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. Minor flat spotting may be noticeable 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.
Please note that storing these wheels in areas that are subject to wide temperature fluctuations can destroy the microcellular foam interior.