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I had a tyre failure with my 2007 X3 BMW 2.5 right rear. Drove about 30km with narrow spare, and then replaced both rear tyres with same size as in front but slight difference in height. lower at the back than front. Now I find a surge when gearbox change from 1st to second! What can the cause be? Could it be the tyre height difference?

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No. The tire height has nothing to do with it

Posted on Nov 25, 2013

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SOURCE: Uprating my wheels and tyres

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Posted on Jul 31, 2008

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SOURCE: BMW different tyre profile front and back

Albeit slight, it may affect the speedo reading & ESP/Traction control if fitted.

Posted on Dec 05, 2008

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SOURCE: i have bmw 325i coupe

Turn the ignition on and attach your seat belt. Use the thumb wheel to scroll thru to the tire indicator. Press and hold the button at the end of the stalk(turn signal) for appx. 2 seconds and then release and then press and hold again. It will either have a box that comes up empty that will have a checkmark when the system is initialized or it will say "resetting". At the BMW national website for whatever country you are in you can go there and look at the complete manual and it will state for sure what your vehicle takes to reset.

Posted on Aug 29, 2010

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I have a 2007 X3 BMW 2.5 Automatic BMW and had a blown out tyre on the right rear, forcing me to drive about 30km on the narrow spare wheel. Then fitted 2 10% used tyres to rear, same size but slightly...


For legal reasons the tyres on your vehicle must be of all the same profile . That is for example if you have 195- 75 15 on the car you must have all 195-75 15 on the car. You cannot have 195-75 15 on the front and 195-45 15 on the rear. IT is not just a bit smaller it lowers that rear of the car by 30mm. However it may cause the problem but I would expect it to happen in all gears . I suspect that the engine RPM's ares hanging on a bit and not reducing sufficiently for when the clutch is again for second gear. There is a large ratio change from 1 to 2 and less so for the remainder. Run fault codes to check for idle sensor/ accelerator position problem sensor.;

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I am looking at buying one tomorrow its a 2005 x5 sport what should i look out for?


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This will only come on when a tyre has dropped in pressure (not spare). It work on the principle that a tyre with less air has a smaller rolling circumference and therefore a different wheel speed. This is then monitored against other signals from other wheels and determined that a loss in pressure has occured.

If all tyre pressures seem ok, there could be a chance of a small unoticeable leak and would require a bath test. This is when the tyre is dipped in water and bubbles would appear where the puncture is.

Ultimately the system may just need to be reset, or has incorrectly been reset from a tyre change. For this you just press and hold the TPC button (located on the centre console above the gearstick - looks like a flat tyre with an exclamation) turn on the ignition to position 2 and the light will come on re then yellow,go out, come back on yellow. When it comes back on yellow it re-initializing the system. You can let go of the button and after 20 odd seconds the light will go out for the final time, completing the reset.

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