LGB created the name although the gauge was used previously as I scale standard gauge and III scale narrow gauge. LGB models mostly European metric gauge (between American standard and narrow gauges) so should theoretically be called II scale.
Originally and correctly, G scale is the use of 45mm gauge track, as used in standard gauge I scale (NEM 010), aka 3/8" scale (NMRA S-1), for modelling metre gauge narrow gauge railways, using the correct scale of 1:22.5.
Comparable detailed trucks are available from Athearn in the Genesis line, and they include code 88 semi scale wheels, with "rolling" bearings. I chose the ExactRail product so that I could test them out.
 See also: Scale, G scale, Standard, Track, Gauge
  
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