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Date:         Thu, 16 Apr 1998 00:38:29 -0700
Reply-To:     Denis Bélisle <debels@TOTAL.NET>
Sender:       Vanagon Mailing List <Vanagon@vanagon.com>
From:         Denis Bélisle <debels@TOTAL.NET>
Subject:      Re: Thanks for Speedometer help
Comments: To: Vanagon Mailing List <Vanagon@vanagon.com>
Content-Type: text/plain; charset=iso-8859-1


Hello,
is the formula for tire diameter   185 x % x 2divided by  25.4   +  14
let say 185.80.14                         |
|                           |           |
                                               widht
|                           |           |


ratio                       |           |
185 x 80% x 2
Convert mm    |
148 x 2 =296mm                                                    to
inches        |


|
296 / 25.4= 11.653
inches                                                      Wheel
diameter


11.653 + 14 inches =25.65 inches  Overall diameter






205 70 14


205x70% = 143.5


143.5 x 2 =287 mm


287 / 25.4 =11.299


11.299+ 14 inches = 25.299    Overall Diameter


On my westie i have 205 70 14
I didn't notice a lot a difference on the speedo betwen 185/ 80 to 205/
70
I think bentley shop manual say  in fourth gear you have 18 mile per
hour by
1,000 rpm     so at  4,000 rpm you should be around  70 or 72 mph
 I'm just betwen these two


 Denis Bélisle
Saint-Basile le grand
Québec Canada
85 westie
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