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Grigri plus and oplux

N

Newhunter1

Well-Known Member
SH Member
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Dec 20, 2018
Messages
1,791
I have both the grigri + and the mad rock safeguard for me and my son's climbing system. I also have predator rope that I will use for SRT so I'm not going to sell the grigri +...my problem that I have found is that when I stand up using the grigri + that it slips down and introduces slack in my system. I'm probably going to go back to the mad rock for the time being and only put my grigri for SRT. My question is this...how do you keep the grigri from sliding down the rope. I'm using oplux but I do have sterling HRT 9mm that I could use, but don't want to as it is not as compact as the Oplux.
 
I’m not 100% but I’m fairly sure that neither device is rated for oplux


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When you say you stand up, you are introducing slack. It cant automatically move up the rope just because you stand up.
 
And both the Oplux and Predator are outside of Petzl's specs for rope:

  • Weight: 200 g
  • Rope compatibility: 8.5 to 11 mm single rope
  • Material(s): aluminum side plates, stainless steel friction plate, cam and wear plate, reinforced nylon handle
  • Certification(s): CE EN 15151-1, UIAA
 
SNIPERBBB said:
When you say you stand up, you are introducing slack. It cant automatically move up the rope just because you stand up.
Click to expand...

It slides down the rope as I take pressure off. The mad rock did not do that. I was simply asking if there was a way to safely use the grigri + with oplux as I know that others have used it with success.
 
Newhunter1 said:
It slides down the rope as I take pressure off. The mad rock did not do that. I was simply asking if there was a way to safely use the grigri + with oplux as I know that others have used it with success.
Click to expand...

Did you try switching it to top rope mode? Lemme know how that works.


Semper Fi,
Mike
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I am pretty sure the gri gri is designed to do that. The caming action only activates on sliding rope. In a rock climbing situation, the belayer is ideally engaged at all times and brakes a falling climber. But in an unfortunate event they get knocked out from falling rock or off of their perch with a falling climber, the Gri gri is there to backup the belayer. This at least what I have been taught from my rock climbing days. For the application that saddle hunters use i would recommend avoiding the gri gri, unless you put a prusik ABOVE the device.

Food for thought, stay safe!!!
 
If you want it to not slide down, tie a slip knot as I show here.
 
Jabronie678 said:
I am pretty sure the gri gri is designed to do that. The caming action only activates on sliding rope. In a rock climbing situation, the belayer is ideally engaged at all times and brakes a falling climber. But in an unfortunate event they get knocked out from falling rock or off of their perch with a falling climber, the Gri gri is there to backup the belayer. This at least what I have been taught from my rock climbing days. For the application that saddle hunters use i would recommend avoiding the gri gri, unless you put a prusik ABOVE the device.

Food for thought, stay safe!!!
Click to expand...

The Grigri + has a selector knob that reduces spring tension. You can select lead belay or top rope mode. It works differently than the other 3 models of the Grigri.


Semper Fi,
Mike
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I think the problem people are having with Oplux and the GriGri is, it is way below the minimum spec and slides easily. On thicker rope it won't slide as much.
 
bj139 said:
I think the problem people are having with Oplux and the GriGri is, it is way below the minimum spec and slides easily. On thicker rope it won't slide as much.
Click to expand...

Very likely. I keep my bridge very short when ascending, so it’s not an issue. I’m using 9mm HTP at present. Planning to order some Oplux this weekend. I can actually stuff 40’ of HTP, my Grigri+, and paracord retrieval line in the Latitude Dump pouch. And when I say “stuff”, I mean stuff. I think the Oplux will be a little easier to pack. Maybe I should just get off my butt and sew one of those cool looking rope pouches ...


Semper Fi,
Mike
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ShooterMike said:
Very likely. I keep my bridge very short when ascending, so it’s not an issue. I’m using 9mm HTP at present. Planning to order some Oplux this weekend. I can actually stuff 40’ of HTP, my Grigri+, and paracord retrieval line in the Latitude Dump pouch. And when I say “stuff”, I mean stuff. I think the Oplux will be a little easier to pack. Maybe I should just get off my butt and sew one of those cool looking rope pouches ...


Semper Fi,
Mike
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Click to expand...
Did you see the post about how much strength Oplux loses in a figure 8 loop? Nylon rope retained about 90% while Oplux was about 45%.
 
bj139 said:
Did you see the post about how much strength Oplux loses in a figure 8 loop? Nylon rope retained about 90% while Oplux was about 45%.
Click to expand...

I did not .... or should I say “I did ‘knot’ ... “

But that’s very interesting. While losing 55% is tremendous, the MBS for Oplux is listed at 5440, so 45% of that is what ... 2440? Assuming a 10% working load, 240lbs. I’m weighing in at 153lbs out of the shower, so I’d guess 170 in the tree. Cutting it close, but ... enough margin for me.

I could be mistaken, but isn’t 10% of the MBS the working load of a rope?


Semper Fi,
Mike
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