Maintenance of the frame.
A steel frame can sometimes be straightened again.
For aluminum, it is irresponsible to bend them straight.
The chance that they then tear is too large.
Frames of carbon composites can not bend. If these get overloaded they break.
In aluminum frames, and frames made of carbon composite, it is also not possible to change the installation width of the hub.
It makes sense to expensive bikes with frames that have been involved in a crash, check for the presence of cracks in the paint and the frame material.
A frame that its crackings may break at that spot in the long run and can be replaced.
A frame that is severely deformed can be better replaced then straightened. Due to the deformations the strength of the material changes significantly. Also, the connection is no longer reliable.
This is especially true for pipes which are connected to lugs.
- Not good oriented wheels.
- Not readily mounted wheels.
- A bent fork.
- A poorly rotating head bearing.
- A not properly directed frame.