Try any of the following....
Loose crank Loose chain-ring bolts Loose bottom bracket
Or have you had a tumble recently? Could also be a misaligned rear wheel or bent chainring
@Aroogah started
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Try any of the following....
Loose crank
Loose chain-ring bolts
Loose bottom bracket
Or have you had a tumble recently? Could also be a misaligned rear wheel or bent chainring