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.
Page 54
SIZ 2D6 7
or about 3 foot 9 inches.
Are the size connected to the caste/role of a dwarf? No.