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Slight bobbing during highway speeds.

mroussetos

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Does anyone know why you would get SLIGHT bobbing coming from the front suspension during highway speeds? Going approx. 80-100kph What do I need to get looked at? Would that be a untrue rim?

Thank you.
 
1st, inspect the tire. Is the tread worn unevenly? Are there cracks in the sidewall? Either one indicates the tire needs replaced.

Is the wheel/tire assembly balanced properly? Just like a car, they must be properly balanced and often need rebalanced during the life of the tire. Proper air pressure is important too, too much (or an old hard tire) and the tire will transmit too much road info. (bumps)

Do you have a spoke or mag wheel? Spokes come loose and need maintenance like anything else. Take a small box wrench, 10 or 12 mm and tap each spoke in the middle. They should all make a high pitch 'ting' sound that is nearly the same pitch for each spoke. If any make a dull thud sound, then they are loose and the wheel will probably need retrued.

That's the most likely suspect, the tire and/or wheel. You could get odd movement from loose headset bearings, worn out forks, or a bent frame too.
 
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