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Old August 19th   #1
skibumWRX
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40 vs 45 Ratio Tire on Porsche Cayenne S

I was wondering if anyone knew if they'll be any type of handling difference to put a 40 ratio tire on instead of a 45 ratio tire on a 2004 Porsche Cayenne S. The complete tire size is 275/(40 or 45)/19. OEM is 275/45/19. I just feel if i'm not taking the thing off-roading, why need a 45? Also the air suspension is on the car, so esthetically be that much a difference?
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Old August 19th   #2
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BTW....this is my wife's car..so she doesn't drive it like a spirited driver.
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Old August 19th   #3
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That could possibly mess up some things. It's not a valid plus-sizing. It's right on the borderline. Most recommend staying within 3% of the original diameter so it doesn't affect braking, traction control, speedometer, etc.

The correct plus size is 285/40/20 with a Diameter Difference: 0.8%


Stock Tire - 275/45R19

Section Width: 10.82 in 275 mm
Rim Diameter: 19 in 482.6 mm
Rim Width Range: 8.5 - 10.5 in
Overall Diameter: 28.74 in 729.99 mm
Sidewall Height: 4.87 in 123.69 mm
Radius: 14.37 in 364.99 mm
Circumference: 90.28 in 2293.1 mm
Revs per Mile: 723.7
Actual Speed: 60 mph 100 km/h
Speedometer Difference: -
Diameter Difference: -

Tire 1 - 275/40R19

Section Width: 10.82 in 275 mm
Rim Diameter: 19 in 482.6 mm
Rim Width Range: 9.5 - 11 in
Overall Diameter: 27.66 in 702.56 mm
Sidewall Height: 4.33 in 109.98 mm
Radius: 13.83 in 351.28 mm
Circumference: 86.89 in 2207.0 mm
Revs per Mile: 751.9
Speedometer1: 62.3 mph 103. km/h
Speedometer Difference: 3.896% too fast
Diameter Difference: 3.76%
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Old August 19th   #4
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Wow, I thought I was good with math lol. Or do you have something telling you all this lol
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Old August 19th   #5
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I did it all in my head.

Nah

http://www.1010tires.com/TireSizeCalculator.asp

I do have a Math minor but I try not to use it.
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Old August 19th   #6
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Porsche has specific 'N' ratings for tires so that tires that meet the 'N' spec guaranty that the performance of the vehicle will be within spec. Sure, it's more expensive to get these tires, but performance is what buying a Porsche is all about.

I wouldn't put anything other than 'N' spec tires on it, regardless of what forums, etc say. It's only a few hundred dollars every six months to keep a 5-figure investment in tip-top shape.

You know, this is a great question for Yes Automotive. Where's Josh?
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Old August 19th   #7
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Okay, i found an awesome website www.tiresavings.com, that has the 275/45R19's (Bridgestone Duehler H/P sports) porsche rate N0 for only 70 bucks more than the 275/40R19's i was looking at. yall need to check it out..all their orders are free shipping also.

Quote:
Originally Posted by Samir View Post
Porsche has specific 'N' ratings for tires so that tires that meet the 'N' spec guaranty that the performance of the vehicle will be within spec. Sure, it's more expensive to get these tires, but performance is what buying a Porsche is all about.

I wouldn't put anything other than 'N' spec tires on it, regardless of what forums, etc say. It's only a few hundred dollars every six months to keep a 5-figure investment in tip-top shape.

You know, this is a great question for Yes Automotive. Where's Josh?
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Old August 19th   #8
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Good job. There's always a deal out ther if you look hard enough.
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Old August 19th   #9
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Originally Posted by skibumWRX View Post
Okay, i found an awesome website www.tiresavings.com, that has the 275/45R19's (Bridgestone Duehler H/P sports) porsche rate N0 for only 70 bucks more than the 275/40R19's i was looking at. yall need to check it out..all their orders are free shipping also.
its call www.tirebuyer.com
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Old August 19th   #10
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Originally Posted by Samir View Post
It's only a few hundred dollars every six months to keep a 5-figure investment in tip-top shape.
Calling a Porsche "an investment" makes me feel really good ....now if we could get rid of that nag "depreciation"....all would be perfect!
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Old August 20th   #11
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Originally Posted by skibumWRX View Post
Thank you for the correction.
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Old August 20th   #12
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Calling a Porsche "an investment" makes me feel really good ....now if we could get rid of that nag "depreciation"....all would be perfect!
They're like stocks--they only depreciate if you sell them.
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Old August 20th   #13
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If comfort is key keep the 45 series tires. Going with a lower profile tire will transfer more road vibrations to the vehicle itself making the ride more bumpy or less comfortable.
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