The Fin
Side Bite 4.0 - FCS Compatible, Hexcore (2 Fin Set). A versatile 4.0" side-bite template designed to complement a center fin in 2+1 setups, adding drive, hold, and responsiveness without feeling sticky. The flat inside foil and moderate outline offer a balanced blend of stability and release that works across a wide variety of boards and conditions. Hexcore construction reduces weight and increases responsiveness while preserving the positive, connected feel of a solid glass fin.
Specifications
More height and base mean more of the fin engages when the board is on rail, and the foil delivers noticeably more hold and release than the smaller sizes carry.
Run these on a performance log or big board in steep, overhead surf where you want maximum rail authority and a driving, aggressive 2+1 feel. If you mostly surf clean, small waves or want the single-fin character left mostly intact, drop to the 3.7 or 3.25 instead.
The True Ames Side Bite 4.0 is a 4.0 inch side bite pair in FCS-compatible Hexcore construction, sold as a pair, one of the larger sizes in the range behind only the 4.35. Hexcore construction is lighter than solid fiberglass while keeping the template's stiffness. The pair is intended for 2+1 setups on longboards and bigger boards, paired with a center fin sized down to around 6.5 to 7 inches.
Mentioned in the review — Side Bite 3.7 · Side Bite 3.25 — not something we carry.