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The R129 300SL's came originally with 225/55-16 tires.
Twisting the stem of the speedometer needle changed the displayed speed on the older models with the Speedo cables. I doubt that anyone has messed with the speedometer needle on your car (you can check this by taking out the dash cluster; the cluster-parts have to be sealed with a sticker).
Personally I don't think there is a way to calibrate the speedometer...but I am not a mechanic!
greetingz,
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1990 300SL-24
1993 C250D with a minor 600+k kilometer
www.MBenzNL.com(the Netherlands)
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