Flank vs Sirloin Tip — What's the Difference?
Quick Answer
Flank (flank steak) and Sirloin Tip (sirloin tip (knuckle)) are not the same cut: Flank is flank primal (abdominal flank steak); Sirloin Tip is round primal (Front of the rear leg, between sirloin and round).
Canonical entities: Flank · Sirloin Tip
Side-by-side
| flank | sirloin tip | |
|---|---|---|
| Primal | flank | round |
| Muscle / location | abdominal flank steak | Front of the rear leg, between sirloin and round |
| Character | Long, fibrous abdominal cut; benefits from slicing across 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: flank 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
Flank
Pick Flank when you want its specific marbling/texture profile: Long, fibrous abdominal cut; benefits from slicing across 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.
Flank and Sirloin Tip are different canonical muscles/primals: Flank is flank (abdominal flank steak); 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: flank (what-is) · sirloin tip (what-is) · flank hub · sirloin tip hub