Edit: What FrozenK said above. Your X-series derailleur requires shifters that actuate with SRAM's 1:1 cable pull (Shimano uses 2:1 ratio). If you're looking for a bargain on Amazon, you may also encounter Sunrace shifters - - these are also not compatible, as they also use Shimano 2:1 ratio.
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Last edited by dminor; 07-29-16 at 11:41 AM.