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Rear Wheel Bead/Rock Sounds in Tire?

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Rear Wheel Bead/Rock Sounds in Tire?

Old 02-13-18, 08:41 PM
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Muggz
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Rear Wheel Bead/Rock Sounds in Tire?

Wasn't sure if I posted this in the right spot previously:
I just received my Merax Finiss bike from Amazon today, and as I got it out and began to rotate the tires, there is a bead/rock noise in the back tire that sounds like they fall to the bottom as I rotate the tire. I have no idea what it could be as this is my first bicycle I've had since I was young.
My friend ordered the same bike and his does not do this. I'm not sure what to do or if I should just return it. Thank you in advance for any info you may have!!
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Old 02-13-18, 09:51 PM
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GrainBrain
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Is there a spoke protector on the back tire? Is it slightly loose? Only wonder because I was chasing a noise on my bike that turned out to be this.
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Old 02-13-18, 10:05 PM
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I don't see any specs online for your bike, no way to tell what kind of rims and hubs it has, so these are just a few guesses.

First, check the spoke tension. Just gently wiggle each spoke. Don't try to bend anything. You're just checking for anything obviously loose, like a spoke and nipple that detached or broke inside the rim or at the hub.

If that's not the problem...

Take off the rear wheel and, with the wheel stationary, spin the hub axle (not the quick release skewer) between your fingertips, like you're turning a combination lock dial. It should spin easily and smoothly without feeling wiggly-loose or so tight that it's gritty and hesitates.

Listen for any slight ticking or pinging sounds. If you hear this, it's probably the ball bearings tapping together.

This may indicate there's not enough grease in the hubs. Hard to be sure without disassembling the hub to check. Probably best left to a shop, unless you have time to study some tutorials on basic maintenance and buy a few tools. Wheel hub maintenance is only moderately difficult, mostly just time consuming.

I encountered this ticking/tapping sound in the rear wheel of an older road bike I bought last summer. I expected it would need some basic servicing. The rear hub had grease but only a very thin layer, just enough to lubricate the bearings and surfaces, but not enough to keep the bearings from occasionally tapping and ticking. I cleaned and replaced the old grease with Phil's green stuff (used it for years, there are other good greases but I'm satisfied with tubes of Phil's for most stuff and don't need a big tub of grease). Problem solved.

If that's not the cause for the sound there may be something trapped between the walls of the rim, if it's a double wall rim. Maybe a pebble, stray nut, etc. Unlikely with a single wall rim.

If it's something trapped between the walls of a double wall rim, you'll need to remove the tire, tube, rim tape/strip, and wiggle and twist the rim around to see if you can dislodge whatever it is. Or just ignore it. Probably won't hurt anything.

But if it's a brand new bike and has a loose spoke/nipple and/or hub bearing, you might consider returning it or seeing if the seller will pay for your local bike shop to doing a safety check and basic assembly tuneup.

That's what I did when I bought used bike in 2015, after not having ridden a bike since the 1980s. I had no tools but needed the bike ASAP. It was quicker to let the nearest LBS check it for me. They included a re-check and basic adjustments within 30 days. Good for my peace of mind, and gave me time to acquire new tools and study some tutorials to re-familiarize myself with basic maintenance. Now I do most of my own work, although I'll let the same LBS mechanic do the tricky stuff because he's very good, an old school pro who knows tricks I never heard of.
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