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Sedans Chevrolet Malibu 2008-2009 Chevrolet Malibu
1301 messages, Last post on Nov 24, 2009 at 8:22 AM
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Replying to: rw08malibu (Apr 27, 2008 5:21 pm) Usually, the increased wheel size is offset by a lower ratio tire, giving the outside diameter the same dimension. If that is the case, then technically there is no difference, and assuming the same weight between the 2 wheel types, there shouldn't be a noticable difference in MPG or speedo accuracy. Hope that helps...
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Replying to: busiris (Apr 27, 2008 6:07 pm) |
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Replying to: busiris (Apr 27, 2008 6:07 pm)
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Replying to: rw08malibu (Apr 27, 2008 6:43 pm) That's a potential issue...The 225 is the width of the tire in Millimeters, and the 50 is the % ratio of width to height. So, with no other modofications, expect the speedo to be off a bit.
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Replying to: busiris (Apr 27, 2008 6:48 pm) |
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Replying to: rw08malibu (Apr 27, 2008 7:12 pm) Now, do this 4 or 5 times to have several samples. Now you have enough information to tell you how "off" the odometer actually is, as well as calculate the speed differential between actual speed at, say 60 mph .vs. what is shown on the spedometer. Be aware, though, that it isn't unusual for new cars with everything original to have a variance. The last GM vehicle I had (2005 Aveo) was actually 5-6 mph off at 60 mph. I read several comments about that on the Aveo, but I have no idea how widespread it is on other vehicles, other than I do know it is fairly common. To answer your original question, you can take this information with you to the dealer to help substantiate your complaint, assuming you find a significant difference between actual and reported mileage. I don't think there is an accurate way to estimate the mpg difference, other than trying the same vehicle, driver, and location using both sets of wheels/tires .
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Replying to: busiris (Apr 27, 2008 9:05 pm) |
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Replying to: busiris (Apr 27, 2008 9:05 pm)
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| Does anyone know what is RPM on a 4 cylinder Malibu model at 65-70MPH? Thanks. | |
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Replying to: rw08malibu (Apr 27, 2008 5:21 pm) That said...yes...your speedo, odometer, etc. are all going to be off. Using this calculator: http://www.1010tires.com/TireSizeCalculator.asp There's an overall jump in diameter from the 225/50/17 to 225/50/18 (of course, as the wheel size is larger but the tire width & aspect ratio are the same), going from 25.85in to 26.85in, and effectively throwing off the speedo/odo to be 3.872% slow (or read 57.7 when going 60). The way around this is to reprogram the main computer for the new, larger tire size, but that would require the dealer and their Tech 2 tool. Given that they offer 17" and 18" accessory wheels for the Malibu, regardless of model, the dealer should have the capacity to do this in the case that someone did want 18's on their LT. The difference is relatively big and needs to be taken care of, if they didn't already once the 18's were swapped on.
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