I’m reassembling a used unicycle, and I’ve noticed that there’s a soft “rattle” or “trickle” or “clattering” sound when I turn the wheel next to my ear. It sounds like some smaller particles hit metal very softly, maybe as if there were fine grains of sand in the rim or something similarly unlikely. I’m not sure, the noise doesn’t come from the hub / bearings, but from somewhere along the tire… and at least the noise sounds in rythm with the wheel turning. I also believe I’ve heard that sound on b*ke wheels before, but without knowing its cause there either.
(I should maybe add that the bearing caps probably aren’t yet tightened enough, but that’s another topic and I don’t think it’s the reason for this.) Right, and I’m hesitant to remove the tire and look because my levers are probably not sturdy enough to wrestle it over the rim and back… so unless I have to…
Any ideas as to what this is and if I should worry? Thanks for your help!!
(Maybe I’ve just not used the right key words, but I haven’t found anything searching the forum… although I searched even some thread of archeological interest (1999!!!).)