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Sedans Ultimate AWD Sports Sedans
828 messages, Last post on Oct 03, 2009 at 9:40 PM
You are in the Sedans Forum. Your Hosts are pat & karens
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Okay, here's how diameters lay out for the upgraded SP package tires on the "xi" models: The 328xi Sedan and Sport Wagon: - - 225/45 R17 -- 24.97" (Front) - - 255/40 R17 -- 25.03" (Rear) - - Difference ------ 0.06" The 328xi Coupe, 335xi Sedan and 335xi Coupe: - - 225/40 R18 -- 25.09" (Front) - - 255/35 R18 -- 25.03" (Rear) - - Difference ------ 0.06" The 535xi Sedan: - - 245/40 R18 -- 25.72" (Front) - - 275/35 R18 -- 25.59" (Rear) - - Difference ------ 0.13" I'm thinking that as the worst (from a difference perspective) of the above cars is thirteen-hundredths of an inch, they can be considered virtually identical as far as their overall diameter is concerned.  Best Regards, Shipo |
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Replying to: shipo (Mar 19, 2008 6:06 pm) BTW, what's the difference in performance between 17" and 18" wheels on the 3 series from your point of view? Regards, OW
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Replying to: circlew (Mar 20, 2008 3:26 am)  Best Regards, Shipo
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Replying to: shipo (Mar 20, 2008 3:52 am) Regards, OW |
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Replying to: circlew (Mar 20, 2008 4:00 am) My personal take on it is that anything beyond 17" is simply bling. Best Regards, Shipo |
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Replying to: shipo (Mar 20, 2008 4:14 am) |
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Replying to: shipo (Mar 19, 2008 6:06 pm) I know that Subaru specifies the circumference (2*pi*r = pi*diam) must be within 0.25". So that 535xi is outside of Subaru's tolerances. The difference in circumference would be 0.13" * 3.14 = 0.41". Well over the 0.25" Subaru would allow. The interesting thing is this probably means BMW's AWD system allows for more wheelslip before it would react, i.e. it seems to have looser tolerances for rotational differences from axle to axle.
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Replying to: ateixeira (Mar 20, 2008 12:35 pm) I'd think you could find variances larger than that on new tires of the same model.. You sure the 0.25 inches isn't diameter?
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Replying to: kyfdx (Mar 20, 2008 1:57 pm) That's Subaru's specification, at least. People complain when they blow out one tire (beyond repair), because if you have more than 10,000 miles on your other 3, you need a new set, or you have to shave the new tires to match the others, or find a used tire with similar wear. Most people just buy 4 new tires. |
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Replying to: shipo (Mar 20, 2008 4:14 am) If 17" is an ideal size, does that mean, in your opinion, that if I upgraded from the standard 17" wheels on my 535Xi to the optional 18" wheels and appropriately sized tires (probably non staggered per your comments) that it will not improve the handling of my car? Thanks Bruce
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