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1x AXS drive chain makes click noise only in highest gear

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1x AXS drive chain makes click noise only in highest gear

Old 06-15-21, 02:26 AM
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Bikerwalker
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1x AXS drive chain makes click noise only in highest gear

This is my first post on the forum and it turns out to be a help ticket..

I recently put together a new 1 x bike, all parts are new and SRAM RED AXS, now here is the weirdest thing.

If I shift to the highest gear, the crank seems to make random unpredictable clicky noise and it doesnít matter how fast I ride or how much power I push, itís not in any regular interval and itís not a squeaky noise, more of a loud clunk noise a torque wrench make and I can feel the vibration from my feet, so this could also be the chain or the derailleur or the cassette.

If Iím using any other gear, at heavy load and full force standing up hill the whole drive train makes no noise and is completely silent.

I also canít reproduce the noise in a bike stand when the drive chain is spinning free or with moderate brake resistance, so the noise is only there when Iím riding.

From the description above I believe the noise isnít from the bottom bearing, seat post or pedal, it also doesnít make sense it is the crank as the crank is a none flex object. I also checked my cassette and ensure there is enough space between the last cog and the frame so itís not the chain hitting the frame.

At this point Iím thinking to mount a go pro camera on my seat post looking at my rear derailleur and chain in high FPS and see what the hell is going on, but any other insight is super appreciated.
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Old 06-18-21, 08:22 AM
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Bob Dopolina 
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Some 1x setups have chainline issues.

If your bike frame is spec'd with a road group but uses an MTB hub, the hub chain lines are different. Road is 41.5mm while MTB is 44mm. This pushes the chain 2.5mm further outbound and can create problems like loud, clattery drivetrains, chain drops, chain slips or it can decrease shifting performance.

Have a look at your chain line and see if it is the problem or perhaps a contributing factor to the problem.

Good luck.
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