i hardly ever use my small ring on my tt rig but i'm swapping cranks out and just realized the inner ring is 110 bcd. i don't exactly understand how the inner can use the same bolt and be smaller. any how if i were to buy a chainring kit is there a way to use a 130 inner instead or am i stuck with the 130/110 setup? i've never come across this before and i haven't taken them apart yet so i'm not real sure what's going on. thanks.