Grip level of 245 versus 225?
#27
Son what is your Alibi?
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Steering response eh well lets consider this;
225/45/18 sidewall is 45% of 225= 101.25
245/40/18 sidewall is 40% of 245= 98.00
245/35/18 sidewall is 35% of 245= 85.75
now IMHO the whole reason your getting "better" feedback is because the 225 is being streched over the rim more and there is less sag in the sidewalls, and therefore less flex. Now the smaller you get your sidewall the better this feedback will get, i think if you went with a 245/35 vs. a 225/45 you would get better feedback with the 245 and more grip.
However to me steering response is not key, finding that middle ground where a marriage exists between the sidewall not folding and the max of grip is key, this is where you'll find the "best" handling.
I suggest GoodYear Eagle F1 GSD3s if you want a streetable tire thats going to last a while with very competitve preformance, RT-615 if you want near the best performance and can afford a new set every 20,000, and the Advan Neova or BridgeStone Re01r if you have the money and can drive the car at the peek of performance (i.e. track)
225/45/18 sidewall is 45% of 225= 101.25
245/40/18 sidewall is 40% of 245= 98.00
245/35/18 sidewall is 35% of 245= 85.75
now IMHO the whole reason your getting "better" feedback is because the 225 is being streched over the rim more and there is less sag in the sidewalls, and therefore less flex. Now the smaller you get your sidewall the better this feedback will get, i think if you went with a 245/35 vs. a 225/45 you would get better feedback with the 245 and more grip.
However to me steering response is not key, finding that middle ground where a marriage exists between the sidewall not folding and the max of grip is key, this is where you'll find the "best" handling.
I suggest GoodYear Eagle F1 GSD3s if you want a streetable tire thats going to last a while with very competitve preformance, RT-615 if you want near the best performance and can afford a new set every 20,000, and the Advan Neova or BridgeStone Re01r if you have the money and can drive the car at the peek of performance (i.e. track)
#28
Purveyor of fine bass
Originally Posted by PoLaK
Steering response eh well lets consider this;
225/45/18 sidewall is 45% of 225= 101.25
245/40/18 sidewall is 40% of 245= 98.00
245/35/18 sidewall is 35% of 245= 85.75
now IMHO the whole reason your getting "better" feedback is because the 225 is being streched over the rim more and there is less sag in the sidewalls, and therefore less flex. Now the smaller you get your sidewall the better this feedback will get, i think if you went with a 245/35 vs. a 225/45 you would get better feedback with the 245 and more grip.
225/45/18 sidewall is 45% of 225= 101.25
245/40/18 sidewall is 40% of 245= 98.00
245/35/18 sidewall is 35% of 245= 85.75
now IMHO the whole reason your getting "better" feedback is because the 225 is being streched over the rim more and there is less sag in the sidewalls, and therefore less flex. Now the smaller you get your sidewall the better this feedback will get, i think if you went with a 245/35 vs. a 225/45 you would get better feedback with the 245 and more grip.
I don't think that these calculations are relevant. Consider a 255/40/18 tire, which would yield 102 for sidewall height. Yet the arguments so far say that a 255 width would cause more roll, so it's not because of the height of the sidewall.
Is it because of the "shape" of the sidewall in relation to the tire width? The stock bridgestones/dunlops cave in below the rim, so the sidewall is diagonally positioned, slanted towards the middle of the tire. So perhaps when a lateral force is applied, and the tread pushes against a sidewall, it ends having to more against the rim (i.e. the force is spread more vertically).
*shrugs*
Since the tire sidewall construction is different, and there are many different factors between different tires, I'm really more interested in the experiential "feel" from particular combinations.
Last edited by Astral; 03-28-2007 at 12:12 AM.
#29
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Sadly this is why tires is so much a black art. Different tires also like different pressure settings and different temperature ranges. Tuning tires is just as important as the right tire selection. I would not more concert information, but for now we can only rely on feedback. I'm surprised at the report that the 245 Azenis felt so soft though, it seems that other people have reported that the Azenis are very stiff.
#30
Son what is your Alibi?
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I accounted for ZoomZoomH's findings with this sentance:
"now IMHO the whole reason your getting "better" feedback is because the 225 is being streched over the rim more and there is less sag in the sidewalls"
Even if the calculation says your sidewall is going to be smaller your still streching a 245 over an 8'' rim vs streching a 225 over an 8'' rim.
You're going to have more sidewall sag even if the sidewall calculation says your going to have a smaller sidewall.
All i'm saying is comparing a 245/35 vs 245/40 vs 225/45 the MUCH smaller sidewall on the 245/35 is going to provide a shaper steering response then a 245/40 making it probably really close to the feel of a 225/45.
However like I said streering response isn't everything.
"now IMHO the whole reason your getting "better" feedback is because the 225 is being streched over the rim more and there is less sag in the sidewalls"
Even if the calculation says your sidewall is going to be smaller your still streching a 245 over an 8'' rim vs streching a 225 over an 8'' rim.
You're going to have more sidewall sag even if the sidewall calculation says your going to have a smaller sidewall.
All i'm saying is comparing a 245/35 vs 245/40 vs 225/45 the MUCH smaller sidewall on the 245/35 is going to provide a shaper steering response then a 245/40 making it probably really close to the feel of a 225/45.
However like I said streering response isn't everything.
#31
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Originally Posted by LionZoo
Sadly this is why tires is so much a black art. Different tires also like different pressure settings and different temperature ranges. Tuning tires is just as important as the right tire selection. I would not more concert information, but for now we can only rely on feedback. I'm surprised at the report that the 245 Azenis felt so soft though, it seems that other people have reported that the Azenis are very stiff.
it is all subjective at this point IMO, just go ahead and get the 245's and see how it feels for you, i've done it and have determined what I like better on the stock rims, experiment people, experiment!
*insert obligatory YMMV notice, lol*
#32
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If I get the Azenis, I'll probably get the 235/40 anyway. The RT615 235/40s are unusually tall and so the speedo difference between that and the 245/40s are minimal. I'll try to contact Falken to confirm that they are indeed that height.
#34
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Originally Posted by fullsmoke
Shouldn't the 235s be shorter than the 245s? Falken makes the 235s taller than what the #s say? Maybe I'm not reading your response right...
FS
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#35
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Wow, that's why it's soo hard to pick tires, isn't that right LionZoo? In mt case i'm going with 245/45 RE-01's. Hopefully I will get them mounted this Saturday. I'll keep you guys updated if you'd like.
#38
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Right, but you're comparing between two different brands. Within the same brand and the same model, the listed dimensions are a fair guide for comparison purposes.
#39
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Originally Posted by LionZoo
Right, but you're comparing between two different brands. Within the same brand and the same model, the listed dimensions are a fair guide for comparison purposes.
#40
Anatomy of a corner...
Interesting, thanks. I am very slightly concerned with the height as that's the thing affecting the speedo. But, I think I have made up my mind and I'm going with the 245/40/18 RT615.
FS
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#41
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Originally Posted by fullsmoke
Interesting, thanks. I am very slightly concerned with the height as that's the thing affecting the speedo. But, I think I have made up my mind and I'm going with the 245/40/18 RT615.
FS
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#42
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The 235/40 is 25.5 tall according to Falken while the 245/40 is 25.6 tall. That's a 0.1 inch difference, 0.2 at most if you take into account rounding error. The height difference is only a couple tenths of a percent while the 235 is 2-3 pounds lighter depending on which literature you believe and possibly a better width for the wheel.
#44
Anatomy of a corner...
Originally Posted by Sisco360
225 front and 245 or 255 on back. Thats what im doing.
FS
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