If you mean a BBS02 motor, you'll have only one chainring up front, ergo a 1 X 7 system. You may be able to fit a Microshift cassette, derailleur and shifter and have 11 X 46 gearing (AIR); about $75 for these components at Universal Cycle. This will increase your gearing range with one of the various 30 - 52 or so front chainrings available for the BBS02.