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Originally Posted by ricky.agrawal
Tire from what I remember isn't that big of a deal weight wise when you're talking about extending another 10mm wide and another percent or two in aspect ratio.
Most of your weight anyways would come from the after market rims. Remember rotational intertia from Physics? You'd be a lot better off saving a few pounds off your wheels (because it's a lot easier there).
Another thing I'm sure you've thought about but forgot to mention is overall aspect ratio versus stock. Try to keep the same overall total rolling diameter. If you run different sizes it might mess up the AWD on the X5 (I read about 4Matic units getting messed up from folks running staggered setups, I'm not sure how the AWD is setup on our car, but I'd rather play safe than not..)
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You are 100% correct, my friend!
According to the specs, the 20" 295/40s that I'm looking at are 4 lbs heavier per tire than the 275/40s... but they're the same exact weight as the 315/35s. So overall, not that much difference - but the fronts would have an additional 4 lbs per tire more rotational weight, plus whatever the weight difference between a 9.5" and 10.5" OEM style #87 front rim would be... I don't really know if that would make a noticable difference or not (?)
And regarding the overall rolling circumference, I agree that it's a very bad idea to mix sizes that are more than a hair different on the AWD X5. (If I go with 295/40s, it would be all the way around). But regarding the overall size, the typical 295/40-20s (which have a 92" rolling circumference) are a little bigger than the stock sizes, but they're actually closer to stock 255/55-18s (91.2"), and the stock 255/50-19 & 285/45-19 combo (91.2/91.4") than they are to the stock 275/40-20 & 315/35-20 combo (90/90.1"), which is probably the most popular upgrade for us non-4.6/4.8 drivers...
My only concern was fitting 10 or 10.5 inch wheels up front with 295s mounted to them. But if there's no rubbing or other problems associated with this, then I'm all for it!!
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Originally Posted by Josh4.6
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That is a good calculator. I created a similar calculator in Excel, but if I'd have known that this one was out there, I probably wouldn't have bothered!
With mine, though, I plug in the exact manufacturer specs for a specific tire (factoring in the 'measuring rim' size) to get precise results, as some tires do vary a little from manufacturer to manufacturer even within a give size/aspect ratio... Admittedly, probably not necessary, but it floats my boat, I guess
