It looks like this Part has been superseded by LEGO Part 74967 Wheel 8 x 9 with Hole Notched for Wheels Holder Pin, Re-inforced Back.
Click on a colored part below to see the Sets and MOCs that use part 30027a Wheel 8 x 9 with Round Hole for Wheel Holder Pin in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
This part has been used by MOCs in the following colors but not officially released.
There are 4 Mold variations of part 30027a - Wheel 8 x 9 with Round Hole for Wheel Holder Pin in the database, in use between 1996 to 2002. See Molds and other related Parts.