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Rear mech flicking forwards under power

Nick CodNick Cod Posts: 321
edited February 2014 in MTB workshop & tech
So fitted a brand new chain and cassette to my trusty old hard tail. Checked the gearing, made some minimal adjustments and all seems fine on the bike stand.

However when pedalling the bike I can only describe it like the chain has a stiff link as the rear mech keeps flicking forward on every revolution. I've checked the chain and it appears fine, I've also replaced the rear mech but it hasn't made any difference

I'm pretty stumped, any help would be appreciated
2016 Cube Agree C:62 SLT DISC
2013 Cayo Evo 3
2013 Zesty 414
2002 Avalanche 0.0
2018 Vitus Substance v2 105 Gravel


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