replacement 7 speed cassette for hybrid
I have a Univega via carisma hybrid bike. I bought it used recently and I am guessing it is mid-1990's. It has a triple crankset with shimano exage deraillers and 7 speeds in back. 700c wheels. A link on my chain broke and my bike mechanic explained if the new chain skips he will replace the cassette. He has a new replacement 12-28 7 speed shimano cassette. Hes prepared to put this in if needed. Im wondering if i will lose any easy gear with that replacement cassette, i dont know what the bike has now (its with the mechanic now.) Is there a 7 speed cassette with an easier gear i should consider. I know about the Shimano megarange but since i have a triple up front that doesnt seem like a good idea (34 is probably too big considering the triple up front?) I need to ride up steep hills, what cassette should i tell the mechanic to install if he has to put in a new one?