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05-14-2013, 09:37 PM | #25 |
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What will sit flush an et38 is far from flush if you are talking about the rim being flush with the fender. An et22 is pretty flush with fender the rim that is. That tire is pretty darn wide i bet it will look really nice. Especially a rear shot(no homo)
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05-17-2013, 03:00 PM | #29 | |
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05-17-2013, 03:13 PM | #30 |
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Ok, somebody help me get my brain around some TireRack fitment calculator numbers. Hypo: 10" wide 19" wheel. Old tire is a 255/30 and the new tire is a 275/30. New tire installed in .5" taller than old. Calculator says speedo at 60 will read 61. For some reason this is the opposite of what my brain tells me. I mean, if the new tire/wheel is taller and thus the car travels further with each revolution of the axle, shouldn't the speedo be reading under actual speed rather than over it when the new 275's are installed?
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05-17-2013, 09:48 PM | #31 | |
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Imagine laying out the two treads flat on the ground. The taller tire is longer than the shorter tire. In essence, you have to make the wheel go faster with the taller tire to make one revolution equivalent to the smaller tire. One revolution with the taller tire will seem slower because it is longer. For example, if it takes 5 seconds to make one revolution with the small tire, and it takes maybe 7 seconds on the taller tire at the same tempo or speed, the taller tire must spin faster to match the time it takes the small tire to make one revolution. Thus, when the smaller wheel is going at 60mph, the taller tire, due to its length, must spin faster in order to get it to the same speedo reading as the smaller tire. The speedo reads 60mph with the taller tire, but the car will actually be going 61 mph, compared to the smaller tire. Hope that makes sense.
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05-18-2013, 12:06 AM | #32 | |
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My thinking is that, essentially, the car will cover more distance per revolution of the axle on the taller tires, therfore making it go more miles per hour than the shorter tire when the axles are spinning at identical RPM's. Hence, with taller tires (or a larger overall diameter) the speedo should read 60 when the car is really doing 61. Please tell me how I am wrong here. Last edited by surfcity335i; 05-18-2013 at 12:13 AM.. |
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05-19-2013, 04:49 PM | #34 | |
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So, when the speedo reads 60 mph for the taller tire at the same rpms as the smaller tire, the car would actually be moving at a slower pace, because the damn tire is taller and has longer to go to make one revolution as opposed to the smaller tire.
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05-20-2013, 02:50 PM | #36 | |
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Assume that the rate at which the axle is spinning is the same for both tires (and therefore the speedo reads the same for both because its readout is dictated by wheel speed based upon an assumption of stock setup and not distance traveled). The taller tire will be traveling a further distance per revolution of the axle, right? Therefore, more miles per hour? Someone please come in here and rescue us with some logic. Unless flip4335 has it right and I just can't get my head around it. Conclusion: The Tire Rack Calcualtor is worded wrong and should say: When Speedo Says 60mph, Actual Speed Will Be _______. Last edited by surfcity335i; 05-20-2013 at 03:13 PM.. |
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05-20-2013, 03:23 PM | #37 | |
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This is the same setup i was recommended by two different resellers. However, I have a 2006 330Xi (xDrive)! what's the offset difference in an xDrive model vs RWD? If i get this setup, will there be any rubbing? Please help! note: I will be lowering the car by 1.3" in the front and 1.2" in the rear this weekend. Don't know what to do for tires yet but I want Hankook V12s. |
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05-21-2013, 11:31 PM | #42 |
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