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Discussion Starter #1
I just installed new winter tires on the car. I messed up and ordered the wrong tire size. I got 195/55R15 instead of 195/65R15. This means my tires diametre is 3/4" smaller.

Would anybody know how slower I will go compared to the speed on the speedometer. IE: 130KM on speedo = ???, 60KM = ?, 90, etc

Thanks
 

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3.2% fast
Speedo ---- Actual
100-kph --- 96.8-kph
90-kph ---- 87.1-kph
80-kph ---- 77.4-kph
70-kph ---- 67.8-kph
60-kph ---- 58.1-kph
50-kph ---- 48.4-kph
40-kph ---- 38.7-kph
30-kph ---- 29.0-kph
20-kph ---- 19.4-kph
10-kph ---- 9.68-kph
 

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Discussion Starter #3
NovaResource said:
3.2% fast
Speedo ---- Actual
100-kph --- 96.8-kph
90-kph ---- 87.1-kph
80-kph ---- 77.4-kph
70-kph ---- 67.8-kph
60-kph ---- 58.1-kph
50-kph ---- 48.4-kph
40-kph ---- 38.7-kph
30-kph ---- 29.0-kph
20-kph ---- 19.4-kph
10-kph ---- 9.68-kph
Is the 3.2% for 1 size difference. Because my tires are 2 sizes smaller. Thanks for the fast reply.
 
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