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Old May 10th, 2016, 11:09 PM   #48
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Join Date: Apr 2008
Location: Chicago, Near the Lake
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Mort, exactly correct → the softer the urethane the deeper it squishes, but if the layer over the hub is too thin, there isn't enough material to allow for the necessary amount of squishing, then rebounding back outward with max energy return.

Instead there is partial squish to the stress limit where rebound efficiency gets compromised, at which point the further squish wastes energy and degrades the urethane's rebound response..

Maybe if you weigh 110 lbs. Heliums could work well for you and last a decent amount of miles, but for more typical weight skaters, they need at least a few more millimeters of material added to get them close to a 70mm OD, instead of 64mm.

Rollin' on AIR
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