Home > VEXpro > Gears & Gearboxes > Single Speed, Double Reduction Gearboxes

The same old two stage gearboxes teams have come to know and love. This is the latest and greatest update to the basic layout John V-Neun & Paul Copioli created for the original "Kit Transmission" included in the FRC kit of parts in 2005. After years of iteration, this gearbox has several subtle features which add to its superior performance.

Plastic Housings, Aluminum Shafts and Aluminum Gears provide for a light weight package. The specific transmission layout and ratio selections allow for an extremely small form factor, without a lot of complexity!

  • Weight: 1.26 lbs
  • Designed for use with 2 CIM Motors
  • Use the Optional Replacement Second Stage Gears to change ratios
  • AGMA 11 quality gears with teflon infused ceramic coating
  • Housing is completely enclosed - keeps metal chips out, grease in
  • Compatible with US Digital Encoder (all hardware included)
  • Compatible with Grayhill Encoder (coupler required)
  • Assembly Required, see instructions below
  • Encoders and Motors not included
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Optional Second Stage Gearset 30/24

Our Price: $14.98
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Optional Second Stage Gearset 34/20

Our Price: $15.98
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Single Speed Double Reduction Standard Option (40/12 - 40/14)

The same old two stage gearboxes teams have come to know and love. This is the latest and greatest update to the basic layout John V-Neun & Paul Copioli created for the original "Kit Transmission" included in the FRC kit of parts in 2005. After years of iteration, this gearbox has several subtle features which add to its superior performance.

Plastic Housings, Aluminum Shafts and Aluminum Gears provide for a light weight package. The specific transmission layout and ratio selections allow for an extremely small form factor, without a lot of complexity!

  • Weight: 1.26 lbs
  • Designed for use with 2 CIM Motors
  • Use the Optional Replacement Second Stage Gears to change ratios
  • AGMA 11 quality gears with teflon infused ceramic coating
  • Housing is completely enclosed - keeps metal chips out, grease in
  • Compatible with US Digital Encoder (all hardware included)
  • Compatible with Grayhill Encoder (coupler required)
  • Assembly Required, see instructions below
  • Encoders and Motors not included

Our Price: $59.99
In Stock
Qty Add
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Single Speed, Double Reduction Gearbox Ratios

These gear ratio options were specifically chosen to give designers variability within a few key speed ranges; helping them get their gearing exactly where they want it to be:

Initial Stage: 40:12
Second Stage: 40:14
Overall Reduction: 9.52:1

Optional Second Stage #1: 34:20
Overall Reduction with Optional Stage: 5.67:1

Optional Second Stage #2: 30:24
Overall Reduction with Optional Stage: 4.17:1

Technical Specifications

Kit Contents
    Standard Option:
  • (1) Single Speed, Double Reduction Housing Kit
  • (1) Gearbox Mounting Bracket
  • (1) 1/2" Hex Output Shaft
  • (2) 12t CIM Motor Gear with Mounting Hardware
  • (1) 40t Gear with 3/8" Hex
  • (1) 14t Gear with 3/8" Hex
  • (1) 40t Gear with 1/2" Hex
  • (1) 1/2" ID flanged double shielded ball bearing
  • (2) 3/8" ID flanged double shielded ball bearing
  • (1) 1/2" Hex flanged double shielded ball bearing
  • (1) Grayhill Encoder Mount (coupler not included)
  • (1) Cluster Shaft
  • (4) Screw, #08-32 x 0.375" Socket head cap clear zinc
  • (2) Screw, #08-32 x 1.250" Socket head cap clear zinc
  • (2) Nut, #08-32 Nylock
  • (4) Screw, 1/4-20 x 1.375" Socket head cap clear zinc
  • (4) Nut, 1/4-20 Nylock
  • (2) 1.5" long standoff
  • (2) E-50 Retaining Ring

  • Optional Second Stage Gearset 34/20:
  • (1) 20t Gear w/ 3/8" Hex
  • (1) 34t Gear w/ 1/2" Hex

  • Optional Second Stage Gearset 30/24:
  • (1) 24t Gear w/ 3/8" Hex
  • (1) 30t Gear w/ 1/2" Hex
Downloads & Docs Assembly Instructions (PDF)
Recommended Grayhill Encoder Spec Sheet (not included)
US Digital Encoder Information (not included)
Outputs Output: 1/2" Hex
Specification VEXpro Gears Require Lubrication. We recommend white lithium grease.
Material Type Housing: Glass-filled Nylon
Gears: 7075 T6 Aluminum
Shafts: 7075 T6 Aluminum
Material Finish Gears: Teflon infused ceramic coating
CAD Model STEP File
Drawing Assembly Specs (PDF)
Weight Weight: 1.26 lbs