function calculaterimsize ( section3, profile3, diameter3 ) {
         if(profile3<50) scalar=0.85; if(profile3>=50) scalar=0.7;
         rimwidth=(Math.round(((section3*scalar)*0.03937)*2))/2;
         rimwidthupper=(rimwidth+1.5);
         document.rimsizes.rimwidth.value=rimwidth;
         document.rimsizes.rimwidthupper.value=rimwidthupper;
         document.rimsizes.rimdiameter.value=diameter3;
         document.rimsizes.rimdiameterupper.value=diameter3;
      }