Tyre size - speedo accuracy?

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I currently have 235/40/18 tyres which are coming to the end of their life. I think the speedo reads approximately 8-9% faster than the real speed and I know my wheel / tyre circumference is a little smaller than the 215/60/16 stock tyres. Im thinling of going to 245/45/18 which I think will make the speedo pretty close to correct and look marginally better - which isnt really a concern. 

245 will be fine on my rims.

Has anyone fitted this size? Any issues?


Will tyre shops care what size I want? Is it likley that they will not want to fit these larger tyres for any reason? Would they see is as a mod that they could be lible for?


I would love to hear about any relevant experiences 

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