Configurations:
- 80-100T Gearbox - This configuration uses the Robits 80-100 tooth mounting plate making it easy to change gear ratios and iterate on your drive characteristics.

- Through Tube - This configuration uses the Robits Pass Through Gearbox allowing the wheel to be mounted directly to the output shaft. This leaves more space above the chassis for additional structure. The integrated nut pockets on this gearbox allow it to be mounted both vertically and horizontally.

- Over Tube - This configuration uses the Robits Pass Through Gearbox in the flipped configuration to move the gearboxes closer to the center of the robot. This leaves more space at the ends of the chassis for openings.

**NOTE: This expansion requires a Robits Core Kit (am-5000)**
Items Included:
Electronics:
- 2 - NeveRest Orbital Gearmotor - 19.2 (am-3637b)
Structure:
- 2 - Robits 80-100T Motor Mount (am-5017)
- 8 - Robits Pass Through Plate (am-5023)
- 2 - Robits 0.5×0.5×14.0 Tube (am-5001-1400)
Motion:
- 8 - 14 Tooth 0.375 in Hex Bore HTD Pulley Half (am-4960_half)
- 8 - Robits Motion Bushing for 0.375 in Hex (am-5021)
- 8 - 30 Tooth 20DP 0.375 in Hex Bore Plastic Gear (am-5020_30)
- 8 - 50 Tooth 20DP 0.375 in Hex Bore Plastic Gear (am-5020_50)
- 2 - 225-5m-09 Belt (45 Tooth) (am-3273)
- 2 - 300-5m-09 Belt (60 Tooth) (am-4902)
- 4 - Robits 0.375IN Hex Shaft 4 in Long (am-5003-0400)
- 2 - 6 mm D to 0.375 in Hex-Shaft Adapter (am-3444)
- 2 - 4" BB Mecanum 0.375 in Hex Bore Wheel, Left (am-4735L)
- 2 - 4" BB Mecanum 0.375 in Hex Bore Wheel, Right (am-4735R)
Hardware:
- 16 - Spacer, 0.375 OD x 0.194 ID x 1.00 Long Nylon (am-1696)
- 10 - Spacer, 0.430 ID x 0.500 OD x 0.250 Long Aluminum (am-1698)
- 15 - Spacer, 0.430 ID x 0.500 OD x 0.500 Long Aluminum (am-1699)
- 16 - Screw, SHCS, 10-32 x 0500 (am-1002)
- 16 - Screw, SHCS, 10-32 x 1500 (am-1014)
- 16 - Screw, SHCS, 10-32 x 1750 (am-1048)
- 16 - 10-32 Nylock Jam Nut (am-1063)
- 24 - #10 Steel Washer (am-1026)
- 10 - M3-0.5 x 8 mm Socket Head Cap Screw with Thread Patch (am-1500)
- 16 - M3-0.5 x 12 mm Socket Head Cap Screw with Thread Patch (am-1706)