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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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Replying to: ateixeira (Mar 19, 2008 10:49 am) But they are. consider the following: 2008 328xi Sedan offers a $300 upgrade to the Sport Package. Said upgrade includes: - - 17 x 8.0 front, 17 x 8.5 rear; 225/45R-17 front, 255/40R-17 rear run-flat performance tires. 2008 328xi Sport Wagon offers a $300 upgrade to the Sport Package. Said upgrade includes: - - 17 x 8.0 front, 17 x 8.5 rear; 225/45R-17 front, 255/40R-17 rear run-flat performance tires. 2008 328xi Coupe offers a $600 upgrade to the Sport package. Said upgrade includes: - - 18 x 8.0 front, 18 x 8.5 rear; 225/40R-18 front, 255/35R-18 rear run-flat performance tires. 2008 335xi Sedan offers a $600 upgrade to the Sport package. Said upgrade includes: - - 18 x 8.0 front, 18 x 8.5 rear; 225/40R-18 front, 255/35R-18 rear run-flat performance tires. 2008 335xi Coupe offers a $600 upgrade to the Sport package. Said upgrade includes: - - 18 x 8.0 front, 18 x 8.5 rear; 225/40R-18 front, 255/35R-18 rear run-flat performance tires. 2008 535xi Sedan offers a $600 upgrade to the Sport package. Said upgrade includes: - - 18 x 8.0 front, 18 x 9.0 rear; 245/40R-18 front, 275/35R-18 rear run-flat performance tires So, it would seem that every AWD version of the 3-Series and 5-Series save the 528xi can be had with staggered rubber. Go figure. Best Regards, Shipo
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Replying to: shipo (Mar 19, 2008 12:54 pm) I'm thinking that BMWs AWD system may get tweaked when staggered tires are fitted. Either that or the tires have an identical circumference. Otherwise the system would detect the difference in wheel rpm and interpret it as slippage.
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Replying to: roadburner (Mar 19, 2008 1:14 pm) I'll get my handy-dandy circumference calculator out and report back in a few minutes. Best Regards, Shipo |
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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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