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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 04-22-05, 08:16 AM   #1
noumena9
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did I wreck my hub?

I've got an issue with my Paul rear hub that I'm having trouble diagnosing. Maybe it's not the hub, but I think it is.

Only when I'm riding and only when I'm cranking pretty hard I hear a periodic metallic thud sound coming from my rear wheel area. It isn't loud but it is pretty audible. I cannot seem to make the sound happen at lower speeds. Because I need to be moving and working to make the sound it could be from my cranks or bb or something else, too, I suppose.

I'm wondering if this is the sound of my bearings dying.

Paul high flange, new chain, Sugino 75 cranks and Sugino bb.

I'm taking it to get looked at tomorrow, but I wondered if anyone here had any ideas. thanks.
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Old 04-22-05, 08:17 AM   #2
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I had a similar issue with my Surly bearings (rear hub) so I replaced them and it all went away. Just like my childhood...
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Old 04-22-05, 08:21 AM   #3
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Sounds like a bearing - get em switched out for cheap and see if that solves it.
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Old 04-22-05, 08:21 AM   #4
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Sounds like it could be the chain. I only say this because I had been hearing a mysterious thud from my drivetrain since last Saturday and I couldn't figure out what it was. Last night I was on my way out for a ride and the chain broke(scary, scary experience). It's funny because you can feel it in your feet and sometimes it feels like it is coming from the BB or even the non-drive side crank. If you added/removed links in your chain recently I would consider a new chain if you can't find a weak/seized link in your existing one..
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Old 04-22-05, 08:33 AM   #5
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might chain tension have something to do with it? that is, if it is super tight or not?
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Old 04-22-05, 08:34 AM   #6
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Ack - that's true, as jinx and neuron said - could be the chain binding. Got a spare chain to try?
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Old 04-22-05, 08:48 AM   #7
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When you say new chain do you mean you just replaced it? Is the rest of the drive train old?
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Old 04-22-05, 08:54 AM   #8
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Check a couple of things.

1. Chain ring bolts
2. Take the wheel off and spin it while holding onto the axle to see if you can feel any grinding when it's not under load. While you may not get the clunk, you may be able to feel if something is awry with the hub.

I had a similar problem that was a result of a bearing that had split. Cheap carbon bearings!
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Old 04-22-05, 11:58 AM   #9
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the drive chain is about 600 miles old, including the chain. pretty new. the chain is kind of tight and has been for a while, but there is still play in it... it is not taught, but it makes a straight line, if you know what I mean.

I'll give it a once over and try all the suggestions you all have made. Thanks!
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Old 04-22-05, 01:43 PM   #10
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by straight line, you mean it doesn't sag or droop, right? i'm guessing you're not talking about chainline...

btw, do you want some paint?
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