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Resonance and drivetrain noise

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Resonance and drivetrain noise

Old 07-07-08, 11:20 AM
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jberenyi
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Resonance and drivetrain noise

I like to start a thread regarding my experience with a Lynskey Titanium Level 3 Custom frame. First off, let me say this bike is hot looking, rides great, its super light, stiff and has great balance. I chose Ti because I work with it everday in my day job as an engineer for an aerospace company. Titanium is a wonderful material but has its issues of which one really bothers me at times on my bike. Something I never knew about till I rode my newly built up De Bernardi SLX frame is that the Ti frame has a resonance factor that could bother some. I always found that my Record 10spd derailleur sounded much different at high cadence than my steel frame bike at the same cadence factor. My steel frame bike has a Centaur rear derailleur and maybe this is the difference. In any event, the steel frame always seems quieter in the rear than my Ti bike. This weekend I did a sound level check thinking I could justify my claim and found both ran at 64 db at about 80 cadence with the chain on the large chain ring and the fourth cog up from the smallest on the rear cassette. I was dumbfounded and decided that since both were the same decibel rating then it must be the tone is different. The ambient tone of the steel frame is much lower and has a deadening effect. The Ti frame gives off a more spirited tonal quality that seems to magnify a more mechanical sound. Of the two I love the De Bernardi's sound quality the best. In fact I love the ride of that bike so much I battle with myself over choosing which bike to ride for the day. I have even thought of selling the Lynskey frame to have Tomassini build me a custom steel frame but I don't have the guts to do that type of venture yet. One of these days I wake up and just do it but for now the Lynskey stays.
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Old 07-07-08, 12:06 PM
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Pedaleur
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Originally Posted by jberenyi View Post
I like to start a thread regarding my experience with a Lynskey Titanium Level 3 Custom frame. First off, let me say this bike is hot looking, rides great, its super light, stiff and has great balance. I chose Ti because I work with it everday in my day job as an engineer for an aerospace company. Titanium is a wonderful material but has its issues of which one really bothers me at times on my bike. Something I never knew about till I rode my newly built up De Bernardi SLX frame is that the Ti frame has a resonance factor that could bother some. I always found that my Record 10spd derailleur sounded much different at high cadence than my steel frame bike at the same cadence factor. My steel frame bike has a Centaur rear derailleur and maybe this is the difference. In any event, the steel frame always seems quieter in the rear than my Ti bike. This weekend I did a sound level check thinking I could justify my claim and found both ran at 64 db at about 80 cadence with the chain on the large chain ring and the fourth cog up from the smallest on the rear cassette. I was dumbfounded and decided that since both were the same decibel rating then it must be the tone is different. The ambient tone of the steel frame is much lower and has a deadening effect. The Ti frame gives off a more spirited tonal quality that seems to magnify a more mechanical sound. Of the two I love the De Bernardi's sound quality the best. In fact I love the ride of that bike so much I battle with myself over choosing which bike to ride for the day. I have even thought of selling the Lynskey frame to have Tomassini build me a custom steel frame but I don't have the guts to do that type of venture yet. One of these days I wake up and just do it but for now the Lynskey stays.
At what frequency is the fundamental vibration?

(PS. Non-engineers use paragraphs.)
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Old 07-07-08, 12:24 PM
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[QUOTE=Pedaleur;7014781]At what frequency is the fundamental vibration?

QUOTE]

Good question...I have no idea.
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Old 07-07-08, 02:37 PM
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Your real test would be to notice the sound of the Ti frame with the same drive components from the steel frame bike. Each component has it's own signature resonance when it comes in contact with the chain, from the crank to the cog. Perhaps you have a particularly noisy component that's causing most of the sound. Could be the crank, could even be the chain. Could also be the lubricant (or lack of) on the chain.
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Old 07-07-08, 04:10 PM
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Originally Posted by KiddSisko View Post
Your real test would be to notice the sound of the Ti frame with the same drive components from the steel frame bike. Each component has it's own signature resonance when it comes in contact with the chain, from the crank to the cog. Perhaps you have a particularly noisy component that's causing most of the sound. Could be the crank, could even be the chain. Could also be the lubricant (or lack of) on the chain.
The chain is clean and lubed with Pro Link. I checked it for wear and its okay. The crank is silky smooth. It shifts fine but the sound is just louder and I'm not used to it. I wonder if the derailleur is just manufactured differently. I checked and greased the pulleys but no change. I plan to have a shop check the hangar for alignment just for grins before jumping to other conclusions.
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Old 07-08-08, 01:04 AM
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Does it only make noise in that gear combo? (This is why I made the snide remark about paragraphs -- I'm unclear from your original post) Is it the frame that is resonating, or a component? It's easy to check the former just by pinging it and comparing the tone.

Otherwise, the wheels would be my first guess.


It's not the chain. I would doubt the chain ring. Maybe the cog -- which is why it's important to know when the noise occurs. Just start pinging things.
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Old 07-08-08, 06:54 AM
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I went to the Pro Shop last night and had the mechanic check the chain for wear and it was at .25 on the gage. So the chain is fine. He also checked the hangar alignment with the DAG-1 tool and he said it was the best he has ever seen (Lynskey makes awesome frames). So my comfort level is doing much better now. I really believe that the bike just has a different tone quality than my steel bike and it has its own unique signature.
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