[oldskool_XC]

You said it is happening when you are coasting? Is it happening when you are pedaling too? Check the seat post seat clamp for dirt, my thompson needs periodic lube to keep it quiet. Also, check stem and handle bar clamp for the same. If it is happening when pedaling then maybe the BB needs to be cleaned and lubed and/or crank arms. Let me know if any of this helps. If not try to narrow down the location of the noise a bit, i.e. front, rear or high, low on the bike. Hope this helps! 😕

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