Never heard of such a thing. I run my Sam 1x8 and occasionally throw my chain off the 40t front ring. I think it is usually going fast downhill, maybe shifting into the smallest rear cog while hitting a bump? I have a 26t ring up front for emergencies (used once in 2k miles) so I have been reluctant to put something up front. Being more careful on fast bumpy descents would help. Any other tips from you wise folks?
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