Question about Trek 69er Single Speed
It's the rear derailleur's job to take up or provide the proper chain tension as you shift to different gear combinations. It has limits.
It may not be malfunctioning.
Using the large front chainring and the largets cog in the back can pull up too much chain; using the smallest chainring in the front and the smallest cogs in the back can let out more chain than it can control.
The 'extreme' opposite combinations are mechanically unsound and unnecessary to use as there are other combinations of rings and cogs that will yield the same mechanical advantages while keeping the chainline straighter, tighter and not stressing the chain sideways.
Google "how to shift gears on a bike" for vids and textsplanations.
If there is a mechanical issue, see this...
Posted on Mar 28, 2011
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Posted on Jan 02, 2017
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