Originally Posted by
Tourist in MSN
You are comparing 4 and 5 arm cranks with different bolt circle diameters. If you might want a lower granny gear some day, think about how low you might want to go. Some cranks will only allow a 24t (or bigger), but some other cranks will allow chainrings smaller than 24t.
The way I calculated it if I have an 11-34 rd I can go with a 26t and should be fine... As I understand it a 130 triple supports a 74bcd for the inner ring.... The 110bcd doesn't seem to be a triple popular format with only a few exceptions... Mtb seems to be 104/64bcd for triples....