• 126mm rear end flexes for 120mm fixed hub and when you open nuts it springs back to 126mm (can ofcourse deform towards 120mm in the long run). The permanent action is called "cold setting" but it is not needed in thes 3mm bendings. You would need it if the difference would be bigger. White eno eccentric hub is in 130mm widht (if I recall correctly) so it works well in 126mm rear end as well.

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