsistant in these sizes.
Would you recommend for the 255/35 although a 9" rim? I guess ET 50 will be tight. ET 55 should be ok. What you think?
Yes, 255 should go on a 9" wheel ideally. 50ET would work, 55 might rub on the coil over as it would be pushed too far in.
09-07-2017, 11:07 AM
#35
The 245/315 is what you want for AWD as the 245 is slightly taller (typically about 5-7mm) that the 315. A 235 on the other will be slightly smaller which is not ideal. The 245/315 has been done a million times on these cars with success.
Yes, 255 should go on a 9" wheel ideally. 50ET would work, 55 might rub on the coil over as it would be pushed too far in.
Yes, 255 should go on a 9" wheel ideally. 50ET would work, 55 might rub on the coil over as it would be pushed too far in.
Lets see:
R888 245/40: 653mm; 1992mm = 808 rev/mile
R888 315/30: 648mm; 1976 mm = 814 rev/mile
We all know 225+295 and 235+315 works just fine.
R888 225/40: 638mm, 1946mm = 827 rev/mile
R888 235/40: 648 , 1976 = 814
R888 295/30: 637 , 1943 = 828
R888 315/30: 648 , 1976 = 814
You see that the 996 TT combo and the 996GT2 setup is supertight.
R888 255/35: 637 , 1943 = 828
As you can see, the 255/35 + 295/30 got the same difference as the 235/40 + 315/30, actually non.
I have not the heart to do the 245 + 315 combo, cause the difference seems to be too big.
The other thing is, the 245/40 is hugh in comparims to the 255/35, which is actually even smaller than the 235/40, which reduces trouble with rubbing on my car.
09-07-2017, 11:31 AM
#36
RL Community Team
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245/40 and 315/30 is the way to go, it almost exactly matches the OEM 225/40 295/30 size staggering. Many many folks here run the 245/315 combo. You want the fronts to be slightly larger diameter than the rear.
09-07-2017, 12:05 PM
#37
Look above and check the numbers.
The rolling circumference and the diameter are totally different.
Its: 1 mm , 3mm and 1 rev/mile for 225+295
Its: 5mm , 16mm and 6 rev/mile for the 245+315
I dont say it doesnt work, but i wont take the risk.
What does match exaxtly is the 255/35 + 295/30. thats like the 235/40 + 315/30 no difference at all.
Considering that the rear tire wears way more quickly, the risk gets even bigger with 245 +315. Instead the 255/35 + 295 gets better and better.
Just my thoughts about that.
09-07-2017, 12:43 PM
#38
RL Community Team
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No it does not match exactly like the 225+295 stock size.
Look above and check the numbers.
The rolling circumference and the diameter are totally different.
Its: 1 mm , 3mm and 1 rev/mile for 225+295
Its: 5mm , 16mm and 6 rev/mile for the 245+315
I dont say it doesnt work, but i wont take the risk.
What does match exaxtly is the 255/35 + 295/30. thats like the 235/40 + 315/30 no difference at all.
Considering that the rear tire wears way more quickly, the risk gets even bigger with 245 +315. Instead the 255/35 + 295 gets better and better.
Just my thoughts about that.
Look above and check the numbers.
The rolling circumference and the diameter are totally different.
Its: 1 mm , 3mm and 1 rev/mile for 225+295
Its: 5mm , 16mm and 6 rev/mile for the 245+315
I dont say it doesnt work, but i wont take the risk.
What does match exaxtly is the 255/35 + 295/30. thats like the 235/40 + 315/30 no difference at all.
Considering that the rear tire wears way more quickly, the risk gets even bigger with 245 +315. Instead the 255/35 + 295 gets better and better.
Just my thoughts about that.
They show a 3 revolutions per mile difference in the OEM sizes and a 6 revolutions per mile difference in the 245/315 sizes. That is almost identical and you don't want the front and rear tires to match exactly. You want the fronts to be slightly larger just like the OEM sizes.
As I said, many many many folks here use the 245/315 combination. No one uses the 255/295 combo.
09-07-2017, 01:24 PM
#39
The tire dealer that I purchase my tires from is showing different specifications than the ones you have listed above.
They show a 3 revolutions per mile difference in the OEM sizes and a 6 revolutions per mile difference in the 245/315 sizes. That is almost identical and you don't want the front and rear tires to match exactly. You want the fronts to be slightly larger just like the OEM sizes.
As I said, many many many folks here use the 245/315 combination. No one uses the 255/295 combo.
They show a 3 revolutions per mile difference in the OEM sizes and a 6 revolutions per mile difference in the 245/315 sizes. That is almost identical and you don't want the front and rear tires to match exactly. You want the fronts to be slightly larger just like the OEM sizes.
As I said, many many many folks here use the 245/315 combination. No one uses the 255/295 combo.
I got my numbers from tirerack for the R888 only.
Do you use R888 too or a different brand?
That could cause the difference in the OEM size.
Anyone knows how much you can move the inner rim to the inside? I am speculating about the ET for a 9" Wheel.
ET 50 would be 13mm more to the inside
ET 47 would be 10mm to the inside.
09-07-2017, 01:55 PM
#40
RL Community Team
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The problem is, that every tire manufacture has different sizes.
I got my numbers from tirerack for the R888 only.
Do you use R888 too or a different brand?
That could cause the difference in the OEM size.
Anyone knows how much you can move the inner rim to the inside? I am speculating about the ET for a 9" Wheel.
ET 50 would be 13mm more to the inside
ET 47 would be 10mm to the inside.
I got my numbers from tirerack for the R888 only.
Do you use R888 too or a different brand?
That could cause the difference in the OEM size.
Anyone knows how much you can move the inner rim to the inside? I am speculating about the ET for a 9" Wheel.
ET 50 would be 13mm more to the inside
ET 47 would be 10mm to the inside.
The RPM figures I listed above are for the R888R. The OEM staggered tire diameters have the larger tire up front for a reason. The AWD system was designed to work that way.
As myself and others have said the 245/315 combo is the way to go. Whether you follow that advice or not is up to you
Last edited by Carlo_Carrera; 09-07-2017 at 02:25 PM.
09-07-2017, 02:47 PM
#41
I have used R888 in the 245/315 sizes on my Turbo.
The RPM figures I listed above are for the R888R. The OEM staggered tire diameters have the larger tire up front for a reason. The AWD system was designed to work that way.
As myself and others have said the 245/315 combo is the way to go. Whether you follow that advice or not is up to you
The RPM figures I listed above are for the R888R. The OEM staggered tire diameters have the larger tire up front for a reason. The AWD system was designed to work that way.
As myself and others have said the 245/315 combo is the way to go. Whether you follow that advice or not is up to you
What rim did you use? size? Offset?
8,5 is ok but 9" is better.
cheers
09-07-2017, 04:52 PM
#42
RL Community Team
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09-07-2017, 06:55 PM
#43
Rennlist Member
This thread is like CNN, MSNBC,CBS,NBC, Washington ComPost, LA Times, NY Times fake news. That stupid "Beware" in the title. So freakin irresponsible & sensationalist.
U could say that about any tire that comes apart at the track. And many do other than Toyo's
U could say that about any tire that comes apart at the track. And many do other than Toyo's
09-07-2017, 07:07 PM
#44
RL Community Team
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What other R compound or race slick has come apart at the track in the past few years? And if they did were they promptly redesigned?
09-07-2017, 07:38 PM
#45
Rennlist Member
Thread Starter
If there appears to be a potential safety issue with a new tire (or any product on the market) that you know about, it would actually be IRRESPONSIBLE if you did not let others know. Nobody is making things up, just sharing what others have posted about actual failures they have experienced on this forum and others. There is absolutely nothing fake about that. Whether you or others want to take that under considerations and consider it when making a tire selection is totally up to each individual and certainly their prerogative. Knowledge is power...