Question about 2001 BMW 330

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Uprating my wheels and tyres

I have a 330d 2001 bmw and wish to put larger wheels on but I have been told that you have to have different sizes on front and back ?? Can you advise tyre sizes for each ?

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18" 225/40's on the front and 18" 255/35's on the rear

Posted on Jul 31, 2008


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27000km best fuel usage 11.4 L/100 no joy from Mazda Aust. Put 285/70 17 tyres 14.3L/100

Putting different tyres on will alter the accuracy of the speedo and the recording of distance, so I wouldn't pay much attention the fuel economy. For example, a single revolution of the axle will remain constant regardless of the wheel size, but the revolution of the wheel versus distance traveled will vary depending on the diameter of the tyre fitted. If the new tyre was, say 10 cms circumference larger, then the car will travel 10cms further each full revolution (that is 100 meters every 1000 turns. If your speedo sensor is determined by the number of revolutions of the axle, then every 10,000 turns you will have travelled a kilometer more than with the old tyre size (less if the circumference is smaller). The figures you give convert to (UK) 25 mpg dropping to 20 mpg with the new tyres. Does seem poor consumption figures for a small car, but if a big engined truck that might be acceptable. All depends on how you drive it as well.

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The tires currently fitted to the car have the size moulded into the sidewall of the tire.

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Wheel help!

225 = Tyre width
50 = Tyre Height
17 = Size of the wheel without tyres on.

You can go up a size to 18's and I'd suggest 225/40R18 TO GIVE YA A LITTLE EXTRA GRIP BUT THE COMFORT WILL SUFFER A BIT.

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