I want wider tires on an old raleigh technium. It has been upgraded previously it has a shimano 7 speed 105 system The tires are 23mm and I want 28 or larger to make this bike my commuting in the rain bike. My questions are, Do ineed new brakes it has dual pivot 105 brakes can I make them wide enough. My shifter (sti) for the front is shot. A lbs tried replacing the cable but confirmed it was shot. Should I try to find a replacement or I have thought of going with bar ends. Any cheap ways to make the ride smoother? Thanks for any input