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Cattle Boards
Trucks, Tractors & Machinery
18.4-30 vs 16.9-34
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<blockquote data-quote="Rmc" data-source="post: 1807386" data-attributes="member: 39072"><p>Metric sizing changes quite a bit . For example all 18.4 -34 tells you is that at its widest point in the sidewall it 18.4 inches wide .and is on a 34 inch rim.nothing about how tall the sidewall is thus allowing for a wide variety in side wall dimensions.</p><p>Where a 460/85r34 . Gives you width . Aspect ratio(percentage of side wall height to width )wich is side wall height.as well as rim diameter.</p><p>So it is 460mm at its widest point. 85 aspect ratio( 460mmx .85 =391) so a side wall height of 391 mm </p><p>R =radial</p><p>34=rim width.</p><p>While there is some variation between manufacturer about where and how they measure. And percentage of variance that is acceptable. Metric sizes are far closer in size between different manufacturers than the old measurement. Wich is becoming more of a issue.</p><p>Since sidewall height is directly related to rolling circumference. Wich newer tractors have far tighter tolerances before damage occurs to the drive train.</p><p>While some ag tires aren't regulated. Any tire with a dot stamp is must meet federal regulations.</p></blockquote><p></p>
[QUOTE="Rmc, post: 1807386, member: 39072"] Metric sizing changes quite a bit . For example all 18.4 -34 tells you is that at its widest point in the sidewall it 18.4 inches wide .and is on a 34 inch rim.nothing about how tall the sidewall is thus allowing for a wide variety in side wall dimensions. Where a 460/85r34 . Gives you width . Aspect ratio(percentage of side wall height to width )wich is side wall height.as well as rim diameter. So it is 460mm at its widest point. 85 aspect ratio( 460mmx .85 =391) so a side wall height of 391 mm R =radial 34=rim width. While there is some variation between manufacturer about where and how they measure. And percentage of variance that is acceptable. Metric sizes are far closer in size between different manufacturers than the old measurement. Wich is becoming more of a issue. Since sidewall height is directly related to rolling circumference. Wich newer tractors have far tighter tolerances before damage occurs to the drive train. While some ag tires aren’t regulated. Any tire with a dot stamp is must meet federal regulations. [/QUOTE]
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18.4-30 vs 16.9-34
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