Variants of a mold are catalogued separately, so each one has its own sets and minifigs. Check these too if something you expect is missing here.

• 50951 Tyre 14 x 6 Solid Smooth Sub-part of this part
• 5794 Technic Axle Pin without Friction Ridges Lengthwise with Squared Hole Sub-part of this part
• 6683 Wheel 11 x 8 with Center Groove, One Smooth Side Sub-part of this part