per the calculator link above:

a car that came with 185/65x15 tires but is now running 195/65x15 tires, the speedometer would read 2.1% too slow, or when traveling at 61.3 mph your speedo would read 60mph.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)