FCS1 or Futures: which base do I need?
Every Butterknives fin comes on one of two bases. Which one you need depends on the fin boxes in your board, not on the fin.
Look at the fin boxes in your board
- Two small plugs per fin, round or oval, each with a small screw: that is FCS1. You need the dual tab base.
- One long, narrow box per fin, with one screw: that is Futures. You need the single tab base.
Dual tab base for FCS1
The fin has two tabs that slide into the two plugs and are held by the screws. See all FCS1 fins.
Single tab base for Futures
The fin has one long base that slides into the box and is held by one screw. See all Futures fins.
Do FCS1 fins fit an FCS II box?
No. FCS II is keyless (the fin clicks in without screws) and takes a different base: an FCS1 fin does not fit an FCS II box. Butterknives for FCS II are not available yet: join Buttermag to hear when they are.
Which size are Butterknives?
Butterknives come in one size, the same for all three positions: 122.3 mm high (4.8 in) and 117.1 mm wide (4.6 in), with a honeycomb core and a medium flex. To compare, measure the fins you ride now from the base to the tip.
Mix the designs, not the bases
The three fins of a thruster setup all need the same base, but you can pick a different design for each. Build your set in Pick your poison: any three fins for €79, with a free Butterwax. Lose one later? A replacement fin is €30.
Still not sure?
Send us a photo of your fin boxes through the contact page and we will tell you which base fits.
