Standard B Wheel (center), 16" dia. x 6", 10 lbs, All dollies with "B" at the end of the model number get these as standard.

Fat Wheel (far left), 19" dia. x 9.5", 15 lbs,

All wheels use 1" diameter wheel shafts
If you are buying replacement wheels or upgrading; Fats use different length shafts than Standard A or B's. The longer shafts are included with the purchase of Fats.

NOTE:
If the 1st digit in the model number is an 8 or 9 - the dolly comes with STANDARD B wheels. These dollies also have 4 wheels, when ordering larger wheels it is double the additional price.