Always keep in mind that Gloranthan dwarves are most emphatically not the Scottish-accented dwarves of the Peter Jackson movies or of most D&D campaigns. A small Gloranthan dwarf might only weigh 10 kg (22 pounds) and be 60 cm (23 inches) tall. That’s about the same size as my cat (admittedly she is a Maine Coon)! Dwarfs often have grotesque (but not hideous or repulsive) facial features, disproportionate and gnarled limbs, hunchbacked and twisted.
Larger dwarves exist, of course. A large dwarf might be 140 cm tall (55 inches) and weigh 75 kg (165 pounds). So there is a bewildering variety in sizes and shapes among dwarfdom. A dwarf like Ginkizzie or The Dwarf might be almost human sized, while other dwarfs in the community are no bigger than a large house cat.
Is there an average/mean size for gloranthan dwarves ?
SIZ 2D6, average 7
RQ Bestiary, Mostali, page 57
Dwarfs are stocky humanoids from 60–140 centimeters tall and from 10–75 kilograms in weight. Average size is 45 kilograms in weight and 115 centimeters tall.
SIZ 2D6 7
or about 3 foot 9 inches.
Are the size connected to the caste/role of a dwarf? No.