Back Filter the content Wheel diameter (mm) All 25 30 32 35 40 42 48 50 55 65 70 80 Load capacity (kg) All 20 25 30 40 44 55 60 70 90 100 110 140 150 200 220 270 310 Material wheel All Polyamide Polyurethane cast iron / steel Bearing All Ball bearing Hub bore (mm) All 6 8 10 12 15 17 20 25 Hub width (mm) All 6 7 8 9 10 12 14 15 24 1 - 5 from 5 Back Polyamide Conveyor rollers with ball bearing Polyurethane Conveyor rollers with ball bearing Polyurethane Conveyor rollers with ball bearing Polyurethane Conveyor rollers with light round profile, with ball bearing Steel rollers 1 - 5 from 5