Inside Skirt vs Sirloin Tip — What's the Difference?
Quick Answer
Inside Skirt (inside skirt steak) and Sirloin Tip (sirloin tip (knuckle)) are not the same cut: Inside Skirt is plate primal (Transversus abdominis muscle — the inner diaphragm muscle); Sirloin Tip is round primal (Front of the rear leg, between sirloin and round).
Canonical entities: Inside Skirt · Sirloin Tip
Side-by-side
| inside skirt | sirloin tip | |
|---|---|---|
| Primal | plate | round |
| Muscle / location | Transversus abdominis muscle — the inner diaphragm muscle | Front of the rear leg, between sirloin and round |
| 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. | Also called the knuckle. A lean, moderately tender cut from the front of the round, near the sirloin. Used for roasts, kabobs, and stir-fry. Not from the sirloin despite the name. |
Key differences
- Different primals: plate vs round.
- 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.
Sirloin Tip
Pick Sirloin Tip when its primal/muscle traits fit the dish: Also called the knuckle. A lean, moderately tender cut from the front of the round, near the sirloin. Used for roasts, kabobs, and stir-fry. Not from the sirloin despite the name.
Inside Skirt and Sirloin Tip are different canonical muscles/primals: Inside Skirt is plate (Transversus abdominis muscle — the inner diaphragm muscle); Sirloin Tip is round (Front of the rear leg, between sirloin and round).
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) · sirloin tip (what-is) · inside skirt hub · sirloin tip hub