Inside Skirt vs Tri Tip — What's the Difference?
Quick Answer
Inside Skirt (inside skirt steak) and Tri Tip (tri-tip) are not the same cut: Inside Skirt is plate primal (Transversus abdominis muscle — the inner diaphragm muscle); Tri Tip is sirloin primal (Bottom sirloin, triangular muscle at the base of the sirloin near the flank).
Canonical entities: Inside Skirt · Tri Tip
Side-by-side
| inside skirt | tri tip | |
|---|---|---|
| Primal | plate | sirloin |
| Muscle / location | Transversus abdominis muscle — the inner diaphragm muscle | Bottom sirloin, triangular muscle at the base of the sirloin near the flank |
| Character | The 'other' skirt steak. Thinner, wider, and slightly tougher than the outside skirt (which is the standard 'skirt steak'). Most restaurant fajitas use inside skirt because the outside skirt is exported or sold at premium. Requires high heat, fast cooking, and slicing against the grain. | 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
- Different primals: plate vs sirloin.
- 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
Inside Skirt
Pick Inside Skirt when you want its specific marbling/texture profile: The 'other' skirt steak. Thinner, wider, and slightly tougher than the outside skirt (which is the standard 'skirt steak'). Most restaurant fajitas use inside skirt because the outside skirt is exported or sold at premium. Requires high heat, fast cooking, and slicing against the grain.
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.
Inside Skirt and Tri Tip are different canonical muscles/primals: Inside Skirt is plate (Transversus abdominis muscle — the inner diaphragm 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: inside skirt (what-is) · tri tip (what-is) · inside skirt hub · tri tip hub