That 12'' fin is too big. On my 10' heavy volan glassed noderider I have a 9.75" True Ames Heritage. It all depends on fin shape but I wouldn't go bigger than 10" and at 9'6 you could easily go with a 9.5" fin. As far as fin selection goes check out the Velzy Noserider, Farberow Flex, or KD Miss Lucy to name a couple.
The Greenough 4a, 9.75" is a solid noseriding fin. That's what I've been using on my Takayama noserider.
x2 on this fin.
I put it on my Bing Silver Spoon (when I had it). It was a noticeable improvement in surfing the board from the tail over the noserider fin (#1001) that the board came with. I can't speak to the noseriding capability.
The cool thing about fins (especially in a longboard) is the experimentation they allow. Your board calls for a 9.5" to 10" fin. That Greenough is a great start.
What size fin should be using on my longboard? Any good recommendations?
Last summer purchased my first longboard and the guy at the shop put a 12" fin. My previous board was '66 Hobie which had a glassed in 6-7" skeg.
as many have already said, the greenough 4A is my favorite longboard fin...i've used it in 2 totally different boards, a 9'2" robert august WIR, & my current log, a 9'6" wynn si si slider...used a 9" in the august & a 10" in the wynn. i LOVE that fin!! i've tried a couple other fins in my wynn & the 4A is the fin i keep coming back to.
FWIW, the reason your '66 hobie had such a small fin is b/c it was likely an old-skool "D" fin...lots of base, not a whole lot of foil, & a relatively low profile. most i've seen are around 8".
On my 10.0 nose rider I switch off between a 9.75 pivot and 10" hatchet. On my 9'6" LB I trade off between a 9" cut away and a 9.5 rake. I guess it depends on what you want to do that day. What type of board you have, rocker, nose & tail kick, etc all play into what type of fin will work best. And of course your style will also dictate what you use. Also, its hard to believe what a half inch or less of fin placement will do.
any thing from 10 inch to 11 would be fine. Depending on what you wanna do you fin choice is vast. Can get a 10.5 pivot fin or a greenough 4a. Fins that are Wider are best for noseriding cause the have alot of surface area to hold you in the wave when on the nose but are not as sesnitve to turing as a Long rake or cutaway fin would be. I you go to surfshop with a Future Fin Tree you can try a cpl diffent longboard fins that go in the standard fin box