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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 03-15-06, 01:12 PM   #1
chancho
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Hit a pothole hard, heard funny cracking sound.

The other day I was doing probably 22-23 mph when I hit a fairly deep pothole. When the front wheel hit I heard a sound like something breaking. I was sure I broke a spoke or at least got a flat. I stopped to look and everything seemed fine. Standing still, I picked up the front wheel and slammed it down to test it, and I heard the sound again. Kind of like something made of plastic breaking, coming from the wheel. Tried it a few more times and nothing happened. Finished my ride (maybe 20 more miles) and didn't have any problem. Stopped at the LBS and they didn't see anything.

Has anyone else had this happen? Should I be concerned? It's a new Giant OCR3 carbon frame and fork.

Thanks
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Old 03-15-06, 01:19 PM   #2
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Several years ago I bunny-hopped some tracks and came down hard with a noise like you are describing. I broke the steerer of the fork. Pull that puppy out and have a good look at er.
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Old 03-15-06, 01:28 PM   #3
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While I haven't had any experience with the frames, hard impacts + carbon + cracking sound = bad. Did the LBS check out the frame thoroughly?
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Old 03-15-06, 01:31 PM   #4
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You have a carbon frame. you heard a snap, I would get the bike thouroghly checked.

Hell, once my steel frame made some god awfull crack sound, so I brough it in and got it checked.
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Old 03-15-06, 01:34 PM   #5
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Had a similar encounter with a rut on my Ti bike no flats but cracked a front wheel flange which I discovered a few days later when I took off the front wheel.
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Old 03-15-06, 01:40 PM   #6
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Did your handlebars rotate in the stem any? I had that happen to me once, hit a pothole while I was in the drops, made exactly the sound you describe. Wouldn't happen just banging the bike on the ground, though.

Like the others said, check that bike carefully.
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Old 03-15-06, 02:08 PM   #7
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There was no movement in or around the stem. I'll take off the front wheel and tire when I get home today. It really sounded like it was coming from the bottom of the wheel. May be similar to ccdisce's experience.
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Old 03-15-06, 02:38 PM   #8
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I had this exact thing happen to me. While you should very thoroughly check for cracks, for me it turned out to be the headset pre-tensioning bolt had loosened ( most likely, the star nut had slipped ). Try tightening/readjusting the headset and whacking on the ground again. If the noise goes away, loosen the bolt again to see if comes back. I did this several times to assure myself that this was truly the cause, because most anything else is obviously dangerous.

You can also put a different wheel in to see if that makes a difference, which will tell you if it's the wheel or not.
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