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Discussion Starter · #1 ·
So I have 2019 stumpjumper st I switch over to sram nx groupset from the stock setup had the bike shop size the chain and the bike rode quite on the trails for a few weeks and now every berm or rough section the chain slaps so loud and my gf watch the derailure and she said it stays tight and the top chain smacks the the chain stay protector and my cassette also digs into my chain stay protector had to trim it down a lot any idea would help a lot and I’ve searched for days about chain slap for the new stumpy can’t find anything
 

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as for the slap, no idea. But I'd check that the cassette is torqued up proper. I've been riding my GX casette for months, chain really close to the seatstay (1mm). Tried tightening the cassette more, and now I have about 5mm..
 
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