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Old 24th August 2006, 10:25   #1
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Tyre sizes and what they mean.
185 65 H R 13
185 :-
This is the width in mm of the tyre from sidewall to sidewall when it's unstressed and you're looking at it head on (or top-down). This is known as the section width.
65 :-
This is the ratio of the height of the tyre sidewall, (section height), expressed as a percentage of the width. It is known as the aspect ratio. In this case, 65% of 185mm is 120.25mm - the section height.
H :-
This is the speed rating of the tyre.
R :-
This tells you that the tyre is a radial construction.
13 :-
This is the diameter in inches of the rim of the wheel that the tyre has been designed to fit on.

185 65 R 13 91 V
185 :- Section width
65 :- Aspect ratio
R :- Radial
13 :- Rim diameter
91 :- load rating
V :-speed rating.
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Old 24th August 2006, 11:06   #2
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Dhananjay, welcome to Team-BHP

Please use the search function before posting, there are enough topics describing the tyres sizes & what they mean already.
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