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post #11 of 12 (permalink) Old 03-17-2019, 05:06 AM
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Originally Posted by Ron Anderson View Post
This was interesting: This winter I installed a cheap ScanGauge readout to get RPM.
What I found out is the Car knows how fast it is going, but the Speedo is lying by +5mph at 70mph.
With the Winter Tire/Rim setup, at a Speedo reading of 75mph, the ScanGauge read 70mph, and so did the phones GPS.
Welcome to SCoA. More speedo discussion here ...

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post #12 of 12 (permalink) Old 03-17-2019, 06:01 AM
Mod ♥ 450/451/453 + Motos
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I've run 195/50/15 tyres on the standard staggered set of 15 inch Genius Darwin wheels for most if my 451's life. They never rubbed. Speedometer was 5 mph optimistic at highway speed.

I now run 185/60/15 on those same wheels. They rub when you're taking a banked turn fast (clover junction), when leaving/entering sloped parking lots, and sometimes on potholes. There's no real damage to the parts they rub and speedometer is right on the dot, even at highway speed.
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