So what is the difference?

[Thudpucker]

[]HAH! You know Real Engineers dont Guess at anything!

Now then, hackers like me...

Dont have the foggyiest idea.
I cant imagine taking the time to work out the stress differences between a fish caught on a 4 and a fish caught on a 5.

I wonder if it's offset weights?
Heavier Reel for the 5 to offset the weight of the line hanging on the end of the rod?
"Ah'own know"
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