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13 votes
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New bike is making rattling noise

The noise happens every time your foot is in the same point of rotating the pedal. It sounds to me like the chain is catching on the front derailleur once per rotation. Not unusual and not difficult ...
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6 votes
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Chain clanking whenever I start to pedal

First, with the rear wheel held off the ground, or the bike upside down turn the pedal by hand while inspecting the chain and rear derailleur. Likely issues: The chain tries to shift to another cog ...
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  • 45.2k
6 votes

Replaced chain and cassette, now new chain slips in a specific gear

You have a mid-drive (Bosch) motor according to search, in my experience these can be very hard on drivetrains, for two reasons. One, the motor puts the extra torque through the chain and cassette, as ...
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4 votes
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Replacement chain for old Shimano 3x7 STX

Shimano's STX groupset utilizes hyperdrive and Dual SIS technology, so the Shimano chain, CN-HG40 would be an excellent choice for the 7 speed drivetrain you have. Shimano chains in speed classes 7 ...
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  • 6,868
4 votes

Chain clanking whenever I start to pedal

Optical illusion is always a possibility when looking at these types of photos. But that said, that large chainring looks extremely worn - the teeth aren't supposed to be pointed. Combined with the ...
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  • 12.8k
3 votes

Replaced chain and cassette, now new chain slips in a specific gear

The chain should not touch the frame of the bike at all. It will destroy the frame of the bicycle. The shop should never have returned the bike to you in that condition. Request to speak with the ...
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  • 451
2 votes

Chain clanking whenever I start to pedal

That's a triple chainset, and the grannie hasn't been used in a long time, if ever. Compare the curve of the teeth using a suitably-sized fingertip as a gauge. If there's significant difference in ...
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  • 96.5k
1 vote

Chain protector?

That is a chain case, not just a bolt-on guard. The bike looks like a single speed or an IGH, so there is no cassette or derailleur and only one chainring at the front. The case is an integral part ...
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  • 96.5k
1 vote

Putting pin(s) back into chain

You can't put an ordinary pin back in with today's chains unfortunately, but if the chain is of the type that takes reinforced pins, you can put a NEW UNUSED reinforced pin in. It costs slightly more ...
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