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Maybe, I can't remember whether the 127mm UN55 is symmetric. If it isn't, you've probably gone too far 🙂
I’ve been looking at the UN55 BB data online and although I can’t find anything for a 127, I have for a 122mm.
Stated length 122mm
Actual length 123.2mm
Right hand stick out 28.6mm
Left hand stick out 26.6mmThis should give me a 51.2mm chainline and with a 1mm spacer on the drive side a 52.2mm. 0.3mm out but I think I can deal with that.
bjf
gbj_tester
Maybe, I can't remember whether the 127mm UN55 is symmetric. If it isn't, you've probably gone too far 🙂