Re: RE: [DML] Tires

[gmfm1@xxxxxxxxxxx]

Hi Jon,

Wouldn't it be the other way around? If the total diameter of the tire/wheel is smaller (6mm x 2=12mm total less diameter) the wheel will have make more revolutions to travel the same distance, therefore the speedometer would read faster than you are really going, ie. speedo reading 60mph, but actually going slightly slower in reality. If 2.1% is the correct differential, if you are doing 60 mph, the speedo should show just over 61mph. Most speedo's aren't 100% accurate in the first place, but only an approximation of the speed that you are going.
Just asking?
Thanks,
Gary Masie

----- Original Message -----
From: Jon Heese 
Date: Monday, October 29, 2012 4:24 pm
Subject: RE: [DML] Tires
To: dmcnews@xxxxxxxxxxxxxxx

> Remember that the sidewall height is measured as a percentage of 
> the tread width. So yes, a 195/60R14 is 10mm narrower than a 
> 185/60R14, but it also has a 6mm shorter sidewall.
> 
> 185/60R14 means:
> 185 mm tread width
> 60% of 185 mm = 111 mm sidewall height
> 14 inch rim diameter
> 
> Going from a 195/60R14 to a 185/60R14 will make your speedometer 
> read 2.1% slow-- when your speedo says 60, you'll actually be 
> going 61.2 mph.
> 
> http://www.miata.net/garage/tirecalc.html 
> 
> 
> Regards,
> Jon Heese



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