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Originally Posted by REN69
Yeah but the tire also has an extra half inch on the sidewall, which means your speedo is now off by about 5kph. Had you know this you would have chosen 205/60-15 and you would have caused no difference in speed.
Rule of thumb is.. you go up 1 measure in width and down one in height.. so for example
a 185/60-14 tire could be replaced by a 195/55-14 tire
a 195/65-15 tire could be upped to a 205/60-15 and cause no change on your speedo.
btw I'm from Canada, but I'm not telling you this because its better for snow.. its because its the way its supposed to go. If you had asked for snow tire sizes I would have suggested 185/70-15's cause yeah, the thinner the tire the better you handle in snow.. look at the WRC cars.. they use very skinny tires in snow. 
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Better get your info right before posting Bling Bling Bling Bling
Radd Guy
Bling Bling-->"a 195/65-15 tire could be upped to a 205/60-15 and cause no change on your speedo"
WebCars! Tire/Wheel Compensation Report
The circumference of the P195/65 x 15 original tire is 78.4779 inches
The circumference of the P205/60 x 15 aftermarket tire is 77.5502 inches
Your speedometer reading is 101.% of your true speed.
The ratio of your old vs. new tires is 1.01.
The current differential ratio is:
To retain the same overall gear ratio, you will need a differential with a 0 ratio.
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Without correction, your speedometer error will be:
Indicated speed: 10 mph. Actual Speed: 9.88 mph.
Indicated speed: 15 mph. Actual Speed: 14.8 mph.
Indicated speed: 20 mph. Actual Speed: 19.7 mph.
Indicated speed: 25 mph. Actual Speed: 24.7 mph.
Indicated speed: 30 mph. Actual Speed: 29.6 mph.
Indicated speed: 35 mph. Actual Speed: 34.5 mph.
Indicated speed: 40 mph. Actual Speed: 39.5 mph.
Indicated speed: 45 mph. Actual Speed: 44.4 mph.
Indicated speed: 50 mph. Actual Speed: 49.4 mph.
Indicated speed: 55 mph. Actual Speed: 54.3 mph.
Indicated speed: 60 mph. Actual Speed: 59.2 mph.
Indicated speed: 65 mph. Actual Speed: 64.2 mph.
Indicated speed: 70 mph. Actual Speed: 69.1 mph.
Indicated speed: 75 mph. Actual Speed: 74.1 mph.
Indicated speed: 80 mph. Actual Speed: 79.0 mph.
Indicated speed: 85 mph. Actual Speed: 83.9 mph.
Indicated speed: 90 mph. Actual Speed: 88.9 mph.
Indicated speed: 95 mph. Actual Speed: 93.8 mph.
Indicated speed: 100 mph. Actual Speed: 98.8 mph.