Back-clipping and z-clipping are two lead-clipping errors. Back-clipping threads the rope through a quickdraw the wrong way, so it can unclip in a fall; z-clipping pulls rope from below the previous draw to clip the next, creating huge drag. Both are fixable and avoidable with good clipping habits.
| Aspect | Back-Clipping | Z-Clipping |
|---|---|---|
| The error | Rope clipped the wrong way | Rope grabbed from below last draw |
| Main risk | Rope can unclip in a fall | Severe drag, little protection |
| Visual cue | Rope over the gate side | A 'Z' in the rope |
| The fix | Re-clip rope to the front | Unclip and clip the correct strand |
| When it happens | Any clip | Bolts close together |
It's back-clipping when…
- The rope runs up against the gate side
- The carabiner can lever open in a fall
- You clipped the strand the wrong way
It's z-clipping when…
- You grabbed rope from below the last draw
- The rope makes a Z shape
- Drag suddenly becomes severe
Verdict
Frequently asked questions
What's the difference between back-clipping and z-clipping?
Back-clipping is clipping the rope through a quickdraw so it runs against the gate and can unclip in a fall; z-clipping is pulling rope from below your previous draw to clip the next, creating a Z that causes severe drag and poor protection.
Why is back-clipping dangerous?
In a fall on a back-clipped draw, the rope can press the carabiner gate open and unclip itself, removing that protection at the worst moment. Correctly clipped, the rope runs over the front so it can't lever the gate.
How do you avoid z-clipping?
Always clip the rope coming directly up from your tie-in, tracing it with your eyes or hand when bolts are close together. If you've z-clipped, unclip the offending draw and re-clip the correct strand.
Related: Back-Clipping · Z-Clipping · Quickdraw · Lead climbing