your ....will they fit ....site is almost certainly wrong , presuming your current fitment is OE ...are you sure of that ?
the point is that all speedo's as fitted over read speed , for legal reasons it is important to vehicle manufacturers to ensure that you are never travelling at a higher speed than the speedo indicates ; so the speedo's fitted normally read 5-7% high [ used to be called a grade B speedo ], if a slightly bigger tyre than normal RR wise is fitted it will still over read a little
you, on the other hand , are thinking of fitting a tyre with a smaller RR so it will be 10% or more over reading ; if you are happy with that and it's effect on your fuel consumption shouldn't be a problem ...what the ride will be like on a tyre with a 40% aspect ratio tyre I couldn't say , if I had to guess at the OE size on these wheels I would have said 245 45 18
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