5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
Another useful site for comparing BMW rims is Felgen-Katalog - BMW-Treff - der Treffpunkt für alle BMW-Fans und -Fahrer it will allow you to see the details of your current wheels (if they are genuine), and you can use this information to evaluate the alternatives that you are considering. Pay particular attention to the offset value. The 5 & 7 series are typically +16 to +24, and alot of other models are +36 to +44.
It all comes down to the rolling diameter of the tire, if you maintain (roughly) the stock diameter by changing the profile as you go up through the sizes your performance (acceleration, fuel economy and top speed) will remain the same, and you speedo with retain its accuracy, but if you change the rolling diameter then other variable will also change. The Tire Size comparing tool above will show the impact of changing tire diameters as a % relative to the original tire.
I went from 235/60/16 to 275/40/19 (rear) on my car with a 2.2% change in total diameter, but it really didn't impact noticably in the parameters mentioned earlier. So keep within reasonable range of the original and you should be ok. Use the tool to thoroughly investigate your options before putting your hand in your pocket and pulling your wallet out.
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