What is the skinniest rope you have seen someone lead on.

Single line rope. Just curious.

10m with no gear placed

I've simulclimbed the 1st flatiron on an 8.4mm before. Does that count?

I lead ice from time to time on a 8.6 mm half rope. No big deal if you don't fall.

I saw some guys climbing Bear's Reach at Lover's Leap on 7mm Bluewater Accessory cord...yep.

I did Bear Creek Spire on a single 8mm this summer. I wasn't worried about it being strong enough, rather, I was more worried if the belay device would work if I took a true whip.

My twins are Metolius 7.7mm lines. On several occasions I've climbed on only one of them.

A buddy of mine got his ropes stuck on rappel in Red Rocks and had to lead back up on his 6mm accessory pull cord so he could free his rope.

8.5mm half rope on a sport climb. My partner and I got my rope stuck on Cloud Tower and my partner lead back up on my 6mm tag line.

Wolfs head ridge route on a single 8.5mm half rope. Moderate climbing with low fall potential. I am sure a single strand of half rope would hold me on a lead fall but I'm thinking it would have stretched a lot longer than with two strands or a true single rope which then means more likely to ledge fall on something

A single Petzl Dragon Fly 8.2.

7.7mm

0.0, but that guy really ran it out.

"No big deal if you don't fall."

Indeed, so why bother? ;^)

I believe MacGyver once scaled a large skyscraper with dental floss.

Jon H wrote: ...ropes stuck on rappel in Red Rocks...

This would be more interesting if it was "what's the skinniest rope you've ever seen someone fall on."

Bryan Hall wrote:This would be more interesting if it was "what's the skinniest rope you've ever seen someone fall on."

Climbed Blues Riff in Tuolumne on my 8.1.

I believe Chris Sharma red pointed Just Do It on a custom cut BW 8.6mm, which at the time was quite thin, maybe not so much anymore.

On easy alpine rock 8mm. Wasn't worried about it at all, but belayer should be set up for high friction (see other threads on that topic).

I led Wide Country (5.11) on an 8mm. Didn't fall, didn't want to.