APM Transmission Bearing Support - Harley Big Twin 4-Speed Open Belt
About APM
APM builds motorcycle lifts, stands and shop equipment sized for the weight and wheelbase of touring V-twins.
The APM Transmission Bearing Support is a robust cast 356 T6 aluminum bracket featuring an automotive-sealed ball bearing. This critical component provides essential support for the transmission main shaft, particularly when running an open belt drive without an inner primary.
Why riders pick this
- Supports transmission main shaft in open belt drive setups
- Cast 356 T6 aluminum construction for strength
- Automotive-sealed ball bearing for reliability
- Essential for Harley Big Twin 4-speed models
- Handles full load of clutch basket components
When you ditch the inner primary for an open belt drive, your transmission main shaft loses a key point of support. This APM Transmission Bearing Support steps in to carry the full load of your clutch basket and associated components, preventing deflection and potential damage. It's purpose-built for riders running a chain-driven rear wheel with an open primary setup.
Heavy-Duty Support for Open Primary Systems
- Constructed from durable cast 356 T6 aluminum
- Features an automotive-grade sealed ball bearing for reliable operation
- Specifically designed to support the main shaft in open belt drive configurations
- Essential for maintaining driveline stability without an inner primary
Built for Performance and Durability
This bearing support is a must-have for any Harley Big Twin 4-speed owner converting to an open belt primary. It ensures your transmission's main shaft remains stable under load, which is crucial for both performance and the longevity of your drivetrain components. Don't compromise on support when building a custom or performance-oriented V-twin.
Specifications
- Brand: APM
- Manufacturer Part #: 1120-0002
- Material: 356 T6 aluminum
- Length: 9 in
- Width: 5 in
- Height: 5 in
- Weight: 1.45 lbs
Common questions
Will this work with a super nut?
No — this bracket is not compatible with super nuts. You must use the stock main shaft nut for proper installation.
Can I use this with a belt drive and an inner primary?
No — this support is designed only for open belt configurations where the inner primary has been removed.
Does this fit Sportster or recent Big Twins?
This part is for 1965-and-later Harley-Davidson Big Twin 4-speed models with rear chain drive and an open belt primary configuration. It does not fit Sportster models or newer Big Twin platforms.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | APM |
| TYPE | Drive |
| SKU | 827-07104 |
| WEIGHT | 1.45 lb |
