It looks like this Part has been superseded by LEGO Part 87414 Tyre Offset Tread Small with Band around Center of Tread.
Click on a colored part below to see the Sets and MOCs that use part 3641 Tyre Offset Tread Small 15 x 6 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 2 Mold variations of part 3641 - Tyre Offset Tread Small 15 x 6 in the database, in use between 1976 to 2009. See Molds and other related Parts.