I went wide on my Mitsubishi, the curvature of the tyre makes it slightly larger diameter/deeper profile than a standard width, so makes the speedo readings slightly more realistic.
In my case I also went for a deeper profile, having gone over all the calculations of how much it would alter the speedo readings.
My speedo now reads 74 when doing 70, and not the 82 it showed before.
I have checked it at all speed using a flat road and gps, and it still over reads slightly throughout the speed range, so all good (on brand new tyres)
Even better, every Mitsubishi dealer or specialist independent employee who has driven it comments on how much better the ride is than standard.
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Just one reason you might fit wider tyres.
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