<script type="text/javascript"><!-- [et_pb_line_break_holder] -->/* <![CDATA[ */<!-- [et_pb_line_break_holder] -->/*<!-- [et_pb_line_break_holder] --> * @copyright (C) 2013 - http://www.tyresizecalculator.com, All rights reserved.<!-- [et_pb_line_break_holder] -->*/<!-- [et_pb_line_break_holder] -->(function($){<!-- [et_pb_line_break_holder] -->$(document).ready(function() {<!-- [et_pb_line_break_holder] --> $("#result_wrapper").hide();<!-- [et_pb_line_break_holder] --> $("#loading").hide(); <!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] --> resultTable = function(serverData) {<!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] --> $("#result *").remove();<!-- [et_pb_line_break_holder] --> $("#loading").hide(); <!-- [et_pb_line_break_holder] --><!-- [et_pb_line_break_holder] --> if(serverData.success==0) {<!-- [et_pb_line_break_holder] --> $("#result_wrapper").show();<!-- [et_pb_line_break_holder] --> var err = "<p><strong>Sorry, no tyres found that could fit. Try to change some of the input parameters. Thank You.</strong></p>";<!-- [et_pb_line_break_holder] --> $(err).appendTo("#result");<!-- [et_pb_line_break_holder] --> } else {<!-- [et_pb_line_break_holder] --> var table = "<table class=\"tsc-tbl\" id=\"tsc-result\"><tbody></tbody></table>";<!-- [et_pb_line_break_holder] --> $(table).appendTo("#result");<!-- [et_pb_line_break_holder] --> var header = "<tr><th>Optional<br />Size</th><th>Side<br />wall<br />(mm)</th><th>Diam<br />eter<br />(mm)</th><th>Diff<br />%</th></tr>";<!-- [et_pb_line_break_holder] --> $(header).appendTo("#result tbody");<!-- [et_pb_line_break_holder] --> var minimum = Math.abs(serverData.data[0].perc);<!-- [et_pb_line_break_holder] --> $.each(serverData.data, function(entryIndex, entry) {<!-- [et_pb_line_break_holder] --> var width = entry.width;<!-- [et_pb_line_break_holder] --> var ar = entry.ar;<!-- [et_pb_line_break_holder] --> var diam = entry.diam;<!-- [et_pb_line_break_holder] --> var nd = parseFloat(entry.nd).toFixed(2);<!-- [et_pb_line_break_holder] --> var perc = entry.perc;<!-- [et_pb_line_break_holder] --> if (Math.abs(perc)<minimum) minimum = Math.abs(perc);<!-- [et_pb_line_break_holder] --> var sidewall = width*ar/100;<!-- [et_pb_line_break_holder] --> var tblrow = '<tr><td class="optsizes">' + width + "/" + ar + "R" + diam + "</td><td>" + sidewall + "</td><td>" + nd + '</td><td class="difference">' + perc + "</td></tr>";<!-- [et_pb_line_break_holder] --> $(tblrow).appendTo("#result tbody");<!-- [et_pb_line_break_holder] --> }); // END $.each(serverData.data<!-- [et_pb_line_break_holder] --> $("#result_wrapper").show();<!-- [et_pb_line_break_holder] --> } // END if(response.success==0) {...<!-- [et_pb_line_break_holder] --> }; // END function resultTable(data) {...<!-- [et_pb_line_break_holder] --> $("#tsc-submit").click(function(e) {<!-- [et_pb_line_break_holder] --> e.preventDefault();<!-- [et_pb_line_break_holder] --> $("#loading").show();<!-- [et_pb_line_break_holder] --> var $arr = { width:$("#width option:selected").html(),<!-- [et_pb_line_break_holder] --> ar:$("#ar option:selected").html(),<!-- [et_pb_line_break_holder] --> wheel:$("#wheel option:selected").html(),<!-- [et_pb_line_break_holder] --> newwheel:$("#newwheel option:selected").html(),<!-- [et_pb_line_break_holder] --> task:'calculate'<!-- [et_pb_line_break_holder] --> };<!-- [et_pb_line_break_holder] --> var d = Math.round( ($arr["wheel"]*25.4 + 2*$arr["width"]*$arr["ar"]/100)) ;<!-- [et_pb_line_break_holder] --> var s = $arr["width"]*$arr["ar"]/100;<!-- [et_pb_line_break_holder] --> /* Small table - Original tyre size */<!-- [et_pb_line_break_holder] --> $("#tyreinfo > *").remove();<!-- [et_pb_line_break_holder] --> var tbl = "<table id=\"tsc-origsize\" class=\"tsc-tbl\"><tbody></tbody></table>";<!-- [et_pb_line_break_holder] --> $(tbl).appendTo("#tyreinfo");<!-- [et_pb_line_break_holder] --> var tbl_c = "<tr class=\"orig_size\"><th>Original Size</th><td>" + $arr["width"] + "/" + $arr["ar"] + "R" + $arr["wheel"] + "</td></tr><tr><th>Wheel<br />Diameter</th><td>" + $arr["wheel"] + "\"</td></tr><tr><th>Thread<br />Width<br />(mm)</th><td>" + $arr["width"] + "</td><tr><th>Sidewall<br />(mm)</th><td>" + s + "</td></tr><tr><th>Diameter<br />(mm)</th><td>" + d + "</td></tr>";<!-- [et_pb_line_break_holder] --> $(tbl_c).appendTo("#tyreinfo tbody");<!-- [et_pb_line_break_holder] --> $.ajax({<!-- [et_pb_line_break_holder] --> type: 'GET',<!-- [et_pb_line_break_holder] --> url: 'http://www.tyresizecalculator.com/index.php?option=com_tsc',<!-- [et_pb_line_break_holder] --> data: $arr,<!-- [et_pb_line_break_holder] --> dataType: 'jsonp',<!-- [et_pb_line_break_holder] --> jsonpCallback: "resultTable"<!-- [et_pb_line_break_holder] --> });<!-- [et_pb_line_break_holder] --> }); // END $("#subm").click(function(e) {...<!-- [et_pb_line_break_holder] -->}); // END $(document).ready(function()...<!-- [et_pb_line_break_holder] -->})(jQuery);<!-- [et_pb_line_break_holder] -->/* ]]> */<!-- [et_pb_line_break_holder] --></script>
Tyre Size Calculator helps you determine tyre size when you place larger wheels.
Enter the original tyre size and the new wheel size into the form below.
The calculator will make a list of optional tyre sizes for the new wheel.
Powered by Tyre Size Calculator
Note:
The optional tyres have a diameter in the range of -3% to +4% of the difference between the outer tyre diameter and the wheel diameter (D-W). This formula is used by leading tyre manufacturers
Tyre interchangeability is not always possible, so be sure to consult your car manufacturer’s manual before changing your tyres. This is for informative purposes only.
What is Plus Sizing?
Plus sizing or up-stepping is the practice of replacing the wheel with a larger one and mounting a lower profile tyre while maintaining the same (or approximately the same) diameter and circumference as the original tyre.