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It's a trek x-cal 6 I just picked up today. Trek website spec'd x4 for both derailleurs and shifters. It came with x5 RD, altus FD, and mystery sram shifters.

They don't look like any x4s I can find online, or any other shifters on the sram site. The indicators seem x7 style, but they are pretty plasticy. The also say impulse technology under the brake lever.

I was planning on ditching them, but I'd like to figure out what they are.





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They look like my son's X-5 and are a few years old. I have X-5 and X-7 from the same era and the only difference I can see is the X-7 had an aluminum big lever. My son loves them and won't let me swap them out even though I have better shifters for him.
 
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