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12 Speed SRAM Derailleur and Cassette Compatibility Issues

  • 08-04-2023 3:55pm
    Registered Users Posts: 2,563 ✭✭✭

    Bought a bike with a SRAM Rival eTap AXS XPLR Max 44T derailleur which came with a SRAM Rival, 12-speed, 10x44 cassette. Electronic shifting, works perfectly.

    Bought a second wheelset and fit a SRAM XG1250 Rival AXS 12s/10-30t cassette. While shifting in the 6 smaller cogs works fine, the behaviour when shifting into the larger ones is erratic:

    • When coming down it won't go into the second largest, click again and it skips it going direct to the 3rd largest
    • Slow shifting to larger cogs on the 6 biggest cogs while shifting to larger on the 6 smaller ones is snappy
    • Usually won't go into the largest cog

    From I see

    While the XPLR rear derailleur was designed for use with the 12-speed 10-44T cassette, it will work with 12-speed 10-36T cassettes as well. The chain length and b-gap distance will be different between cassettes- be sure to check out the user manual for full installation instructions that are specific to your gearing choice.

    SRAM XPLR drivetrain parts are compatible with existing 1x 12-speed road cranksets, 1x 12-speed chainrings, and Flattop 12-speed chains. The XPLR rear derailleur works with 12-speed 10-36T and 10-44T 12-speed cassettes.

    This sounds like they are saying they only support 2 cassettes. Anyone any idea what is going on ? I would have assumed that once the spacing between the cogs is standard and the derailleur supports the max cog size there should be no issues.