This is our Standard Truck It has cupped seats, and useing larger 3/8 bearings in

a cupped seat casting gives smoother operation. Machined spindle.

Clean cut threads for easy install. Large metal sheave on solid ss pin.

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Standard truck tops have loose bearings.

This truck has a cupped race so bearings sit in and make more contact.

Some companies use smaller diameter bearings on a flat, rough unfinished surface,

 typically they seize up after a while as bearings grind into seat and plastic holder

makes contact with base and becomes a friction break shown here.