VENTUS Z207 (Z207) VENTUS Z207 (Z207) Circuit/Wet For exclusive use on wet surfaces.Extremely reliable circuit tire for exclusive use on wet surfaces. Sizes & Specs Size Compound Rim Size Overall Diameter (mm) Section Width (mm) Tread Width (mm) Permitted Optimum 240/570R13 W5 10 11 574 290 250 190/580R15 W5 6.5 7.5 577 205 190 210/610R16 W5 7.5 8.5 610 223 210 200/620R17 W5 7 8 625 210 200 235/620R17 W5 8.5 9.5 618 247 234 240/640R18 W5 8.5 9.5 644 245 225 260/660R18 W5 9.5 10.5 660 282 254 270/680R18 W5 10.5 11.5 685 298 270 280/650R18 W5 10.5 11.5 656 297 280 280/660R18 W5 10.5 11.5 660 302 274 280/680R18 W5 10 11 682 302 285 300/660R18 W5 11.5 12.5 655 325 300 300/680R18 W5 11.5 12.5 677 330 300 320/710R18 W5 12.5 13.5 707 350 318