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Video Compression Ratio 1
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          A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Formulary Tyre Calculation


Rim-diameter + twice the tyre-height = tyre-diameter





The dynamic wheel-radius cannot be determined from the tyre description, indeed, the radius/diameter can. The precision is limited, because in the case of, e.g., the tyre-width, we're dealing with a grid dimension. Regardless of whether the tyre is 209 mm or 201 mm wide, the tyre always has the description '205'.

Wheel
diameter
Tyre heightRim diameter
Top to bottomTyre
width
Ratio
height to width
Inch -> mm

dR

=

b

·

h/b

100

+

dF·25,4

dR: Tyre diameter in mm, cm, dm, m
b: Tyre width in mm, cm, dm, m
h/b: Ratio from height to width in percent
dF: Rim diameter in inch

160/60 ZR 17

b = 160 mm; h/b = 60; dF = 17 Zoll

205/65 R 15 86T

b = 205 mm; h/b = 65; dF = 15 Zoll

Check your calculation!     You need help?
Insert numbers only in three of the four fields!
1. Tyre width mm cm dm m
2. Ratio from height/width   percent
3. Rim diameter   inch
4. Tyre diameter mm cm dm m
Places behind comma: 2 3 4 5    



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Translator: Don Leslie - Email: lesdon@t-online.de

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