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THE OHM EQUALIZES THE WEIGHT DIFFERENCE BETWEEN CLIMBER & BELAYER
If there is a significant difference in weight between lead climber and belayer this frequently causes problems. This applies in particular to climbing couples, where the woman is often significantly lighter than her partner.
“For me, this provides the solution to weight problems in the rope team.” Angy Eiter (world’s first female 9b climber)
OHM
Assisted-braking resistor to increase rope friction when there is a large weight difference between belayer and lead climber. In the event of a fall, the OHM increases the amount of rope friction so that a lighter belayer can hold a heavier lead climber without difficulty.
- Far less holding force has to be applied in the event of a fall
- Lowering a heavier climber is much easier to control
- OHM is attached to the first anchor point in the safety chain
- In the event of a fall at the first anchor point, the OHM significantly reduces the risk of a possible ground fall
- Rope handling when belaying a lead climber is not affected (no additional friction when paying out rope)
- Recommended weight difference (lead climber > belayer): 10 - 40 kg
- Minimum weight belayer: 40 kg
- For single ropes with diameters of 8.4 - 11 mm
Fast & simple handling
No additional friction
Saves your "belationship"
Weight difference 10-40 kg
Over 150 years of EDELRID:
150 years of passion and enthusiasm for mountain sports, 150 years of ingenuity and pioneering innovations, 150 years of Made in Germany.
H. H.
2025-09-01 16:35:11
This thing is amazing!This has allowed my 12yr old daughter to safely catch big lead falls.. she weighs about 95lbs and I weigh 185lbs (2x her weight and 4x her age!). It is just a really excellent piece of gear that more teams should be using for safe belaying! My only gripe would be that it’s a little heavy- but that is really just a wish list item for a next generation of this piece, I’d never detract a star for that.. it just works so well, and since you leave it on the first bolt, it’s not really an issue while climbing (only in your pack)..love love love!
blender kitties
2025-08-01 13:16:05
This allows me, a climber of 220lbs to climb with my partner, 120lbs. It keeps us both safe by reducing me pulling her into the wall, and reduces the chance of me decking from a fall. It can be annoying to pull slack through sometimes, but well worth it for the added protection.
Jon and Lisa Davis
2025-07-10 13:36:46
We've been lead climbing for 4 years now and I'm about 35-40 pounds lighter than my climbing partner. If he fell at the first anchor there was the fear of decking and we've had a few painful mid-air collisions. Without the Ohm, I would be launched through the air and lowering him at the end of a climb meant my feet were often barely touching the ground. It was uncomfortable and nerve-wracking.Now that we have the Ohm, I'm never belaying a heavier lead climber without it. It arrived yesterday so we practiced intentional falls at the gym to get the feel for it. Even with a longer fall, I was barely lifted off the ground and lowering my partner at the end of the climb was comfortable and easy to control. I was able to lower him without my feet leaving the ground- it felt more like lowering off a top rope than a lead climb.Pros: No extra tension on the rope, feeding rope and taking rope felt exactly as it always does. The climber doesn't feel the device at all, it doesn't add extra heaviness when pulling rope. We both tried it and can attest that the climber doesn't even notice it's there. It's easy to place, but we recommend practicing a bit to ensure it's placed properly (a little practice really helps). It's really confidence inspiring for both of us- I feel more confident knowing I won't fly through the air and he feels more confident knowing it's safer for both of us when he falls.Things to consider: Practice with it. When my partner falls at the first anchor I am accustomed to pulling in the rope really firmly and quickly (taking in as much rope as possible); but with the Ohm this was a little too much tension for the climber.We haven't had the opportunity to try it outdoors yet but it seems like it would be very much the same experience.
Clem
2025-07-05 12:12:23
Packaging of item was damaged (not the outer envelope) and it appeared to be used and haphazardly put back together and taped. It was rattling around in a broken box and I returned it, and ordered another. If it had been marketed as a used item, I might understand the packaging, but it charged for a new item and it obviously wasn't.
Ross Potts
2025-06-30 17:59:48
What can I say? It’s an Ohm. It works. I’m a big-boy and sometimes I lead climb with folks I swear don’t understand physics until after they belay first without, and then with. this thing. I had been borrowing and borrowing from gyms for the last couple years and finally decided to pull the trigger on this purchase. Glad I did!
Dawn
2025-06-16 11:06:38
I bought this after a fall that left me 6 feet up in the air and my partner’s feet on the ground. Today I held 3 high fall factor falls with the same partner and didn’t even get a rough jerk. Worth the cost.
Mat
2025-05-18 17:27:39
I went through the fate of a few other reviewers and got a box that was clearly opened before, with a product that was clearly used before. I have no problem buying used climbing gear, as long as it's marketed and priced as such. At this point I'll probably just return this and buy the ohm 2nd generation (similar price).
Spencer Malone
2025-05-01 17:15:57
It's fairly heavy, which is both good and bad. I wouldn't take it outdoors very much. Definitely solves the safety problem of having a lighter belayer than climber, which is very appreciated. Makes me as a climber feel a lot better about the lower clips and bigger falls, but has some fallbacks that you need to watch out for.If you high clip as a climber, and then climb up to the clip, the slack reintroduced into the system can gather up around the Ohm, which can lead to there being an extra foot or two of slack that your belayer may not realize is there unless they look at the Ohm. My belayer has also complained that it can make lowering harder to control at times when using an assisted braking device. Both of those are certainly worth it for what the Ohm gives, in my mind. The first problem is easily solved once your belayer learns to watch out for it when high clipping, and then second problem seems to just take some adjusting.
Francisco Javier Ortega Garcia
2025-04-25 12:15:28
Pesa casi un kilo. Funciona muy bien con mi hija que pesa 35 kg menos que yo, recomiendo probarlo y aprender lo que da de sà en un rocodromo, algún dibujo del manual de instrucciones induce a error y la primera vez lo monté al revés. Por su modo de funcionamiento no empieza a actuar hasta que pasa de colgar de la chapa hasta subir por encima de ella... eso son casi 50 cm de cuerda... si el que te asegura te lleva muy corto de cuerda y pesa poco (que es para lo que sirve el cacharro) va a salir despedido hacia la pared.
Filippo
2025-04-19 17:55:33
Ottimo prodotto , prezzo un po’ alto ma ne vale assolutamente la pena … fa il suo lavoro in modo egregio davvero davvero affidabile
MartinT
2025-04-16 16:22:18
I was loaned one of these in France when a local took pity on my son, who was lashed to a tree so he could belay me safely. This brilliant device means a light climber can safely belay a heavy climber, either leading or seconding. You attach it to the first bolt and the rope runs freely until the climber at the business end loads the rope, when the ohm adds resistance to the system and your lightweight second stays on the floor, rather than being lifted to slam into the first runner. The ohm comes with the whole rig on the second photo; a maillon, quickdraw tap and krab. Excellent bit of kit for any climbing pairing with a big weight difference, but note that it can only be used on bolted routes or fixed indoor protection, NOT trad gear.
Kisscool
2025-03-06 13:46:52
Très bon assureur, il met très vite en confiance lorsqu'il y a une différence de poids.Le problème est lors de la descente, l'assureur se bloque très vite et la descente est alors fortement ralenti. Il faut bien rester dans l'axe de la corde pour que ça descende correctement
Katrin
2025-02-03 10:57:38
Da mein Kletterpartner ein ganzen Stück schwerer ist als ich, hebe ich trotz Zusatzgewicht ab wenn er im Vorstieg von der Wand fällt. Deshalb habe ich mir das Ohm gekauft und es gestern in der Halle getestet. Das Gerät ist gut verarbeitet und sehr einfach zu bedienen. Und es funktioniert wirklich hervorragend, auch ohne Zusatzgewicht hat es mich nicht angehoben, als mein Parter im Vorstieg ins Seil gefallen ist. Ich hatte einige Bedenken, dass für ihn das einhaken des Seils schwieriger werden könnte, aber das ist nicht der Fall. Tolles Gerät, dass hält was es verspricht.
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