Description
Product Overview
The SHMTOOL Transmission Mainshaft Support is engineered from premium aluminum to deliver robust reinforcement for Big Twin 4‑speed transmissions dating from 1965 onward. Designed to fill the gap when an aluminum primary is not employed, this component maintains alignment and reduces stress on the mainshaft. It measures 8.1 x 0.6 x 2.9 inches and weighs just 1.13 pounds, making it lightweight yet exceptionally strong. The package includes one mainshaft support and a rubber‑shielded sealed bearing, ensuring immediate readiness for installation.
Usage
This support is ideal for riders and builders who install open belt drive units or custom tin primaries on their motorcycles. It fits Big Twin models with a 4‑speed transmission and is not compatible with rear belt‑drive configurations. Whether you are restoring a classic bike or assembling a high‑performance custom, the SHMTOOL support provides the necessary stability for smooth power delivery in both street and track environments.
Why Choose Us
SHMTOOL is renowned for precision engineering and durable automotive components. This mainshaft support undergoes rigorous quality testing to meet strict automotive standards, ensuring it can withstand the high torque loads typical of powersports applications. The inclusion of a sealed bearing reduces maintenance needs and protects against contaminants, delivering long‑term reliability that professional mechanics trust.
Key Features
- High‑grade aluminum construction for lightweight strength
- Provides essential support when an aluminum primary is absent
- Includes a rubber‑shielded sealed bearing for smooth operation
- Easy bolt‑on installation with standard transmission mounting points
- Designed specifically for Big Twin 4‑speed models from 1965 onward
FAQ
Will this support fit my motorcycle if it has a rear belt drive?
No, the SHMTOOL Mainshaft Support is not compatible with rear belt‑drive configurations. It is intended for chain‑drive or open belt‑drive setups where an aluminum primary is not used.
Do I need any additional tools to install the support?
Installation requires standard hand tools such as a socket set and torque wrench. No special equipment is needed, but following the torque specifications in the service manual is recommended.
Can this support be used on motorcycles other than Big Twin models?
The design is optimized for Big Twin 4‑speed transmissions. While it may physically fit some similar engines, we advise using it only on the specified models to ensure proper alignment and safety.
Is the sealed bearing included pre‑lubricated?
Yes, the rubber‑shielded sealed bearing comes pre‑lubricated and is protected against dust and moisture, providing immediate functionality upon installation.
What is the warranty on this product?
SHMTOOL offers a one‑year limited warranty covering manufacturing defects. Please retain your purchase receipt for warranty claims.
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