Products / Services
Back-Cut Transmission Service
Race Proven Transmission Parts and Services Engineered to Perform for the Street and Strip
This is "THE" Back-Cut Everyone is talking about! Often Imitated but NEVER Duplicated! Smooth, consistent shifts, set up by Andy Simon, Sr himself for you and your specific application. Available in 3 different "cuts"... Pro-Street, Drag-Race, and Road Race. Tried, trued, and Proven in the World's Quickest & Fastest Harley-Davidsons. Developed and continuously improved for OVER 35 Years!
This is "THE" Back-Cut Everyone is talking about! Often Imitated but NEVER Duplicated! Smooth, consistent shifts, set up by Andy Simon, Sr himself for you and your specific application. Available in 3 different "cuts"... Pro-Street, Drag-Race, and Road Race. Tried, trued, and Proven in the World's Quickest & Fastest Harley-Davidsons. Developed and continuously improved for OVER 35 Years!
This is "THE" Back-Cut Everyone is talking about! Often Imitated but NEVER Duplicated! Smooth, consistent shifts, set up by Andy Simon, Sr himself for you and your specific application. Available in 3 different "cuts"... Pro-Street, Drag-Race, and Road Race. Tried, trued, and Proven in the World's Quickest & Fastest Harley-Davidsons. Developed and continuously improved for OVER 35 Years!
Simon's Complete Back-Cut Transmissions with Door & Drum
Race Proven Transmission Parts and Services Engineered to Perform for the Street and Strip
This is "THE" Back-Cut Transmission everyone is talking about! Often Imitated but NEVER Duplicated! Available for both Twin Cam and M8 models. Available Options include... Standard or N1 Neutral Down Shift Pattern on the Shift Drum and choice of the standard Mill Billet Aluminum finish or Textured Black Powder Coating available on the Trap Door.
This is "THE" Back-Cut Transmission everyone is talking about! Often Imitated but NEVER Duplicated! Available for both Twin Cam and M8 models. Available Options include... Standard or N1 Neutral Down Shift Pattern on the Shift Drum and choice of the standard Mill Billet Aluminum finish or Textured Black Powder Coating available on the Trap Door.
This is "THE" Back-Cut Transmission everyone is talking about! Often Imitated but NEVER Duplicated! Available for both Twin Cam and M8 models. Available Options include... Standard or N1 Neutral Down Shift Pattern on the Shift Drum and choice of the standard Mill Billet Aluminum finish or Textured Black Powder Coating available on the Trap Door.
Simon Motorsports "Pro Billet Trap Door"
Race Proven Transmission Parts and Services Engineered to Perform for the Street and Strip
THE Strongest Trap Door you can buy!!! Machined to incredibly HIGH Tolerances for TRUE Centerlines and Reliability for the Dependability you can Trust! Designed for Maximum Strength, Accuracy, and Durability to eliminate common OEM alignment and flex issues. 6061 Billet Aluminum Made Right Here in the USA. Beware of "Knock Off Imitations" out there. This is "THE" Trap Door you need!
THE Strongest Trap Door you can buy!!! Machined to incredibly HIGH Tolerances for TRUE Centerlines and Reliability for the Dependability you can Trust! Designed for Maximum Strength, Accuracy, and Durability to eliminate common OEM alignment and flex issues. 6061 Billet Aluminum Made Right Here in the USA. Beware of "Knock Off Imitations" out there. This is "THE" Trap Door you need!
Simon's GEN 2 Pro Billet Trap Door with Neutral Detent Cover ( 2024-UP M8)
THE Strongest Trap Door you can buy!!! Machined to incredibly HIGH Tolerances for TRUE Centerlines and Reliability for the Dependability you can Trust! Designed for Maximum Strength, Accuracy, and Durability to eliminate common OEM alignment and flex issues. 6061 Billet Aluminum Made Right Here in the USA. Beware of "Knock Off Imitations" out there. This is "THE" Trap Door you need!
Standard "Mill Billet Aluminum" Finish
THE Strongest Trap Door you can buy!!! Machined to incredibly HIGH Tolerances for TRUE Centerlines and Reliability for the Dependability you can Trust! Designed for Maximum Strength, Accuracy, and Durability to eliminate common OEM alignment and flex issues. 6061 Billet Aluminum Made Right Here in the USA. Beware of "Knock Off Imitations" out there. This is "THE" Trap Door you need!
Optional "Matte Black" Powder Coated Finish
THE Strongest Trap Door you can buy!!! Machined to incredibly HIGH Tolerances for TRUE Centerlines and Reliability for the Dependability you can Trust! Designed for Maximum Strength, Accuracy, and Durability to eliminate common OEM alignment and flex issues. 6061 Billet Aluminum Made Right Here in the USA. Beware of "Knock Off Imitations" out there. This is "THE" Trap Door you need!
Simon Motorsports "Pro Billet Shift Drum"
Race Proven Transmission Parts and Services Engineered to Perform for the Street and Strip
Simon's "Pro Shift Drum" (Twin-Cam N1 Neutral Down Shift Pattern)
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Simon's "Pro Shift Drum" (M8 Standard Shift Pattern)
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Simon's "Pro Shift Drum" (M8 N1 Neutral Down Shift Pattern)
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