2 Motor Drivetrain Gearbox - Through Bore Bundle


The 2 Motor Drivetrain Gearbox - Through Bore Bundle contains the REV-21-2190 base kit, the 20DP Gears needed for a 6in wheel ratio, and 20DP NEO Pinions Gears (10T, 11T, 12T) for multiple speed options. Motors not included.

This gearbox is compatible with the REV ION System and can be mounted in a variety of options, including flush with tube or spaced away from the tube to enable both chain in tube and chain/belt outside tube designs. The user can adjust speed by switching pinion gears on the motor between 10T, 11T, 12T, or can adjust wheel size by switching 2nd stage gear pairs.

2 Pairs of 2in pitch #10-32 tapped holes are available on the output shaft for mounting the REV Through Bore Encoder, and mount holes for the gearbox are on the same horizontal plane as the output, set 4 inches apart. The output shaft is 1/2in Hex through bore, and output gears have a MAXSpline bore. 


  • Material: AL 6061 Plates with steel gears
  • Weights:
    • 4in Wheel Ratio: 1.72 lbs
    • 5in Wheel Ratio: 1.75 lbs
    • 6in Wheel Ratio: 1.61 lbs

Kit Contents

   2 Motor Drivetrain Gearbox Motor Plate   QTY 1 
   2 Motor Drivetrain Gearbox Output Plate   QTY 1 
   2 Motor Drivetrain Gearbox 1/2in Hex Cluster Shaft   QTY 1 
 REV-25-2489   2 Motor Drivetrain Gearbox Spacer Pack   QTY 1 
 REV-25-2488   2 Motor Drivetrain Gearbox Hardware Pack   QTY 1 
 REV-21-2079   1/2in Hex Through Bore Shaft   QTY 1 
 REV-21-2819   1/2in Rounded Hex Shaft - 6.0in Long - Tapped   QTY 1 
 REV-21-1916-PK2   Flanged Bearing for 1/2in Rounded Hex - 2 Pack   QTY 1 
 REV-21-1937   20DP Gear - 1/2in Hex - 52T   QTY 1 
   Bearing, 30mm ID, 42mm OD, 7mm Thick, Shielded, Flanged - 2 Pack  QTY 1 
 REV-21-1926  20DP Gear - 1/2in Hex - 30T (for 6in Wheel Gear Ratio)  QTY 1 
 REV-21-3028  20DP Gear - MAXSpline - 68T (for 6in Wheel Gear Ratio)  QTY 1 
 REV-21-1998-PK2  20DP NEO Pinion Gear - 10 Tooth - 2 Pack (for Speed Option - Slow)  QTY 1 
 REV-21-1999-PK2  20DP NEO Pinion Gear - 11 Tooth - 2 Pack (for Speed Option - Medium)  QTY 1 
 REV-21-2000-PK2  20DP NEO Pinion Gear - 12 Tooth - 2 Pack (for Speed Option - Fast)  QTY 1 

Additional Options for Wheel Gear Ratios *the following products are not included in the bundle

This bundle contains the gears needed for a 6in wheel gear ratio as well as the pinions for slow, medium, and fast speed options. If a 4in or 5in wheel gear ratio is needed, refer to the table below to help purchase the extra gears needed to obtain the correct ratio:

4in Wheel Gear Ratio (REV-25-2514):

 REV-21-1931  20DP Gear - 1/2in Hex - 40T   QTY 1 
 REV-21-3023  20DP Gear - MAXSpline - 58T   QTY 1 

5in Wheel Gear Ratio (REV-25-2515):

 REV-21-1928  20DP Gear - 1/2in Hex - 34T   QTY 1 
 REV-21-3026  20DP Gear - MAXSpline - 64T   QTY 1 


CAD & Drawings