Rear cassette upgrade
Hi,
I want to attend my first century which has a lot of hills. I have realized that my bike needs a upgrade to tackle the hills. I was wondering if I could upgrade my rear cassette to something like 13-27 or 13-31. (and what should I buy that fits this) Here are the info about my bike and the gear set:
bike: Specialized Epic 1994
All parts are campagnolo.
Rear cassette: 13-23
Front: 39-52
Thank you in advance