You can try a 38T ring but frankly it sounds like your best bet is a triple. Clearly more expensive (you'll need the crank, probably a new FD, possibly a new RD and possibly shifters unless you have downtube shifters.)
Originally Posted by
quadripper
I guess switching to a 12T/32T 7-speed cassette would make a bigger difference?
Is it pretty easy to replace the Cassette?
Replacing the cassette is easy, but with a 14-28 make sure it's not a freewheel first.