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@Psychobikin
nothing in a 73 shell unfortunately - here;s my thinking along those lines though...
a sugion RD needs a 103 JIS spindle for 42mm chainline
so... i need to increase the chainline by 12mm which means increasing the spindle length by 24mm - voila - 127mm spindle... sound sensible?
I think i'll just order them then work from there with spacers etc - i've got both chainring spacers (decrease chainline) and bolt on cog spacers (increase chainline) so we'll see. Are the spindles in a un54 interchangeable?