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3 CIM Ball Shifter (shown with 3 optional CIM motors)

 3 CIM Ball Shifter (shown with 3 optional CIM motors)
  • 217-4247 (3 CIM Ball Shifter WCD 3rd Stage Kit)
  • 217-4247 (3 CIM Ball Shifter WCD 3rd Stage Kit)
  • 217-4248 (3 CIM Ball Shifter 3rd Stage Kit)
  • 217-4248 (3 CIM Ball Shifter 3rd Stage Kit)

3 CIM Ball Shifter

The ultimate FRC drivetrain gearbox. Ball-lock shifter enables seamless “on-the-fly” shifting at full speed in a compact, light & durable package.

  • Uses a long or short v2 shifter shaft
  • Use with one, two, or three CIM-style motors
  • Configurable Reduction & Shifter Spread Options
  • Designed specifically for the FIRST Robotics Competition, Battle Tested by Champions

The 3 CIM Ball Shifter ships disassembled. Please grease before assembly.

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General Information

VEXpro Ball Shifters provide a battle-proven 2-speed gearbox for easy integration into any FIRST ® Robotics Competition robot drivetrain. The 3 CIM Ball Shifter is the ultimate solution for a two-speed transmission in a competition robot. By utilizing a ball-lock style shifter, this gearbox is capable of “on-the-fly” shifting even when at full throttle. The VEXpro 3 CIM Ball Shifter includes mounting for one, two, or three CIM-style motors.

The Ball Shifter’s lightweight plastic housing includes several features for face mounting as well as hex-nuts embedded in its sides which allow for edge mounting. The housing includes internal features which will keep motor screws from dropping inside the gearbox while they’re being installed.

Every aspect of this transmission was designed with size in mind; this puts a 2-speed transmission into a tiny, lightweight form factor. The ball lock shifting method reduces the gap between the two gear reductions and allows for an extremely narrow assembly. The gear reductions were specifically chosen to reduce the overall transmission size and complexity while remaining highly efficient due to the AGMA 11 quality gears with teflon infused ceramic coating.

Multiple gearing options allow users to change the shifting spread between high & low gears to one of three options: 2.16x, 2.65x, and 3.68x.

The 3 CIM Ball Shifter comes standard as a 2-stage gearbox, but includes options for designers to include a 3rd gear stage for larger reductions; in this setup designers can also customize the overall gearbox ratio by choosing between four different 3rd stage gearsets (64:20, 60:24, 54:30, 50:34).

The 3rd stage output plate is shaped to allow for configurations in which wheels are directly mounted on the gearbox output shaft. This makes this gearbox well suited for West Coast-style drivetrains.


  • Designed for up to three CIM-style motors or gearboxes
  • Ball-lock shifter method enables smooth shifting, even at full speed
  • Housing is completely enclosed - keeps metal chips out, grease in
  • Face mount using standard mounting holes
  • Side mount using the embedded hex nuts for easier integration into your design
  • Assembly Required, see instructions below
  • Initial Stage: 50:12
  • High Gear Stage: 34:50

  • Low Gear Stage Option 1 (2.16x Shifter Spread): 50:34
  • Low Gear Stage Option 1 (2.65x Shifter Spread): 54:30
  • Low Gear Stage Option 1 (3.68x Shifter Spread): 60:24

  • 3rd Stage Option 1: 64:20
  • 3rd Stage Option 2: 60:24
  • 3rd Stage Option 3: 54:30
  • 3rd Stage Option 4: 50:34


The VEXpro 3 CIM Ball Shifter provides three different shifter spread options to teams. These options were chosen specifically to serve the needs of FIRST ® Robotics Competition designers. When designing an FIRST ® Robotics Competition drivetrain, teams typically try to ensure that the robot low-gear can survive a continuous pushing match (with high traction wheels) without tripping breakers. They then choose a high-gear which is "fast" enough to zip around the field, without being uncontrollable or accelerating too slowly.

The three options provided allow teams to find a balance which makes their high gear as fast as they want it, and gives their low gear as much torque they need.

Technical Specifications

Long Shifter Shaft 2.16 Ratio Spread Kit
Long Shifter Shaft 2.65 Ratio Spread Kit
Long Shifter Shaft 3.68 Ratio Spread Kit
Short Shifter Shaft 2.16 Ratio Spread Kit
Short Shifter Shaft 2.65 Ratio Spread Kit
Short Shifter Shaft 3.68 Ratio Spread Kit
Material Type:
  • Gears - 7075 T6 Aluminum with Teflon infused ceramic coating
  • CIM Input Gear - 4140 Steel
  • Shafts - 7075 T6 Aluminum
  • Shifter Housing - Glass-filled Nylon

Outputs: 1/2" Hex

Weights:
    Base Kits:
  • 217-3195 - (3 CIM Ball Shifter Gearbox): 2.21 lb
  • 217-3268 - (3 CIM Ball Shifter + 3rd Stage): 2.66 lb
  • 217-3269 - (3 CIM Ball Shifter + WCD 3rd Stage): 2.75 lb
  • 217-3267 - (3 CIM Ball Shifter Hardware Kit): 0.23 lb
  • 217-3250 - (3 CIM Ball Shifter Housing Kit): 0.59 lb

  • Pneumatics:
  • 217-2778 - (Pancake Cylinder, 3/4" Bore, 1/2" Travel): 0.138 lb

  • Spread Kits:
  • 217-3270 - (Short Shifter Shaft 2.16 Ratio Spread Kit): 0.559 lb
  • 217-3278 - (Short Shifter Shaft 2.65 Ratio Spread Kit): 0.574 lb
  • 217-3279 - (Short Shifter Shaft 3.68 Ratio Spread Kit): 0.607 lb
  • 217-3280 - (Long Shifter Shaft 2.16 Ratio Spread Kit): 0.579 lb
  • 217-3281 - (Long Shifter Shaft 2.65 Ratio Spread Kit): 0.590 lb
  • 217-3282 - (Long Shifter Shaft 3.68 Ratio Spread Kit): 0.623 lb
    3rd Stage Gear Kits:
  • 217-3286 - (3rd Stage 50:34 Gear Kit): 0.268 lb
  • 217-3285 - (3rd Stage 54:30 Gear Kit): 0.279 lb
  • 217-3284 - (3rd Stage 60:24 Gear Kit): 0.308 lb
  • 217-2617 - (3rd Stage 64:20 Gear Kit): 0.331 lb

  • Optional Sprockets:
  • 217-2662 (#35 Sprocket w/ Hub - 12t - 1/2" Hex ID): 0.04 lb
  • 217-2660 (#35 Sprocket w/ Hub - 15t - 1/2" Hex ID): 0.057 lb
  • 217-2642 (#25 Sprocket w/ Hub - 16t - 1/2" Hex ID): 0.03 lb
  • 217-3488 (#25 Sprocket w/ Hub - 18t - 1/2" Hex ID): 0.04 lb
  • 217-2640 (#25 Sprocket w/ Hub - 22t - 1/2" Hex ID): 0.045 lb