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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 less in height to front tyres. Now I find that from 1st to 2nd the gearbox surges, only between these two. Somebody at BMW said it could be the difference in height between the front and rear tyres, could this be the cause?

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Hi, I wouldn't think it would be the rear tyres. Need a bit more info on "gearbox surges". If it is that your trans is slipping ( reving high but speed is slow ) when engaging second and all of a sudden jerks into gear then you have to readjust throttle cable to gearbox connected to accelerator cable and/or recheck fluid level. It could also be in limp mode which unfortunately has to be reset by by auto sparky.

Posted on Nov 25, 2013

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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.;

Posted on Nov 25, 2013


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