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Old 07-20-10, 07:14 AM   #1
Captain Rich
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What would cause a vibration in the rear hub of a single speed beach cruiser? You can feel it even
when walking the bike. The vibration seems to propagate to the handlebars when riding.

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Old 07-20-10, 07:20 AM   #2
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Twenty to one your chain is too tight. Chainrings and sprockets aren't perfectly concentric, and it's easy to over-tension the chain if you set the wheel while in a low spot.

Turn your pedals while feeling tension in the middle of either section. At the tightest point ease the rear wheel forward so there's a minimum of 1/16" of free play up and down across the chain. Or there should be a few degrees of free play in the crank with the rear wheel locked.
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Old 07-20-10, 07:48 AM   #3
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Assuming it's a single-speed, not a fixed gear, and you feel the vibration when walking the bike when the chain isn't moving, a tight chain may not be the cause.

Check both tires to be sure there isn't a bulge or something caught in the tread. If the tires are good, spin both wheels to see if there is damage or a flat spot in a rim from an impact. Finally, remove the wheels and spin them to see if the hubs are bad or an axle is bent.
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