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Tyres > Help > Tyres Help > Can I change the size of tyre I am ordering?
Converting to a different size of tyre is possible, but it must be done within strict criteria.
It is important to remember that you will need the diameter to remain as close as possible to the original size.
If the size is too different this affects the time/length it takes for a full tyre revolution (the tyre rolling circumference), which will cause your speedometer to display incorrect readings and your gearing will be adversely affected.
Please do not fit a different sized tyre without first consulting an expert. There are several online conversion sites that can help you. Neither Blackcircles.com or blackcircles.com fitters can be held responsible for any changes made to the size of tyre fitted that lead to issues in terms of performance or damage to the vehicle.