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Usually when the chain is on the biggest gear, whenever I push the pedals too hard, i hear a "cracking" sound from the front gear. I am not sure how to describe the sound, it sounds kinda like the sound that comes from switching gears. It also happens when riding over bumps or potholes.

This is really annoying, since i can't pedal fast.

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    There are far too many ways for a bicycle to make noises like that for anyone here to do anything more than guess at what's causing your problem. The more specifics you can provide, the more likely you'll get something useful. What gear(s) are you in when the noise happens? Does your bike even have multiple gears? Is the noise synchronized with your pedaling? If so, how? Like, "when I push down on the right pedal" or "When the left pedal is at the bottom". A video with sound would also help, but be careful trying to record one. That's a good way to ride into something. Aug 6 at 14:12

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It would help a lot to know your crank brand and model and how many gears your bike has (to further narrow down your model).

The past few Shimano hollow drive-side crank arm generations are known to separate and they might crank first.

Try checking the chainring bolts. Sometimes these are located on the back side of the crank arm. They need to all be tight. There should be a light coating of grease on all the interfaces between the chainring, crank and bolts. If your chainring has ever been removed it’s likely it wasn’t greased properly. If I’m doubt, regrease and reassemble.

Other likely culprits are bad bearings in the pedals, bottom bracket, or rear hub. It could also be the cassette, free hub pawls, seat, seat post, frame, etc. There’s a near endless possible causes.

You really have to closely inspect the bike and do trial and error, eliminating as many potential root causes as possible. I would suggest removing your chain (from the chainring, it can stay on the bike) and trying to recreate the noise while standing on the pedals (hold onto a poll or doorway). If you can get it to make noise then, then the root cause is likely in the crank or bottom bracket or frame.

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  • Also check the crank bolts. I've had related creaks caused by pedal bearings, a loose crank bolt (same old bike), and very slightly sloppy BB bearings. Even rear hub problems can sound like they're coming from the BB.
    – Chris H
    Aug 13 at 14:59
  • Chainring bolts - yeah that's happened to me...
    – Dan Gao
    Aug 16 at 1:39
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Even the saddle can creak in rhythm to heavy pedaling. You can test this by standing and seeing if the noise continues.

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  • Welcome to Bicycles SE. Could you expound on your answer, with possible ways that a creaking saddle could be eliminated as a noise generator in this situation? And possible solutions to the resolve it. Exchange sites, including this one, are not typical forums. Take the tour to get a feel for how to generate a good answer to fit the format.
    – Ted Hohl
    Aug 13 at 6:08
  • Welcome to the site - you're right, but can you expand this with more info?
    – Criggie
    Aug 13 at 8:07
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A different suggestion. You say it happens when going fast in top gear. The chain will be relatively unloaded by both your pedaling and the derailleur tension. It also happens when jarred by road irregularities. Likely the chain is slapping against the front derailleur, perhaps the top. You might be able to change things by removing a link (check your big/big combo of course).

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