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The new Super Ultralast wheel possesses off-the-chart performance characteristics - specifically in the areas of thermal retention and rollability.
Heat buildup in polyurethane, due to high loads or continuous duty applications, is the most common cause for material breakdown over the life of a polyurethane-tread wheel. Super Ultralast 1" thick polyurethane operates much cooler under load and at higher speeds compared to other urethanes.
For example, the urethanes rebound test results, which can be a proxy for rollability, measures 110% higher than Duralast, 60% higher than PolySoft and 20% higher than Vulkollan. So the combination of Super Ultralasts very low thermal retention and extremely high rollability characteristics results in an ultra high performance wheel that
. This wheel includes a Tapered Roller Bearing with a caster hub length of 4-1/2".