Re: [Chrysler300] 57C speedometer

[Philippe Courant <accf-club@xxxx>]

Hi,
You must note that the 235x75-14 (assuming it's the radial WWW Coker 
tire) is smaller in diameter than original bias 9.00-14:
235-75 x 14: 27.87" diameter
9.00-14: 29" diameter for US Royal, perhaps more for other brand

So ther's at least 5 % less diameter so 5 % faster speed than with 
original tires
I've checked on my '57 Imperial (i've the original speedo + an 
electronic speedo calibrated to my 225-14 radial tires) and ther's a 7 %
error . I checked with the two odometers on a 50 miles trip: original 
odometer : 54 miles. calibrated odometer: 50 miles
So before removing pinions, check on an accurate distance if the 
odometer is accurate.
To verify the speedo itself: 1000 rpm of speedo cable = 60 mph on speedo

--

Philippe COURANT (Pau, France)- Webmaster des sites ACCF et C-I-F
Imperial 57 Crown convertible
Buick 58 Roadmaster sedan HT

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