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Discussion Starter #1
It seems recently vauxhalls have the uncanny ability to pick an uncommon tyre size, I know there is an issue one of the astra wheel sizes having an odd size tyre, but it seems we walk into the same category with 215/55/18
On my tyres only 8 different tyres are available in this size, 4 of which being nankangs......

Does anyone know at this early stage if a 225 or even 235 are likely to fit? (235 50 18 is closest for overall wheel size compared to standard fit)
 

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Andy, your spot on with 235/50/18
mytres.co.uk shows 70 results
http://www.kouki.co.uk/utilities/visual-tyre-size-calculator
Max 10mm either side cant be rubbing body or wheelarch.


Might ask Insurance co before I did change but according to British tyre manufacturing ass. =
Deviation from Original Fit Tyre
If changing the tyre size from the original fit, ensure the Load Index and Speed Symbol of the replacement tyres are equal to or higher than the original fit tyres . Also ensure the replacement tyre""s rolling circumference is comparable with the original fit tyre. It is advisable to check with the vehicle or tyre manufacturer that the intended replacement tyre is dimensionally possible and an appropriate fit on the vehicle. It is also equally important the tyre and wheel size are compatible.
Conversion guidelines require that, whether using existing or larger diameter wheels, replacement tyre rolling dimensions, load capacity and speed rating match those of the manufacturer approved tyres for the vehicle. A typical example of not applying these guidelines is the fitting of 195/50R15 82V to a vehicle requiring 195/60R15 88V. In this example there is a reduction in load capacity of 85kg per tyre, possibly rendering it overloaded/underinflated, and thus, potentially both dangerous and illegal. Furthermore, the 38mm reduction in overall diameter, and thus rolling dimensions, adversely affects gear ratios, ride height, speedometer reading and can affect ABS, traction control and pressure monitoring systems where applicable.
When changing tyre size from the original fit, it is recommended the vehicle""s insurers are advised and their agreement obtained, otherwise insurance may be invalidated. Fitting of inappropriate tyres will affect the vehicle""s handling, potentially compromise safety and hence render the vehicle illegal.
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Edited by: Blum
 
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