I'm running 195/50R15 Toyos, and Sierra's speedo looks within limits (shows 70 km/h at 65 by GPS). The ride height is also fine, if I set the ride height to 11-12 cm everyone here recommends, the front lower wishbones are angled up a little bit (the wheel side is higher). Also note that with smaller tyres you get the gears shorter by several percent.
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