Vex 3 25in traction wheels vex 276 3525 a pack of four vex 82mm 3 25in diameter wheels these wheels include a tyre designed for optimal grip on soft surfaces like the foam tiles used in the vex robotics competition removable wheel inserts allow for additional versatility use these wheels with either standard drive shafts or high strength shafts in either a driven or free spinning application vex 3 25 traction wheel pk4