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older kysrium vibration

Old 11-05-18, 05:19 PM
  #1  
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older kysrium vibration

hi , i bought a used pair of ksyrium wheels with conti gp4ks2's , they work great except i feel a full bike vibration, even in the brake levers , when up around 25 mph , would anyone know what could be causing this , they are the older style wheels with the special spoke knobs you need a special tool to adjust ..
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Old 11-05-18, 06:10 PM
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You dont mention if the wheels are true.Do they spin straight? If so then the virbration could be an indication that the freehub is worn. I haven’t seen a full bike vibration described, but Mavic freehubs use a nylon bushing that wears out. The most commom symptom is a squealing and vibration wheen freewheeling at high speed. While you dont mention any noise, that you are experiencing the issue at speed makes me suspect the bushing. The bushing can be replaced, but when I have had the problem, I just went ahead and replaced the whole freehub body (they cost $50-$70). You could also try the no cost option, before replacing anything, take the freehub apart, clean the internals and lube the bushing.

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Old 11-05-18, 06:46 PM
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Having only the valve stem hole to seal, I wonder if someone tried to run them tubeless and there is dried up sealer in the tires. Were the tires mounted when you bought them?
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Old 11-05-18, 07:06 PM
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What gear are you in? Cog/ring combo? Andy
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Old 11-05-18, 11:10 PM
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Pedaling/ coasting?
First thing to check is tires- flat spots, not seated fully, etc..
Unlikely, but water inside the rim can happen.
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Old 11-06-18, 01:22 AM
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no squeal , the wheels are true as can be , but i could take them to the shop and have them measure them , i doubt they where run tubeless , i notice the vibration peddling or coasting but usually at speeds of 25 mph and over , and the guy did give me a bottle of shimano lube and the tool to undue the hub .thanks
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Old 11-06-18, 01:38 AM
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Someone sorta implied this, but the wheel could be imbalanced for some reason. Try putting your bike upside down and see if one side of the wheel always ends up at the bottom. If it's really eager to end up with this side down, then you have an issue. For your rear wheel, try turning your bike upside down then spinning up the wheel really fast. The wheel shouldn't "bounce".

Also, take off the wheels and check the bearings by hand. Are they smooth and tight? There shouldn't be any play.
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Old 11-06-18, 07:46 PM
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The first thing I thought of is the chain/cog meshing when the small cogs are in use. The speed matches this possibility. Andy
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Old 11-06-18, 10:51 PM
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Originally Posted by DOS View Post
You dont mention if the wheels are true.Do they spin straight? If so then the virbration could be an indication that the freehub is worn. I haven’t seen a full bike vibration described, but Mavic freehubs use a nylon bushing that wears out. The most commom symptom is a squealing and vibration wheen freewheeling at high speed. While you dont mention any noise, that you are experiencing the issue at speed makes me suspect the bushing. The bushing can be replaced, but when I have had the problem, I just went ahead and replaced the whole freehub body (they cost $50-$70). You could also try the no cost option, before replacing anything, take the freehub apart, clean the internals and lube the bushing.
This is worth checking because it is a common issue with Mavic freehubs. Checking is easy and free.

Take the wheel off and grab the cassette. Try to move it inboard and outboard, as if you were putting it on or taking it off. If there is play then the nylon bushing is worn.

https://roguemechanic.typepad.com/ro...es_a_mavi.html


-Tim-

Last edited by TimothyH; 11-06-18 at 10:57 PM.
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Old 11-07-18, 09:52 PM
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I spin the cranks by hand got the wheel going as fast as possible and it hops a bit and vibrates , doesnt hop enough to move or jump around though .
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Old 11-07-18, 10:09 PM
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Originally Posted by Teamprovicycle View Post
I spin the cranks by hand got the wheel going as fast as possible and it hops a bit and vibrates , doesnt hop enough to move or jump around though .
More data is good. Try doing this same test without the tire and tube mounted, just in case they're the issue. Mavic uses a plug of Al at the rim's seam (and this can clack about if it come loose) and this plug can cause an in balance. Another investigative trick is to add weight at points around the rim (like the valve point first) to see if the spin smoothens out. If so then the problem is weight placement within the rim. Andy
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Old 11-07-18, 10:17 PM
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Originally Posted by Teamprovicycle View Post
I spin the cranks by hand got the wheel going as fast as possible and it hops a bit and vibrates , doesnt hop enough to move or jump around though .
That's probably enough to feel. Do you have access to a friend's wheels? Try swapping the rear only and see if the problem persists. It could be that you're rear wheel is significantly out of round (egg shaped).
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Old 11-08-18, 02:58 PM
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In 2010 a customer had this exact same problem. We switched the rear wheel out, and it did not change. When the front wheel was switched out the vibration went away. Sent the front wheel back to Mavic (it was a new wheel purchase) and got a replacement. No way of telling which wheel is the origin of the problem until you eliminate one of them and see the result.
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Old 11-09-18, 03:50 PM
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overhaul and or replace freehub
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