I just replaced my headset and wheel bearings from AllBallsRacing.com. The headset was dry on the neck bearing, and probably would have been fine with some grease and an adjustment. One of my wheel bearings was tight. My bike has 30k on it.
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Check steering head bearings,front/rear wheel alignment.Front wheel bearings.Do a wheel balance.How many miles on the tyre?
I had one that went away 5kph either side of 80kph.Fixed it[I think] with new tyre.At 100mph though???