#1
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Serotta ride quality issue...
Hey guys. I have a 2005 Serotta Legend Ti. It truly is a beautiful bike. I have about 18000 miles on it. I have slowly noticed (over the past 3 years) that once I hit 21 mph, all the way up to 30 that it has a vibration in the frame. The vibration started out as a high frequency, low intensity vibration. Truth be told, it has always had a subtle vibration since it was new. It has just been getting more noticeable.
A couple of weeks ago I happened upon a great deal on an S-works Tarmac that I couldn't pass up so I bought it and have been riding it for a couple weeks. Yesterday I thought I would take my trusty Serotta out for a ride and I immediately noticed how much it vibrated, very high frequency, very firm intensity. As soon as I go over 21 mph I notice it and it gets faster and stronger the faster I go. I was thinking, sheesh, have I been living with this for so long that I didn't realize it until I got on a new bike and rode without shaking for awhile? A couple of points for reference... 1.) I put a different set of wheels on the bike, the results where the same. Shaking with both wheel sets and at the same speed. I currently have a set of 3 year old HED Ardennes on it. 2.) Everything seems tight... 3.) Shaking appears to emanate from rear triangle and terminate in the handlebars. 4.) I had one crash a few years ago where I hit a pedestrian that jumped out in front of me. It pushed my front shifter (left side) to the side. It was fixed quickly just by loosening the bolts and repositioning the shifter. 5.) It shakes even if I stop pedaling and coast. I feel it is some kind of harmonic in the frame. Not sure, I am wondering what your thoughts are. I just know that it would be a shame to stop riding this thing for the shakes. Thanks guys... |
#2
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I've never dealt with a harmonic vibration like that before and would think that it would drive me a little crazy. I don't think I'd feel safe descending on a frame like that. Was the bike built for you?
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#3
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There is a great thread on this topic and David Kirk gives some great insight.
http://forums.thepaceline.net/showth...t=frame+wobble
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Cheers...Daryl Life is too important to be taken seriously |
#4
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Atmsao (according to my semi anonymous opinion) |
#5
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Does this model have the rear end with pivots? If so, could you have a worn/loose bushing?
I have had bikes with speed wobbles but I wouldn't have described the vibrations as high frequency. |
#6
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Speed wobble... first that I've heard of that word but to be honest with you it fits with exactly how I feel the bike is behaving. It is a standard 54 size frame that was built specifically for me. It has definitely gotten worse with age which makes me wonder if I'm just worn the frame out. I have a hard time believing this though as titanium is an aerospace grade material and I'm only 180 pounds BUT, I do ride really hard. I will also say this is less of a wobble then it is a high frequency vibration and it feels the factor of the vibration is vertical, up-and-down, not side to side.
Last edited by sirroada; 07-29-2017 at 11:53 AM. |
#7
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Headset worn or loose? You have checked the frame/fork for cracks, right? Loose fork dropout?
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#8
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Last edited by donevwil; 07-29-2017 at 01:06 PM. |
#9
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no reason not to believe you, but...
it is hard to believe anything about the frame is different...unless it is cracked somewhere. in other words, what could have changed to have the vibrating get worse?
my guess is you are missing a variable and maybe need a second objective opinion. find another 180 person and see if it vibrates for them. what could possibly be vibrating? inquiring minds want to know.
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Crust Malocchio, Turbo Creo Last edited by eddief; 07-29-2017 at 01:20 PM. |
#10
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Quote:
When you first called it "vibration" I took it to mean you're merely getting feedback from the road surface. If in fact it's wheel shimmy, then I've never heard of it feeling like it's coming from the rear of the bike. It's usually the front end that's shaking. If it's the rear end that's vibrating, then something unusual is going on. If it's the front end, it's front end shimmy and you need to check the usual suspects, starting with Ken's suggestions.
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#12
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This is so weird, never had the problem and never heard of the problem coming from the back of the bike and I had my quote of weird wheels that were never straight back in the day.
In a matter of fact I do have a wheelset with a rear tubbie that is not super duper and evethought I can feel the thumb thumb at low speeds once I reach like 12 mph the thing is gone. Do you have a picture of the bike in question? Just curiosity of the fit. |
#13
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To me it sounds like a small crack that has been growing over time.
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