Why are my bike handlebars loose?

Why are my handlebars wobble?

Tyres are usually the main culprit with wobbles, then as has been said wheel bearings, steering head bearings (worn or too loose) also mis-aligned forks, fork oil levels not the same in both forks and another one though less common is worn swingarm bushes/bearings, any way regardless should be no wobbles so find and …

How tight should handlebars be?

meow meow. for aluminum just get it tight enough so its not going anywhere.

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