Quote:
Originally Posted by jakeb1
However, whilst the winter tyres were stopped, the control summer tyre was still doing 20mph.
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...and busy ploughing into the car in front
Regards speedo reading, I assumed that a winter tyre would have the same rolling radius as the equivalent summer tyre?
Quote:
Originally Posted by HighlandPete
Yes, it's all about tyre sizing.
For example I'm reading that users are fitting winter wheels off of E9x models to the F30/31 and saying no 'fitting' issues. But the tyre profiles are different, so there will be speedo error.
Also some fit narrow tyres for the winter and forget they also need to change aspect ratio, to keep the correct tyre RC. For example a car with a 245/45 R18 summer wheel will need a 225/55 R17 if going for the narrow but smaller rim winter tyre.
A lot of X3 drivers are putting very strange size tyres on their models, because of tyre availability or cost. Not matching the RC at all.
HighlandPete
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Ah yes, I can see how changing size would do it. Kind of got the impression from the Autocar review that they'd be using the correct sized tyre.