> For the complete documentation index, see [llms.txt](https://docs.revrobotics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.revrobotics.com/ion-build/motion/gearboxes/2-motor-drivetrain-gearbox-through-bore.md). # 2 Motor Drivetrain Gearbox - Through Bore ## Features * Adjustable speed based on pinion gears * Adjustable wheel size based on second stage gear pairs * Mountable in a variety of options to allow for chain-in-tube and chain/belt outside tube designs

2 Motor Drivetrain Gearbox - Through Bore

### Kit Contents | SKU | DESCRIPTION | QTY. | | --------------- | ----------------------------------------------------------------------------------------------------- | ---- | | REV-21-2190-P01 | 2 MOTOR DRIVETRAIN GEARBOX MOTOR PLATE | 1 | | REV-21-2190-P02 | 2 MOTOR DRIVETRAIN GEARBOX OUTPUT PLATE | 1 | | REV-21-2190-P03 | 2 MOTOR DRIVETRAIN GEARBOX 1/2IN HEX CLUSTER SHAFT | 1 | | REV-25-2489 | 2 MOTOR DRIVETRAIN GEARBOX SPACER PACK | 1 | | REV-25-2488 | 2 MOTOR DRIVETRAIN GEARBOX HARDWARE PACK | 1 | | REV-21-2079 | 1/2IN HEX THROUGH BORE SHAFT | 1 | | REV-21-2819 | [1/2 IN ROUNDED HEX SHAFT- 6.0IN LONG - TAPPED](https://www.revrobotics.com/.5in-Rounded-Hex-Shafts/) | 1 | | REV-21-1916-PK2 | FLANGED BEARING FOR 1/2IN ROUNDED HEX - 2 PACK | 1 | | REV-21-1937 | [20DP GEAR - 1/2IN HEX - 52T](https://www.revrobotics.com/20DP-Gears/) | 1 | | | BEARING, 30MM ID, 42MM OD, 7MM THICK, SHIELDED, FLANGED - 2 PACK | 1 |