Which Tire Size Calculator is correct?

[Kelpie]

Hi all,

 

There is this scenario of upsizing a default stock tyre size from 195/60R15:

 

The info gathered http://www.1010tires.com/tiresizecalculator.asp is this:

 

For 195/60R15, the speed is 100Km/h

For 205/55R16, the speed is about 97.3Km/h (2.726% slower)

For 225/55R16, the speed is about 95.6Km/h (4.538% slower)

 

But when I compare with another site at: http://www.tacomaworld.com/forum/tirecalc.php , the result is different:

 

For 195/60R15, the speed is 104.61Km/h

For 205/55R16, the speed is about 107.48Km/h

For 225/55R16, the speed is about 109.35Km/h

 

So who is correct? or I did it wrongly?

 

Thank you.

 

 

Regards,

[Good-Carbuyer]

You may be aware that some makes come with deeper tread depth than others. Hence some difference among them.

[Fitvip]

Hi all,

 

There is this scenario of upsizing a default stock tyre size from 195/60R15:

 

The info gathered http://www.1010tires.com/tiresizecalculator.asp is this:

 

For 195/60R15, the speed is 100Km/h

For 205/55R16, the speed is about 97.3Km/h (2.726% slower)

Speedometer1: 58.4 mph 97.3 km/h

For 225/55R16, the speed is about 95.6Km/h (4.538% slower)

Speedometer1: 56.4 mph 94.0 km/h

 

But when I compare with another site at: http://www.tacomaworld.com/forum/tirecalc.php , the result is different:

 

For 195/60R15, the speed is 104.61Km/h

For 205/55R16, the speed is about 107.48Km/h

65 mph (104.61 km/h) 66.79 mph (107.48 km/h)

For 225/55R16, the speed is about 109.35Km/h

65 mph (104.61 km/h) 69.11 mph (111.22 km/h)

 

So who is correct? or I did it wrongly?

 

Thank you.

 

 

Regards,

 

I tried your 1st calculator and the result is different from yours!

 

I think the first calculator is based on stock tyre at 100 km/h and the resultant speedo reading are slower, which is correct.

 

The second calculator is based on the stock tyre at 60 mph/104.64 km/h, new tyre's actual speed should be ...assuming the same number of revolution!

Edited April 19, 2012 by Fitvip