A new patent comes from static random access memory A sign that the U.S. parts maker is planning to enter turbine trainer Features a unique double-stranded design that allows indoor bike Simpler.
The patent, released Thursday, covers an indoor trainer with a “closed-loop component.”
The design appears to be achieved by mounting the bike directly to the stand and decoupling the chain from the cassette. The chain is then placed on a separate gear, which itself is connected to another gear, which drives another chain connected to the resistance wheel.
The bike is connected to the trainer via “axle supports”, which means the only element that needs to move is the chain. Neither the rear wheel nor the flywheel are engaged, so movement is not initiated.
(Image source: USPTO/SRAM)
How revolutionary is this coach?
SRAM’s entry into the smart trainer market seemed like a natural progression given SRAM’s expertise in power meters, kit and wireless communications (the basic elements of any quality trainer).
The design shown here appears to use a single sprocket, eliminating traditional gearing. This approach reflects Wahoo Kickr Core Zwift One Trainerwhich simulates gear changes through digital resistance adjustment. With its Swift Play system, a handlebar-mounted controller that allows riders to shift gears virtually.
However, SRAM’s advantage lies in its wireless shifting technology. If SRAM integrated bike-mounted shifters directly with the trainer, it could provide a seamless indoor riding experience. This innovation will represent a major leap forward in smart trainer design.
SRAM’s design, likely the company’s first turbo trainer, aims to address the limitations of existing trainers, which are divided into Off-the-ground and on-the-ground categories.
In the first case, the user must remove the rear wheel, which usually requires a separate freewheel, as well as adjustments to the derailleur.
Wheel trainers do not require removal of the rear wheel, but may cause wear on the tires, which are typically used for resistance. In order not to damage road tires, wheel training bike users tend to install separate training tires on their bikes.
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“In both cases [wheel-off and wheel-on]“,Mounting a bicycle on a trainer may require significant mechanical prowess, time, and additional bicycle parts,” the SRAM patent states. “Additionally, various components of any type of trainer can experience additional wear and tear, whether in the driveline or on the rear tires.”
(Image source: USPTO/SRAM)
SRAM’s proposal allows users to leave the rear wheel on the bike while bypassing the freewheel and rear wheel. This means tire and flywheel wear “may be significantly reduced,” the patent says.
“Additionally, the bike can be quickly and easily installed on the trainer without the need to remove or adjust various components.”
As with all patents, there is no guarantee that the product will become a reality. The patent application means that SRAM has protected the design and can do with it what it wants.
Last month, SRAM also announced a “Smart wheel accessories” – Bicycle wheels with integrated sensors that feed back real-time data on tire pressure, rim health and wheel tilt.
Cycling Weekly SRAM has been contacted for comment on the indoor trainer design. In the past, a SRAM spokesperson has said the company does not comment on patents.
