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<p>[QUOTE=&quot;mtoo, post: 11961210, member: 57517&quot;]If memory serves me right.&nbsp; .87 (old RTO14613) x 3.42 x 516 (revolutions per mile for that tire) = 1535&nbsp; then 1550 RPM X 60 = 93000&nbsp; take 93000 divided by 1535 gives us&nbsp; 60.6 MPH at 1550&nbsp; If it&#039;s a newer RTLO transmission, then it&#039;s .73 ratio in top hole then it come out to 72MPH at 1550</p><p><br /></p><p>That&#039;s a lot of memory for an old guy, but I think I calculated right</p><p><br /></p><p>RPM x 60 (divided by) transmission gear ratio x rear end ratio x tire revolutions per mile = MPH</p><p><br /></p><p>Use this to figure out what any tire size changes or rear end changes will have on MPH[/QUOTE]</p><p><br /></p>

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