Wider cross section tire on stock IS-F rims?
01-13-11, 03:26 PM
#16
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In other words, the tire height with a particular aspect ratio is not a constant. It is a percentage of the width of the tire and changes (goes up or down) as the width of the tire changes. Thus the width of a 285 or 295 tire with an aspect ratio of 30 is roughly the same height as a 255 tire with an aspect ratio of 35. If we go look at the specs of the Michelin PS2 tire for instance - the OD, Overall Diameter, of a 255/35/19 tire is 26". The 295/30/19 tire is also 26" or exactly the same. Since the stock rear wheel of an F is 10" wide, the 295 tire will not fit (it's too wide). However a 285/30/19 will fit, and the OD of that tire is 25.8" or only .2" shorter than the stock 255 tire.
BTW, I'm running The Continental DW in sizes 245/35/19 in front and 285/30/19 in back with great results.
Lou
BTW, I'm running The Continental DW in sizes 245/35/19 in front and 285/30/19 in back with great results.
Lou
01-13-11, 06:01 PM
#17
^^^^No rubbing issues at all. As far as ride, IMO, they ride better than the stock PS2s (less noise and less reaction to expansion joints). They handle better, the wider front along with the wider rear lets me take turns faster than I could prior to the change. There's lots more traction from a full throttle stop. Again, IMHO, there is absolutely no down side to the DW in the 245/285 front/rear combo.
Lou
Lou
01-14-11, 08:14 AM
#18
Low,
I have PS2 right now and Im thinking of the Contis DW. How do you think the DW would do (performance wise) vs the PS2 considering I will keep the same sizes front and rear?
I have PS2 right now and Im thinking of the Contis DW. How do you think the DW would do (performance wise) vs the PS2 considering I will keep the same sizes front and rear?
01-14-11, 10:53 AM
#19
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Absolute performance isn't a big deal for a track weekend. It's everything in a race.
01-14-11, 12:33 PM
#20
If you're doing track days, they'll be just as good as anything else. If you're racing for trophies or prize money, you'd better buy the Michelins - or whatever is class legal and stickier.
Absolute performance isn't a big deal for a track weekend. It's everything in a race.
Absolute performance isn't a big deal for a track weekend. It's everything in a race.
Or like your sig says, Improve on my driving skills
Last edited by juice14; 01-15-11 at 03:22 AM.
01-15-11, 02:55 PM
#21
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Sorry Lou, but your calcs are wrong. Tire Rack shows the DW turning 811 revolutions per mile and the Bridgestone RE050A for the IS F turning 801. This is a 1.24% difference - even more than the calculated difference using the sizing. So it's more than you think. If resale value is any concern, you're giving away mileage by running a smaller tire. If anything, you'd want slightly larger tires. At least the odometer won't be showing more than actual mileage.
And I did figure out the speedometer/odometer uses only the rear wheels for speed calculations, not the fronts, so front size does not impact speed or distance traveled.
And I did figure out the speedometer/odometer uses only the rear wheels for speed calculations, not the fronts, so front size does not impact speed or distance traveled.
My main concern is fitment w/o having to shave or roll fenders. If (for example) I go with a 265/35/19 Potenza, the section width on the stock 9" rim would be 11.1" with an OD of 26.6". This would make the tire .6" wider and .6" larger in OD. Is there any sure fire way to know if this will fit on a bone stock F other than buying the tires and going for a test drive? Are there other considerations I'm overlooking? Would this slight increase in width even be worth it?
01-15-11, 11:19 PM
#22
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Hi there,
I am running the Michelin PS2 Plus All Seasons in the larger (245/35/19 front, 285/30/19 rear) setup. I have no issues with them at all and the traction in wet is fantastic.
I looked at tirerack.com on the specs compared to stock and I think this whole extra mileage things is a little overblown. The stock rears are 26" OD and the 285's are 25.8" OD. The rev's per mile are 799 vs. 807. That's about 1% more so on 50,000 miles of driving my odometer will read 50,500. Sorry, but I just can't see that making any difference in value.
Anyway, good luck with the tire choice. Nothing like new ones to put a smile on your face!
David
I am running the Michelin PS2 Plus All Seasons in the larger (245/35/19 front, 285/30/19 rear) setup. I have no issues with them at all and the traction in wet is fantastic.
I looked at tirerack.com on the specs compared to stock and I think this whole extra mileage things is a little overblown. The stock rears are 26" OD and the 285's are 25.8" OD. The rev's per mile are 799 vs. 807. That's about 1% more so on 50,000 miles of driving my odometer will read 50,500. Sorry, but I just can't see that making any difference in value.
Anyway, good luck with the tire choice. Nothing like new ones to put a smile on your face!
David
04-24-11, 10:50 PM
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Sorry Lou, but your calcs are wrong. Tire Rack shows the DW turning 811 revolutions per mile and the Bridgestone RE050A for the IS F turning 801. This is a 1.24% difference - even more than the calculated difference using the sizing. So it's more than you think. If resale value is any concern, you're giving away mileage by running a smaller tire. If anything, you'd want slightly larger tires. At least the odometer won't be showing more than actual mileage.
And I did figure out the speedometer/odometer uses only the rear wheels for speed calculations, not the fronts, so front size does not impact speed or distance traveled.
And I did figure out the speedometer/odometer uses only the rear wheels for speed calculations, not the fronts, so front size does not impact speed or distance traveled.
"If anything, you'd want slightly larger tires."
and what would be an example of the above...
What would be the optimal widest tires/wheels and not skew the OD/mi...at least would show less miles than MORE.
Actually, I am a bit more "old school"...and happen to like the look a taller sidewall, more tire and less wheel.
What would be the "tallest-wider tire on say an 18" wheel, instead of a 19"...that would not affect odometer / speedometer much, be?
If you go 1 inch less on the wheel...does that mean you can use, say, a 40 sidewall, as in 245/40 in front & 275/40 on the rear?
To be truthful...I am agonizing over getting rid of my IS-F in favor of a 2012 BMW M3...'cause I cannot stand the narrow wheel/tires of the F...and M3's can have monsters tires...not to mention the wonderful Hi-revving engine and the new DCT tranny...I wish Lexus would put a dual clutch auto-manual in the IS-F...would truly make it faster.
Last edited by 16n69; 04-24-11 at 11:19 PM.
04-24-11, 11:25 PM
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Hi...
"If anything, you'd want slightly larger tires."
and what would be an example of the above...
What would be the optimal widest tires/wheels and not skew the OD/mi...at least would show less miles than MORE.
Actually, I am a bit more "old school"...and happen to like the look a taller sidewall, more tire and less wheel.
What would be the "tallest-wider tire on say an 18" wheel, instead of a 19"...that would not affect odometer / speedometer much, be?
If you go 1 inch less on the wheel...does that mean you can use, say, a 40 sidewall, as in 245/40 in front & 275/40 on the rear?
To be truthful...I am agonizing over getting rid of my IS-F in favor of a 2012 BMW M3...'cause I cannot stand the narrow wheel/tires of the F...and M3's can have monsters tires...not to mention the wonderful Hi-revving engine and the new DCT tranny...I wish Lexus would put a dual clutch auto-manual in the IS-F...would truly make it faster.
"If anything, you'd want slightly larger tires."
and what would be an example of the above...
What would be the optimal widest tires/wheels and not skew the OD/mi...at least would show less miles than MORE.
Actually, I am a bit more "old school"...and happen to like the look a taller sidewall, more tire and less wheel.
What would be the "tallest-wider tire on say an 18" wheel, instead of a 19"...that would not affect odometer / speedometer much, be?
If you go 1 inch less on the wheel...does that mean you can use, say, a 40 sidewall, as in 245/40 in front & 275/40 on the rear?
To be truthful...I am agonizing over getting rid of my IS-F in favor of a 2012 BMW M3...'cause I cannot stand the narrow wheel/tires of the F...and M3's can have monsters tires...not to mention the wonderful Hi-revving engine and the new DCT tranny...I wish Lexus would put a dual clutch auto-manual in the IS-F...would truly make it faster.
04-25-11, 10:53 AM
#26
It seems you are having buyer's remorse. MY suggestion is you trade it in for a 2012 M3. Also, from the your two posts that I accidentally read, I reckon you love M3's.
Be true to yourself, if you love blondes do not go for brunettes to settle..
Be true to yourself, if you love blondes do not go for brunettes to settle..
Hi...
"If anything, you'd want slightly larger tires."
and what would be an example of the above...
What would be the optimal widest tires/wheels and not skew the OD/mi...at least would show less miles than MORE.
Actually, I am a bit more "old school"...and happen to like the look a taller sidewall, more tire and less wheel.
What would be the "tallest-wider tire on say an 18" wheel, instead of a 19"...that would not affect odometer / speedometer much, be?
If you go 1 inch less on the wheel...does that mean you can use, say, a 40 sidewall, as in 245/40 in front & 275/40 on the rear?
To be truthful...I am agonizing over getting rid of my IS-F in favor of a 2012 BMW M3...'cause I cannot stand the narrow wheel/tires of the F...and M3's can have monsters tires...not to mention the wonderful Hi-revving engine and the new DCT tranny...I wish Lexus would put a dual clutch auto-manual in the IS-F...would truly make it faster.
"If anything, you'd want slightly larger tires."
and what would be an example of the above...
What would be the optimal widest tires/wheels and not skew the OD/mi...at least would show less miles than MORE.
Actually, I am a bit more "old school"...and happen to like the look a taller sidewall, more tire and less wheel.
What would be the "tallest-wider tire on say an 18" wheel, instead of a 19"...that would not affect odometer / speedometer much, be?
If you go 1 inch less on the wheel...does that mean you can use, say, a 40 sidewall, as in 245/40 in front & 275/40 on the rear?
To be truthful...I am agonizing over getting rid of my IS-F in favor of a 2012 BMW M3...'cause I cannot stand the narrow wheel/tires of the F...and M3's can have monsters tires...not to mention the wonderful Hi-revving engine and the new DCT tranny...I wish Lexus would put a dual clutch auto-manual in the IS-F...would truly make it faster.
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