I'm doing 3 centuries this year on this bike:



But, a question...2 of the centuries are local, and well supported, so I won't have to carry much that won't fit in a seat pack...but the 3rd makes major changes in elevation, and temperatures can vary a lot....how do I carry the extra gear if my bike doesn't take a rack? I don't want to wear a backpack - should I get a seat post rack for the ride?