Originally Posted by
bikemig
TA outer ring is 50.4 bcd but it made different inners. The cylotourist inners are 80 bcd. I thought that the smallest inner was a 26. In any case if the bolt hole diameters all line up with your small chainring, then they are all 80 bcd chainrings. The other sizes of TA rings were 152 and 116 bcd.
I wish I had known this earlier - TA Cyclotouriste
How did my calucations go so wrong? I added a screen shot of the directions I followed to determine the BCD. Are these NOT TA rings?
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