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Old 05-07-09, 02:57 PM   #1
DnvrFox
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Soft Sounds = Big Danger

Soft Sounds = Big Danger

A soft, wheel-speed whoosh, whoosh got my attention today. Finally determined to be back wheel. Upon inspection I could find nothing except that the wheel was somewhat out of true, and the sound was coming from near the hub. That was the end of my mechanical ability to further define the problem.

Rode to the LBS (3 miles), and, upon close inspection, what do you think they found??

OK, guess away!!









































































Moral - never ignore those soft unexplained sounds - I believe this sound was caused by play in the spokes as they rubbed against each other. There were about 4 of these longitudinal cracks on the wheel. 30,000 miles and 10 years seems to be the limit!

It was fixed on-the-spot with a new wheel. However, I will never be able to match the red-rimmed original Mavic wheel!

Last edited by DnvrFox; 05-07-09 at 03:08 PM.
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Old 05-07-09, 03:12 PM   #2
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When I only had one mountain bike and no other bike- I knew the sound of it- and from experience any sound that came from it meant something as I had probably had it before. Then I got into multiple bikes and new sounds were ---new.

Used to take me ages to find out what was causing the "New" sound- but luckily it was normally just a bit of adjustment somewhere. But one did get me- A clicking sound coming from the front of the bike when I turned the bars under load. Changed the headset bearings- Adjusted tension on the stem- Tightened the bars on the clamp- And still there. I now know that sound so well that when another rider asked me what the sound was on the front of his bike a couple of weeks ago- I told him to either put his bars down to the level he had them at before he adjusted them up- Or put new- longer outer cables onto his gear cables.


Bet you recognise that sound and know the cure in another 30,000 miles when it occurs again.
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Old 05-07-09, 04:01 PM   #3
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I too had a new vibration/sound

HI,
My new sound was a vibration from the front wheel, it would increase if I mashed the pedals and stop from time to time,
It was a spoke coming loose from the wheel it finally came completly free.
The wheel didn't wobble but I had it fixed before the next ride., New wheels cause I was getting alittle tired of my re-occuring wheel problems.
Doug
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Old 05-07-09, 04:23 PM   #4
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30,000 miles... time to replace everything anyway, eh? I believe the Velocity Deep V wheels come in many colors, probably including red, FYI. There is also the new "Bassboat" color. Glad there was no crash or physical harm.

http://www.velocityusa.com/default.asp?contentID=550
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Old 05-07-09, 04:32 PM   #5
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Last week, I had a thhhuuuup , thhhuuuup sound from the rear wheel when riding to the group ride start. Great, a tire going flat, now I'll be late. No - it was a bandaid stuck onto the tire.
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Old 05-07-09, 05:03 PM   #6
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Originally Posted by stapfam View Post
Bet you recognise that sound and know the cure in another 30,000 miles when it occurs again.
Ha!

He'll be lucky to remember it by next week!
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Old 05-07-09, 05:10 PM   #7
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Ha!

He'll be lucky to remember it by next week!
What was I supposed to remember?
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Old 05-07-09, 05:33 PM   #8
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Originally Posted by billydonn View Post
30,000 miles... time to replace everything anyway, eh? I believe the Velocity Deep V wheels come in many colors, probably including red, FYI. There is also the new "Bassboat" color. Glad there was no crash or physical harm.

http://www.velocityusa.com/default.asp?contentID=550
I sure wish I had the $$$ to do that. However, over the years, things have been replaced on a as-needed basis, so the drive train is in good condition, etc.

Interestingly, I still have the original chain rings and most of the original cogset. I do have them checked periodically for wear, and I have my chain changed religiously.

For now, this is my lifetime bike!!

I am glad I REALLY like it.
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Old 05-07-09, 07:22 PM   #9
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I thought you were going to tell us that it was that pot of rocks.
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Old 05-07-09, 07:31 PM   #10
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Lightweight components have a limited lifespan, and periodic safety checking is crucial.
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Old 05-07-09, 07:56 PM   #11
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I've noticed that the happy humm of my bike is getting a little louder.

Don't know what it is. It could be the bottom bracket ?

Michael
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Old 05-08-09, 06:05 AM   #12
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Lightweight components have a limited lifespan, and periodic safety checking is crucial.
+1

I'm curious.

How many of you regularly check your wheels for cracks near the spoke holes?

To be honest, it never occurred to me.
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Old 05-08-09, 07:08 AM   #13
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Quote:
Originally Posted by DnvrFox View Post
+1

I'm curious.

How many of you regularly check your wheels for cracks near the spoke holes?

To be honest, it never occurred to me.
I don't do anything regularly, but I do check them now and then.

I have a question for the wheel building experts out there. We've all been told a thousand times that low spoke tension is what causes broken spokes. Is this the other side of the coin? Does excessive spoke tension cause rims to come apart?
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Old 05-08-09, 08:58 AM   #14
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When you inspected, did you have the wheel in the air and were you turning the crank by hand? or did you somehow inspect while riding?

Broken chainstay or seat stay - the sound was due to vibration of the unsupported stay.
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Old 05-08-09, 09:09 AM   #15
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I don't do anything regularly, but I do check them now and then.
Irregularlity was bought up on another posting
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Old 05-08-09, 09:17 AM   #16
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I don't do anything regularly, but I do check them now and then.

I have a question for the wheel building experts out there. We've all been told a thousand times that low spoke tension is what causes broken spokes. Is this the other side of the coin? Does excessive spoke tension cause rims to come apart?
I recently posted about a case of a well-known online bike shop building my wheels with insanely high spoke tension that resulted in cracks forming around the spoke holes...and then refusing to cover them in warranty.
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Old 05-08-09, 09:39 AM   #17
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Originally Posted by rm -rf View Post
Last week, I had a thhhuuuup , thhhuuuup sound from the rear wheel when riding to the group ride start. Great, a tire going flat, now I'll be late. No - it was a bandaid stuck onto the tire.
Chewing gum pretty much does the same thing, but messier.
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Old 05-08-09, 09:50 AM   #18
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When you inspected, did you have the wheel in the air and were you turning the crank by hand? or did you somehow inspect while riding?

Broken chainstay or seat stay - the sound was due to vibration of the unsupported stay.
I had the bike standing on the front wheel, and the rear wheel in the air, with my ear next to the wheel. What made it confusing was that the noise was easily hearable when riding, but I could hardly hear it when there was no weight on the bike.

I am confused about the statement you made about a broken chain stay? There was no broken chain stay or unsupported chain stay.

The noise went away upon the mounting of the new wheel. The sound was clearly near the hub area - I could put my ear right to the area and isolate it. I thought it was something inside the hub.

Please explain more????????????

Thanks.
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Old 05-08-09, 09:51 AM   #19
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Originally Posted by DnvrFox View Post
+1

I'm curious.

How many of you regularly check your wheels for cracks near the spoke holes?

To be honest, it never occurred to me.
I've cracked so many wheels that I check them every time I clean the bike. I have been using my old bike as a rain bike and the last time I rode it there was a lot of noise from the rear wheel.
Since it was raining I figured it was grit in the drivetrain. This week I cleaned the bike and found 8 cracks in the rim.
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Old 05-08-09, 10:14 AM   #20
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thanks for the heads up. cracked rims! what will they come up with next?
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Old 05-08-09, 10:36 AM   #21
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Reminds me of the cracks on my rear MA-40 riim after 10 years of great service. I didn't hear a sound. I noticed my wheel thumping and when I stopped to check it, I saw that the rim had cracked on either side of one of the spokes, allowing it to pull away from the rim. Upon further examination I saw tiny little cracks in several places on both rims. I did some research and found that many people thought that hard anodization of the rims, which was very popular at that time, caused rims to be more brittle and more prone to tyhat sort of cracking. Don't know if that's true, but I have avoided hard anodized rims ever since.
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Old 05-08-09, 07:15 PM   #22
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Quote:
Originally Posted by DnvrFox View Post
+1

I'm curious.

How many of you regularly check your wheels for cracks near the spoke holes?

To be honest, it never occurred to me.
I check about once a month. That may be excessive but I buy my wheels from Max's Madd wheels and you can never be too careful............
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Old 05-09-09, 03:44 AM   #23
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I tend to be pretty obsessive about strange noises. Our kids weren't allowed to make strange noises while I was driving. I listen to anything new. The only issue now is that many of the strange noises are coming from me!
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Old 05-09-09, 08:05 AM   #24
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Chewing gum pretty much does the same thing, but messier.
Avoid rolling over those little packets of half and half too. I rolled over one and lost all my brakes. The fat in one pack is enough to cover your whole rim. Then you have to wipe it ALL off before the brakes will work again.
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