The Sendel T03 is a spoke wheel often referred to as a bullet wheel, due to the bullet shaped cut outs in the spokes.?These trailer wheels can be used with any type of trailer, including flatbed, utility, snowmobile, boat, travel, horse, and goose-neck.? Aluminum wheels provide superior resistance to rust, are lighter weight than steel, and are a solid piece of metal which provide a smoother ride. Lighter wheel weight provides fuel efficiency. Bolt Pattern=6 on 5.5″ Bolt Pattern: 6 on 5.5″ Center Hole Diameter: 4.25″ Load Capacity: 3200 lbs Wheel Offset: 0 mm PSI Rating: 95 psi Backspacing: 3.50″