SRAM has just announced a pretty big update for the Eagle AXS Transmission users. The new Cassette Mapping firmware update promises improved shift speed – but only on certain shifts. Specifically, the firmware update increases multi-gear shifts by “reducing the time between successive derailleur shifts of three or more.”
Eagle Transmission Cassette Mapping is the combination of X-Sync technology on the cassette itself plus, the precise movement of the derailleur itself, which are controlled by AXS firmware.
These derailleur shift sequences feature specific timings that keep the chain fully engaged while moving across the cassette. This allows the rider to shift when and where they want.
SRAM says that this update is “based on years of additional post-launch testing and maintains the chain engagement standards that are required for the best shift under load.”
What Does the Firmware Do?
Firmware 2.53.8 basically installs a timing update to the Cassette Mapping Multishift intervals. What this means is, on successive shifts of three or more, the derailleur will move quicker than it did before between the gear positions. This will be a pleasant update to all of the Eagle AXS Transmission line.
*This update makes it sound like your Eagle Transmission will shift faster, but will it?
Shifting your drivetrain successfully between cogs takes two independent movements. First, the cassette itself must rotate, and second, the derailleur has to move the chain between the gears. The derailleur must move first before the chain is released onto the ramps or “shift lanes” of the cassette to change between gears.
So while the firmware update will speed up successive shifts of three or more gears, the actual speed of the shift is determined by the rotation of the cassette. It sounds like SRAM is claiming that while the derailleur will move faster from gear to gear, the speed of the shift itself could be faster, as long as the cassette is spinning fast enough. Officially, SRAM states that “Firmware 2.53.8 is designed to align better with common cassette rotational speeds while you ride.”
Use the App To Update Your Firmware
You can update your firmware using the SRAM AXS APP easily. Follow the instructions found here.
