TeraFlex 4838130 JK JKU HD Adjustable Spare Tire Mounting Kit Fits all JK Wrangler models including Rubicon and Unlimited If installed without the HD hinged carrier the maximum tire size recommended is 35". This adjustable carrier kit has been designed to be installed in conjunction with the teraflex HD hinged carrier, but can be installed separately A wheel spacer (#1055005) is available separately for wheels with more than 5" of backspacing.