... or without bearing(4) Type: Solid, pneumatic, PU foam, semi-pneumatic, hollow etc.(5) Material of tire: Our rubber wheel has high natural rubber ... -4, 3.00-8, 3.25/3.00-8, 3.50-6, 3.50-7, 3.50-8, 4.00-4, 4.00-6, 4.00-8, 4.80/4.00-8, 5.00-6, 6.50-8 rubber wheel 4.80/4.00-8 ...