Wheel; 8" x 2-1/2"; Semi-Pneumatic (Black); Ball Brng; 1/2" Bore; 2-7/16" Hub Length; 450#; Centered One-piece Hub; Ribbed Tread
Wheel Diameter: 8"Tread Width: 2-1/2"Material: Solid Rubber on Plastic Hub (Black)Load Rating (Per Item): 450 poundsBearing: Ball BrngCentered One-piece HubMisc Options: Ribbed TreadHub Type: Centered One-piece HubBore: 1/2"Hub Length: 2-7/16"Shipping Weight: 4.25 lbs.Usually Ships in: 24 hours (may be affected by quantity ordered)
When selecting a wheel, make sure to get the weight capacity needed along with the diameter, width, and axle bore. In some cases, the hub length is critical to a good fit. As with casters, the larger the wheel, the easier the push will be. Pay attention to hard vs soft wheels, propensity to flatten and marking vs non-marking.
Remember that larger diameter equates to ease-of-roll while wider width equates to higher weigth capacity.
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.