Skip to content

Measuring Wheel Backspacing

Wheel Backspacing

We get all sorts of questions here at the Speed Shop, and one of our most common questions involves fitting custom wheels and tires. To get the right look, you really need to study your car, and make some important measurements. It’s also important to know the particular measurements if you’re planning to do your wheel and tire shopping at a swap meet. Always carry a measuring tape with you, so you can get a quick measurement.


Wheel Backspacing

A straight edge and measuring tape (or two measuring tapes) can give you an idea of your fitment. Place one tape on the plane of the wheel mounting surface, and then measure to the inner fender. You always want to give yourself a couple of inches to compensate for the “bulge” of the tire sidewall. If you’re running a narrow wheel and a wide tire, the bulge will be more significant. For this application, it looks like we can run about 5 inches of backspacing on our wheel.

Wheel Backspacing

To measure for the front spacing of the wheel, just reverse the process. Drop the tape or straight edge from the outer most point of the wheel opening and then measure from there to the mounting surface. Looks like we can get away with about 2.5 to 3 inches of front spacing on this application. That means we could easily fit an 8-inch wide wheel under the rear of this car, and then match it with a 235/75R15 tire or something similar.

Wheel Backspacing

When it comes time to do some swap meet scrounging, keep your measuring tape handy. You can usually eye ball it, but it helps to have two tapes or a straight edge. Lay the straight edge across the wheel, and then measure from the mounting surface to the straight edge. This one is showing 4.25 inches of backspacing, which will be perfect for our application.

2 Comments

  1. David on July 27, 2013 at 10:25 pm

    Thank you for the great article on how to measure backspacing!!!

  2. Fred T. Lee on November 17, 2015 at 5:21 pm

    Thanks Guys!!

Leave a Comment





Scroll To Top
[gravityform id=2 title=false description=false ajax=true tabindex=49]
<div class='gf_browser_unknown gform_wrapper' id='gform_wrapper_2' ><div id='gf_2' class='gform_anchor' tabindex='-1'></div><form method='post' enctype='multipart/form-data' target='gform_ajax_frame_2' id='gform_2' action='/measuring-wheel-backspacing/#gf_2'> <div class='gform_body'><ul id='gform_fields_2' class='gform_fields top_label form_sublabel_below description_below'><li id='field_2_1' class='gfield field_sublabel_hidden_label field_description_below gfield_visibility_visible' ><label class='gfield_label gfield_label_before_complex' >Name</label><div class='ginput_complex ginput_container no_prefix has_first_name no_middle_name no_last_name no_suffix gf_name_has_1 ginput_container_name' id='input_2_1'> <span id='input_2_1_3_container' class='name_first' > <input type='text' name='input_1.3' id='input_2_1_3' value='' aria-label='First name' tabindex='50' aria-invalid="false" /> <label for='input_2_1_3' class='hidden_sub_label screen-reader-text'>First</label> </span> </div></li><li id='field_2_2' class='gfield field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_2_2' >Email</label><div class='ginput_container ginput_container_email'> <input name='input_2' id='input_2_2' type='text' value='' class='medium' tabindex='54' aria-invalid="false" /> </div></li><li id='field_2_3' class='gfield field_sublabel_below field_description_below gfield_visibility_visible' ><label class='gfield_label' for='input_2_3' >Your Question</label><div class='ginput_container ginput_container_textarea'><textarea name='input_3' id='input_2_3' class='textarea medium' tabindex='55' aria-invalid="false" rows='10' cols='50'></textarea></div></li> </ul></div> <div class='gform_footer top_label'> <input type='submit' id='gform_submit_button_2' class='gform_button button' value='Submit' tabindex='56' onclick='if(window["gf_submitting_2"]){return false;} window["gf_submitting_2"]=true; ' onkeypress='if( event.keyCode == 13 ){ if(window["gf_submitting_2"]){return false;} window["gf_submitting_2"]=true; jQuery("#gform_2").trigger("submit",[true]); }' /> <input type='hidden' name='gform_ajax' value='form_id=2&amp;title=&amp;description=&amp;tabindex=49' /> <input type='hidden' class='gform_hidden' name='is_submit_2' value='1' /> <input type='hidden' class='gform_hidden' name='gform_submit' value='2' /> <input type='hidden' class='gform_hidden' name='gform_unique_id' value='' /> <input type='hidden' class='gform_hidden' name='state_2' value='WyJbXSIsIjA3ZTJiOTc1OGM3OTYyY2RlYmQ0MWI1YTA5NTQxMWRjIl0=' /> <input type='hidden' class='gform_hidden' name='gform_target_page_number_2' id='gform_target_page_number_2' value='0' /> <input type='hidden' class='gform_hidden' name='gform_source_page_number_2' id='gform_source_page_number_2' value='1' /> <input type='hidden' name='gform_field_values' value='' /> </div> </form> </div> <iframe style='display:none;width:0px;height:0px;' src='about:blank' name='gform_ajax_frame_2' id='gform_ajax_frame_2' title='This iframe contains the logic required to handle Ajax powered Gravity Forms.'></iframe> <script type='text/javascript'>jQuery(document).ready(function($){gformInitSpinner( 2, 'https://www.honestcharley.com/wp-content/plugins/gravityforms/images/spinner.gif' );jQuery('#gform_ajax_frame_2').on('load',function(){var contents = jQuery(this).contents().find('*').html();var is_postback = contents.indexOf('GF_AJAX_POSTBACK') >= 0;if(!is_postback){return;}var form_content = jQuery(this).contents().find('#gform_wrapper_2');var is_confirmation = jQuery(this).contents().find('#gform_confirmation_wrapper_2').length > 0;var is_redirect = contents.indexOf('gformRedirect(){') >= 0;var is_form = form_content.length > 0 && ! is_redirect && ! is_confirmation;var mt = parseInt(jQuery('html').css('margin-top'), 10) + parseInt(jQuery('body').css('margin-top'), 10) + 100;if(is_form){jQuery('#gform_wrapper_2').html(form_content.html());if(form_content.hasClass('gform_validation_error')){jQuery('#gform_wrapper_2').addClass('gform_validation_error');} else {jQuery('#gform_wrapper_2').removeClass('gform_validation_error');}setTimeout( function() { /* delay the scroll by 50 milliseconds to fix a bug in chrome */ jQuery(document).scrollTop(jQuery('#gform_wrapper_2').offset().top - mt); }, 50 );if(window['gformInitDatepicker']) {gformInitDatepicker();}if(window['gformInitPriceFields']) {gformInitPriceFields();}var current_page = jQuery('#gform_source_page_number_2').val();gformInitSpinner( 2, 'https://www.honestcharley.com/wp-content/plugins/gravityforms/images/spinner.gif' );jQuery(document).trigger('gform_page_loaded', [2, current_page]);window['gf_submitting_2'] = false;}else if(!is_redirect){var confirmation_content = jQuery(this).contents().find('.GF_AJAX_POSTBACK').html();if(!confirmation_content){confirmation_content = contents;}setTimeout(function(){jQuery('#gform_wrapper_2').replaceWith(confirmation_content);jQuery(document).scrollTop(jQuery('#gf_2').offset().top - mt);jQuery(document).trigger('gform_confirmation_loaded', [2]);window['gf_submitting_2'] = false;}, 50);}else{jQuery('#gform_2').append(contents);if(window['gformRedirect']) {gformRedirect();}}jQuery(document).trigger('gform_post_render', [2, current_page]);} );} );</script><script type='text/javascript'> jQuery(document).bind('gform_post_render', function(event, formId, currentPage){if(formId == 2) {} } );jQuery(document).bind('gform_post_conditional_logic', function(event, formId, fields, isInit){} );</script><script type='text/javascript'> jQuery(document).ready(function(){jQuery(document).trigger('gform_post_render', [2, 1]) } ); </script>