A prototype of a new Sram E-MTB motor based on a completely new concept was apparently spotted at Crankworx in Whistler. While the current Sram Eagle Powertrain still uses a Brose motor, Sram now appears to be developing its own drive unit. The design of the prototype seen largely corresponds to the concepts that Sram has already described in its own patents. Here is the original message on Pinkbike's Instagram channel:
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Cycloidal gear unit as the technological basis
The new motor unit apparently utilises a cylindrical design with a cycloidal gear. Sram has applied for a patent for this. A similar design can also be found in the HPR system from TQ and the new Centrix engine from ZF. Compared to the TQ motor, however, the new Sram unit appears larger.
This and the number of battery cells shown in the patents indicate that Sram is unsurprisingly developing a classic full-power e-bike system. The component specialist had already signalled that this would come at some point with the launch of the Previous Eagle Powertrain indicated.
High performance and optimised battery position
Exciting: The position of the battery described in the patents was apparently realised in the prototype we saw. The design allows the battery to be inserted into the down tube in front of the motor. This should ensure a removable battery and a low centre of gravity with low weight. Compared to the previous powertrain, the prototype system is much more compact and should enable lighter bikes.
Outlook for the market launch
The prototype spotted is apparently a test sample for road tests and not a production-ready model. This suggests that it could be a product for the 2027 model year (or later), which we may not learn more details about until later in 2026.
The fact that numerous prototypes were spotted at the Crankworx Bike Festival is no coincidence: many of the largest original equipment manufacturers (parts manufacturers) meet their customers (bike brands) at this event to test ride and finalise purchases for future model years.
There are also professional athletes who test products and brand employees who ride bike park laps with unreleased products. All of this makes Crankworx Whistler a hotspot for discovering new technologies.
Adrian Kaether
Editor
