Chain slaps when stop pedaling?

roubaixtom
roubaixtom Posts: 316
edited May 2015 in Workshop
HI,

I have a shimano Ultegra 6800 drivetrain with DT Swiss R23 wheelset, all pretty new.

For some reason the when i stop pedalling after a spring for example the chain slaps on the chain stay?

Also, when walking with the bike the pedals move around with the wheel?

Why is this?

Cheers

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