Quote:
Originally Posted by Pinewood
245/45/19=703mm Most tyre specialist advise deviating from this by +/- 2% as an absolute maximum.
235/55/18=716mm so i would say no, as a difference of 13mm will alter the speed and gearing, it may also foul on the cars undercarriage.
The only way you will know for sure is mounting them on the car and going for a test drive
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I've been running similarly oversized tyres for 5 years and 110,000km without any issue. In my case its with 17" wheels where the OEM tyre size was 245/55/17 (701mm) and the replacement tyres have been 235/60/17 (714mm) - ie a similar difference of 13mm.
Yes it puts out both the odometer and speedo by nearly 2% - ie when indicating 100km/h I'm actually doing 102km/h (60mph/61.2mph). So just be aware of this around speed cameras.
Most importantly this does not break our local Australian laws where we are allowed up to a -26mm/+15mm variance from OEM tyre size. Therefore the car remains legally roadworthy and does not impact on either your car insurance or BMW warranty - again at least in Australia. Suggest you at least check what your local laws are.
Alternatively as suggested above, 245/50/18 is an OEM tyre size almost identical in overall diameter to your existing 19" tyres.
Tony