RE: Tire Sizes - Help for the math impaired

[dsedon@domain.elided]

russ, yure right - i guess this came before ya saw my last post on the subject...  ;~)  

but, since 215-50-15 is theoretically closer to the 195-55-15 that was stock on my werde, i'm gonna replace the present 205-50-15's on 'em w/the bigger size when they need it.  my 15x7 wheels can handle 'em.  any excuse for another 20 cm of rubber on the road at each end of the car, & 10 cm of total track width increase...  i wonder if i'll miss the shorter gearing of the 205's...  ;~)

regards,

doug s.

AlfaNeely@domain.elided wrote:

>Doug, Alex and all,
>       I agree with Doug's calculations as far as they go.  The problem is, 
>the manufacturers have not figured out that that is how they are supposed to 
>build the tires.  Not all 185 70 14 tires are created equal.
>       I once measured a bunch of tires just to see how they compared.  For 
>ease of measurement, I measured the circumference with a cloth tape.  They 
>were not all the same, even if marked the same size.
>       For all intents and purposes, the 165 14 (165 80 14), the 185 70 14, 
>the 195 65 14, the 205 60 14, the 195 60 15 and the 225 50 15 are ALL close 
>enough to the same diameter to work on our Alfas.  The variation in diameter 
>is probably less than the error in the speedometer anyway.
>       You do time Interstate mileage markers to re-calibrate the brain to 
>speedometer interface every time you buy new tires don't you?  I do.
>
>Ciao,
>Russ Neely
>Oklahoma City
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