Just bought a new Lefty Kreh professional 9wt. I was wondering what line, you would recommend 9 or 10wt. ?

I haven't cast the 9 wt, but most of the Pro series rods cast well with both their rated line and uplined one size. I've also seen a lot folks use the 1/2 wt heavier lines, such as SA's GPX line, with the Pro rods. With these rods, deciding to upline or not really seems to be personal preference decision that can go either way.

If you can make it to Fly Fish Texas tomorrow, you can go by the TFO booth and try casting their 9wt demo rod with several different lines.

Thanks, I appreciate your input.

if you don't mind me asking, why the 9 weight?

I bought this rod to fish big poppers and big bugs for big bass.
Jim Kern, who I got the rod from, made the decision to go with a 9 over an 8 wt.

can't get much better advice than from jim kern. great guy. if you are targeting large bass, thats the way to go. Orvis has a big bug line that i love. could toss a brick with it. works great on those windy days

with that rod, do not overweight it. it feels seriously mushy. My father has an 8wt that i tested with my 9wt line and it was aweful.

Rex had one, a nine, that came out to Fly Fish TX with the TFO crew. We both cast it with a 10 and then a 9 wt line.
With the 10 it felt quite limited; couldn't carry much line at all. That being said, it would load up thirty feet and then shoot the-entire-line. With the 9 wt line it was more like a regular fly rod.
That's what I perceived. My opinion, if you're gonna be tossing big old poppers in close, the 10 wt line would be great. Other than that, for all around fishing, I say go with the 9.

Rex will be on here later with his take.

Robin summed it up real well. I agree, I liked the 9 wt line better than the 10 wt line on the 9 wt TFO Pro II.

It is worth noting that the 9 wt and 10 wt lines were not the same type of line or even the same tapers. So, it was not an apples to apples comparison.

10 wt line had a short, heavy head on it which explains why you could shoot the line so well, but it was more difficult to carry a lot of line in the air. After we finished casting, I found out that was probably a tarpon taper line. The 9 wt line was a shark skin line and was a fairly typical weight forward taper. This line seemed like a good match for that rod.

Good luck!

Rex

I fish mine with 9 # lines--warm water, I fish Tropical Clouser, cold water, I fish Coldwater Clouser, and sinking line on my spare spool is Orvis Depth Charge 400, and the rod performs excellently, but rigged properly, I think all TFO rods fish excellently!