TIRE DI­AM­E­TER

De­ter­min­ing how big your tire will be

4 Wheel & Off Road - - WHEEL & TIRE TECH 101 -

CAL­CU­LAT­ING OVER­ALL TIRE DI­AM­E­TER

To cal­cu­late the over­all tire di­am­e­ter you only need the size of the tire. The fol­low­ing for­mula will help you de­ter­mine the tire di­am­e­ter and give you a good idea as to whether or not that new rim and tire combo you want will fit. Just com­pare the over­all di­am­e­ter (of the de­sired tire) in inches to your stock tire and this will al­low you to mea­sure up your ve­hi­cle to see if it will fit with or with­out mod­i­fi­ca­tions. You must also take into con­sid­er­a­tion the width of the tire you are propos­ing to put on, just be­cause the od matches doesn’t mean the width won’t put a damper on your new­found fit­ment. Please note that all over­sized fit­ments should be left to a pro­fes­sional so they can tell you what, if any, mod­i­fi­ca­tions need to be per­formed. When up­siz­ing rims on a ve­hi­cle it is also im­por­tant to con­sider the fol­low­ing:

BE SURE THAT THERE IS NO CON­TACT WITH THE TIRE AND THE IN­NER FENDER LINER.

FIX: You can al­ways heat up the fender liner and re­mold it or in some in­stances you may have to re­move the fender liner. Please note that re­mov­ing the fender liner may cause ex­ces­sive road noise from de­bris bounc­ing off bare metal and that valu­able elec­tron­ics may now be ex­posed. In­spect care­fully!

BE SURE THERE IS NOT CON­TACT ON ANY CON­TROL ARMS, SPRING PERCH, OR ANY OTHER OBSTRUCTIONS THAT MAY BE THERE.

FIX: Many shops will trim metal brack­ets to avoid any mi­nor scrap­ing. This should be left to an ex­pert and be ad­vised that dam­age to the body or paint may oc­cur if not done prop­erly.

BE SURE THAT THE CASE NUT UN­DER THE SPRING PERCH DOES NOT TOUCH THE TOP OR IN­NER SIDE­WALL OF THE TIRE. AS THE TIRES HEAT UP THEY WILL EX­PAND, SO KEEP THAT IN MIND.

FIX: Run a slightly smaller tire. In some cases the nut is shaved down slightly to add ex­tra clear­ance. Please note that we do not rec­om­mend this but are just ed­u­cat­ing you on what is some­times done. If you choose to do this make sure that it is left to a pro­fes­sional, as shav­ing too much of this bolt may have detri­men­tal con­se­quences.

BE SURE THAT THE IN­NER LIPS ON YOUR FENDER DON’T CON­TACT ANY PART OF THE TIRE WHILE DRIV­ING STRAIGHT, DUR­ING COM­PRES­SION, OR HARD COR­NER­ING.

FIX: You can have the fend­ers ei­ther rolled or cut. If you do roll fend­ers be sure to have an ex­pert do it to pre­vent paint chip­ping of un­even (and ragged) fend­ers. When cut­ting fend­ers be sure to sand down the cut edges to en­sure that they are smooth. When done you should ap­ply a coat of rust-proof­ing or paint to seal the open area.

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