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Single Speed, Double Reduction Gearbox

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 lightweight package. The specific transmission layout and ratio selections allow for an extremely small form factor, without a lot of complexity!

  • 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

  • Designed to work with Grayhill 63R series encoder (coupler required)

  • Can be adapted for any encoder with a 1/4" male shaft

  • Assembly Required, see instructions below

  • Encoders and Motors not included

SKU: singlespeeddoublereduc

Availability: Varies

  • - In Stock
  • - Out Of Stock
  • - Backorder

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.



P/N Description Material CAD Drawings Weight
217-2454 Single Speed Double Reduction Standard Option Gears: 7075-T6 Aluminum
CIM Input Gears: 4140 Steel
Shafts: 7075-T6 Aluminum
Housing: Glass-Filled Nylon
STEP Gearbox
Output Shaft
1.260 lbs
(No Motors)
How To
Additional Info
Kit Contents

217-2454: Standard Option

  • (1) Single Speed, Double Reduction Housing Kit
  • (1) Gearbox Mounting Bracket
  • (1) 1/2" Hex Output Shaft
  • (2) 12t CIM Motor Gear (Steel) w/ 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
Outputs Output: 1/2" Hex
Specification Gears require lubrication. We recommend white lithium grease or DuPont Teflon Non-Stick Dry-Film Lubricant