Edelrid Ohm

Edelrid Ohm is a revolutionary device that allow belayers to remain safe whilst belaying leaders when they have a large difference in weight.

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.

The review of the Ohm on UKC is worth a read if you are interested in how it performs in the real world.


  • Belayer requires significantly less hand braking force to arrest a fall

  • Lowering a heavier climber is much easier to control

  • OHM is attached at the first bolt in the safety chain

  • Should a lead climber fall at the first bolt, the OHM significantly reduces the risk of a possible ground fall

  • Rope handling when belaying a lead climber 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 from 8.9 - 11.0 mm


  • Fmax. Vertical [Kn]: 15

  • Approved rope diameter [mm]: 8,9 - 11

  • CE marking: CE 0123

  • country of origin: Germany

  • Weight: 470 g