Balancing Rods and Lines

I've been wondering why it is so hard to find lines that balance rods perfectly. What are your thoughts on this? If they made lines in half-weight increments, would that help?

Q: I've been wondering why it is so hard to find lines that balance rods perfectly. What are your thoughts on this? If they made lines in half-weight increments, would that help?

Ed Rapeseed
Leesburg, Florida

A: Every fly rod I have cast in the past few years could easily handle three line sizes (one lighter and one heavier than the recommended size). I believe the length of line being false-cast and the type of fly the line transports vary so much that a perfectly tuned rod would only be so at a specific casting distance and with flies of particular weight and air resistance.