SRAM update means T-Type is now faster, but is it fast enough?

After years of riders noting that T-Type derailleurs slow down significatnly after 3-4 shifts, SRAM is finally providing a fix. The brand released Firmware 2.53.8, a free update available now through the AXS app, that improves Eagle AXS Transmission cassette mapping.

Cassette mapping: speed vs reliability

SRAM’s T-Type is designed to provide reliable and smooth wireless shifting under load. The initial release prioritized the speed at which SRAM thought it could best deliver shifting under load and, the brand says, long-term durability. The new update comes after further testing that it says shows it could preserve both those features and still offer faster shifting.

Cassette mapping refers to the combination of the brands “X-Sync technology” on the cassette and the sequence of derailleur movements controlled by the AXS firmware. The timing of the derailleur’s movement, SRAM says, uses a “shift sequence” with “specific timings that let the chain move across the cassette while maintaining full engagment.” That is, the chain must fully engage with one cog before AXS will let it start moving across to the next cog. In contrast, Shimano’s HG+ is designed to allow the chain to engage while also continuing to move the chain accross the cassette.

Firmware update 2.53.8

The update means, SRAM says, ” that on successive shifts of three or more, the derailleur will move quicker between gear positions.”

That is, the brand quickly clarifies, not the same as saying that Eagle Transmission will shift quicker.

“It can speed up successive shifts of three or more, but this is largely dependent on the cassette. Shifting between cogs is enabled by the rotational speed of the cassette in combination with the derailleur movement between gear positions. These are two independent movements, whereby the derailleur position must move first before the chain can be released to the shift lanes of the cassette to change between cogs. Firmware 2.53.8 is designed to align better with common cassette rotational speeds while you ride.”

Clear as day, right?

The update is, as mentioned, available freely on the SRAM AXS app now. We’ll report back as soon as we’ve had a chance to go ride outside.