i had the same prob. age making the hills steeper & longer( also limeted well stretched budget) i had a 13-21 freewheel to a 52-42 chainwheel set. a 39 chainwheel nz$70 ,not the answer. my solution was a new freewheel cluster 14-28 & a new chain nz$50. it made a massive differance, i now ride some of my old curcuits id been avoiding for a while with comparative ease
