2work
Well Known Member
The rpm is nothing to do with it as if your car is remapped that would be different anyway and 195/55 would actually make it more out as although 10mm wider has a smaller depth of sidewall than 185/60 and therefore a smaller rolling circumference.
You need to check your actual speed against gps maybe on your sat nav ?
Morning,
Perhaps I should have given a little more detail in my earlier post as I have indeed checked the instrument cluster speed verses a GPS tracking speed.
With my A2 sat on 185/60/15 Dunlop BluResponse I have observed the following:
@30mph the GPS device is showing 24mph
@60mph the GPS device is showing 55mph
@70mph the GPS device is showing 65mph
The above figures are rough and could well be 1-2 mph out as this is just from observations. It seems I’m travelling safely and shouldn’t get caught out by speed cameras, but it is not helping out calculating my MPG correctly.
I’d happily change them to 195/55 in the future but would first need to see this profile tyre on an A2 with sport suspension.
Has anyone got similar images to that shown above but on sport suspension.
Kind regards,
Tom