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My 420d xdrive has been experiencing some juddering issues at low speeds, almost as if it is not fuelling correctly. It has just been recalled for work on egr and oil cooler as it is under warranty. However been reading on threads that it can also be the xdrive system if overall wheel diameter isn’t correct, more than a 2% difference. I bought it with aftermarket 20 replicas on.
Current tyres are
225/35/20
275/30/20
How do I calculate the difference between diameter or can you guys recommend tyre sizes? Car has only 10k on clock so dnt Wana be breaking the xdrive 🤦🏼*♂️
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