I'm trying to install a new set of chainrings on my Schwinn Homegrown. It has a triple set of 58/94 BCD size, as best I can tell.
Using the crank puller, I was able to get the crank off and pull off the old chainrings. However, I am running into a problem. The old inner chainring (granny?) bolted into the middle chainring. The new middle chainring has no inner bolt circle. Therefore, there is no place to attach the inner chainring.
A book I have mentions that the granny ring should bolt directly into the crank arm (spider?) Does this mean that I have to buy a new crank arm?
So basically, I need some basic info on cranks/chainrings. Here are the questions I need answered:
1) Do crank arms come with and without an inner set of bolt holes?
2) How much do crank arms cost?
3) Am I missing something? Is there another way to attach the granny ring even though neither the middle chainring nor the spider has an inner bolt circle?
4) What should I do????
Thanks for all the help!