Flap Steak vs Tri Tip — What's the Difference?
Quick Answer
Flap Steak (flap steak (sirloin flap)) and Tri Tip (tri-tip) are not the same cut: Flap Steak is sirloin primal (Bottom sirloin, obliquus internus abdominis muscle); Tri Tip is sirloin primal (Bottom sirloin, triangular muscle at the base of the sirloin near the flank).
Canonical entities: Flap Steak · Tri Tip
Side-by-side
| flap steak | tri tip | |
|---|---|---|
| Primal | sirloin | sirloin |
| Muscle / location | Bottom sirloin, obliquus internus abdominis muscle | Bottom sirloin, triangular muscle at the base of the sirloin near the flank |
| Character | A thin, coarse-grained steak from the bottom sirloin. The American name for what the French call bavette d'aloyau. Open grain absorbs marinades extremely well. Popular for fajitas, stir-fry, and carne asada. Often confused with skirt steak but from a different location entirely. | A triangular cut from the bottom sirloin (tensor fasciae latae muscle). Popularized by Santa Maria-style California BBQ. Lean with a pronounced grain that changes direction. Best grilled whole to medium-rare and sliced against the grain. |
Key differences
- Texture and slicing: compare fibrous, grain-heavy cuts vs more tender steak-style muscles based on each cut’s description.
- Retail naming diverges by country—always map through a canonical cut when translating menus or labels.
When to use each
Flap Steak
Pick Flap Steak when you want its specific marbling/texture profile: A thin, coarse-grained steak from the bottom sirloin. The American name for what the French call bavette d'aloyau. Open grain absorbs marinades extremely well. Popular for fajitas, stir-fry, and carne asada. Often confused with skirt steak but from a different location entirely.
Tri Tip
Pick Tri Tip when its primal/muscle traits fit the dish: A triangular cut from the bottom sirloin (tensor fasciae latae muscle). Popularized by Santa Maria-style California BBQ. Lean with a pronounced grain that changes direction. Best grilled whole to medium-rare and sliced against the grain.
Flap Steak and Tri Tip are different canonical muscles/primals: Flap Steak is sirloin (Bottom sirloin, obliquus internus abdominis muscle); Tri Tip is sirloin (Bottom sirloin, triangular muscle at the base of the sirloin near the flank).
Choose based on tenderness, marbling, grain direction, and how you plan to cook (sear vs braise vs slice thin).
Read the full guides: flap steak (what-is) · tri tip (what-is) · flap steak hub · tri tip hub