If my rear spacing is 132.5mm...
My first thought is the frame may be bent. Use Sheldon's technique to check whether it's evenly bent. Look carefully at whether the dropouts are parallel to try and guess whether it's been bent in or out.
@moth started
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My first thought is the frame may be bent. Use Sheldon's technique to check whether it's evenly bent. Look carefully at whether the dropouts are parallel to try and guess whether it's been bent in or out.