More 26+ 315 75 17 Tires. Toyota 4runner trd offroad w/kdssicon stage 72.5 extended coilovers w/cdcv w/front shims2.5 rear shocks w/cdcvdifferential dropupper & lower link kitadjustable. Find the correct size tires for your vehicle: A wide variety of 315 75 17.5 options are available to you, such as certification, width, and type. Using the example numbers the tires aspect ratio would calculate as 215x.65=139.75 where 139.75 is the tires height in millimeters.