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I have a 3x9 gear setup on my hardtail. All SLX apart form the chainset, which is raceface Deus XC. I have an ongoing problem with the chain jumping off the middle chainring and on to the granny ring when heavily torqued or pedalling wilst riding fast over very rough ground - which is annoying, and in some situations, dangerous. All the transmission, apart from cranks & chainrings, is brand new - I had this problem before replacing it, too.
I replaced the middle chain ring about 8 months ago with a TA ring, which has since had a tooth bent and subsequently hammered flat.
Anyone had this prob before? Is it a front mech alignment issue? Do I need to replace the chainring? Is this symptomatic of frame distortion?
Any advice appreciated.
thanks
Chain too slack so not being held in place by the mech springs?
I don't think so, it happens across the cassette.
Front mech
At a guess its either a worn middle ring or the front much cage isn't parallel to the rings.