JIMS Fat 6-Speed Transmission Cassette: The Ultimate Drop-In Upgrade

Описание: Are you looking for the ultimate drivetrain upgrade for your Twin Cam or Milwaukee-Eight? In this video, we take a close look at the JIMS Fat 6-Speed Transmission Cassette—a masterpiece of American engineering that combines race-proven strength with the smoothness you need for long-haul touring.

Why upgrade to the JIMS Fat 6? Stock transmissions can struggle to handle the torque of high-performance engines, but building a stronger bike usually means dealing with noisy gears. JIMS has solved this with the Fat 6 by developing a transmission that uses straight-cut gears for massive strength (strong enough for drag racing and land speed records) while remaining quiet and refined for street riding.

Research & Development: Creating JIMS Fat 6 wasn’t about reinventing the wheel—it was about perfecting the connection between your engine and the road. They invested five years into designing, manufacturing and robustly testing each component, continually refining every aspect individually and then as a complete unit. They refused to release it until it was the highest-quality Transmission Cassette in the market. After five years of extensive research & development, JIMS has delivered a transmission cassette that balances race-ready strength with touring refinement.

Key Features & Benefits:

True Overdrive: Features a 0.86:1 sixth gear to lower your RPMs on the highway for a more relaxed cruise.

Incredible Strength: "Fat" straight-cut gears made from U.S. steel are designed to handle high-horsepower builds without failure.

Smooth Shifting: Precision machining and advanced shift dog ramps ensure finding neutral is easy and shifting is buttery smooth.

Drop-In Installation: This is a "Cassette" style kit—it slides right into your existing transmission case with no machining required.

100% Made in the USA: Designed, Tested, and Manufactured by JIMS in California.

Whether you're chasing land speed records like Hiro Koiso or just want the most reliable build for your daily ride, the Fat 6 is the authority in aftermarket transmission cassettes.

Need advice on fitment and other modifications for your specific bike? Drop a comment below or contact us directly at Rollies Speed Shop. We are Australia’s leading Distributor for Twin Cam & Milwaukee-Eight Aftermarket Performance Parts.