• In order of likelihood, I's suggest, pedals, freewheel (looks like a shimino), bb.

    As a general point, I'd suggest chain cleansing / lubrication, check chainring bolts and check no tight spot when rotating the crank.

    I don't understand why peple don't like the half link. It is much more airodynamic than an ordinary chain (at leaast if you had it on the other way round).

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