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I converted a freewheel from 6 speed to single speed. It took a few goes getting the tightness right but I’m pretty sure I couldn’t feel any resistance while it rotates.
Yet when I ride the bike I feel a refurb going up to the seat post on every rotation (It’s not related with peddling). I can’t feel anything whilst it’s in a stand it’s only while I’m riding it.
I noticed that the tyre had a bulge but I got rid of that and didn’t understand how that could create a refurb if it wasn’t hitting anything.
Could it just be the frame as it’s an old steel one that has been cold pressed recently?