Caster; Rigid; 8" x 2-1/2"; Foam Filled Flat Free; Plate (4"x4-1/2"; holes: 2-5/8"x3-5/8" slotted to 3x3); Prec BB; 275#; Premium Steel Hub (66536 is Swivel) (Trio Pines 6680RW-01-AFR-PBB)
Wheel Diameter: 8"Tread Width: 2-1/2"Material: Foam-Filled Flat Free Tire (Black)Load Rating (Per Item): 275 poundsFinish: ZincConnector Details: Plate (4"x4-1/2"; holes: 2-5/8"x3-5/8" slots to 3"x3"; 3/8" bolt)Bearing: Precision Ball BrngMisc Options: Sawtooth TreadLoad Height: 10"Swivel Radius: N/AShipping Weight: 6.75 lbs.Usually Ships in: 24 hours (may be affected by quantity ordered)
Flat Free (also known as semi-pneumatic) are extremely popular wheels. Made to perform like a pneumatic tire, they are filled with a lightweight, microcellular polyurethane foam. They retain the lightweight, bounce and cushion like a pneumatic tire, without the nuisance of air leaks.
Flat free wheels will typically experience temporary flat-spotting even when loaded within the acceptable weight limits. They tend to flat spot immediately, a little more after a few hours, a little more at 24 hours, and not much more after that regardless of time. Flat-spotting is more noticeable in warmer weather. The flat-spotting will roll-out and dissipate after a few minutes of rolling, depending on the size of the standing load and extent of the flat-spotting. This is a normal occurrence of these wheels and is not a product failure. If your application cannot tolerate this temporary condition, another material type may be preferable.