Plenty of fly fiishermen will argue about the wt of a rod. Here is the straight decoded poop: light wind and small flies = light rod. For redfish, it seems like I am always casting in the wind. If it is windy, you want a 9 wt. You will not be able to distinguish between a 9 wt and an 8 wt when fighting a fish. You will be using 12 lb tippet (mine is 40#, 20#, 12#, 3' of each shortened slightly by the knots). Your flies will be a chartreuse clouser, a small copper popper, a slider, or a spoonfly. Only the clouser casts worth a darn. Believe me, you will need a 9 wt to stop cursing so hard at the wind. If you have no wind, you can get by with a 6 wt or smaller, but you are restricted to clousers or even smaller flies. Seasoned anglers know that redfish pull harder on conventional tackle than fly, so the wt of the rod (within reason) just doesn't matter much. I loaned my rod to a friend the other day and hastily grabbed my other reel for a 6 wt. I didn't realize that it was set up for rainbow trout until I was already on the flat. NO BACKING! Ended up with over 20 black drum up to 18" and never saw the spool.