I calibrated my speedometers by going to 195/75/14 tires on all three of my W123s, above 55 or 60 it still reads a tad high so its not perfect.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"