“The 7.5″ works really well as a 2+1 set up in small and mid-range boards. I ride a 7’10”, and it holds in great with the FUTURES SB 1 (side bite fins). That setup handles anything up to six-foot Hawaiian, yet still gives you the signature snap out of turns that the Black Tip provides.
On my longer boards, I use the 8.5″ as a single fin (and also with side bites sometimes), and it makes your board extremely loose…
The key to this design is the tip flex inherent in the Black Tip. It has the carbon in the tip, then a gap, and then carbon again in the bottom two-thirds of the fin. What this does is give you extremely good tip flex, without the tip of the fin breaking down.
The fins are also light and thin because of the use of the carbon, so they are as high tech as anything on the market.”