Save 10%

Edelrid Ohm

A clever and simple solution to the problems experienced by a light climbing partner belaying someone significantly heavier. For use at both climbing walls and outdoor sport climbing venues.



Edelrid Ohm Video


With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

You Pre-Order is prioritised (at no additional charge); meaning that, as soon as the product arrives with us, we can wrap it straight back up and get it sent out to you - it often never even hits the stock room shelves!


With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery Dates

Estimated Delivery Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery Dates provided on product pages.

The Current Estimated Delivery Dates for Edelrid Ohm is

Edelrid Ohm Description

  • Brand : Edelrid
  • Season :
  • Code : EDE OHM
  • Packaged Weight : 0.6KG
  • A clever and simple solution to the problems experienced by a light climbing partner belaying someone significantly heavier, which can lead to the heavier person decking it and/or the lighter person being whacked into the wall. Ohm = a unit of Resistance (Geddit!). 
    The Ohm is an assisted-braking resistor that you install at the first bolt as you climb past it. In the event of a fall, the Ohm increases rope friction so that a lighter belayer can hold a heavier partner with greater ease. The device does not stop the rope abruptly; instead it progressively brakes the speed it runs through, so that the belayer can still dynamically arrest the fall. The Ohm increases the amount of friction in the safety chain, independent of the belay device used. As a result, once the Ohm is activated, the belayer needs to apply significantly less hand braking force to the braking rope to arrest the fall and they wont be lifted off their feet and hurled against the crag. The OHM still enables smooth paying out and taking in rope when climbing and belaying and has no negative affect on handling.
    The Ohm benefits both climber and belayer: The belayer wont be pulled against the wall in an uncontrolled manner and the climber can climb right to their limits without having to worry that their belayer might not be able to hold them should they fall.
    For use at both climbing walls and outdoor sport climbing venues.
    The Ohm is suitable for ropes with a diameter between 8.6mm and 11 mm.

    Buyers Guide

    The German and Swiss Alpine Clubs (DAV, SAC) recommend that a climber should not weigh more than 1.33 times their belayer, i.e. maximum one third more (for example: belayer 60 kg/climber maximum weight 80 kg). In the event of a big fall, in particular at the climbing wall, such large differences in weight require extreme care and attention on the part of the belayer.

    However, including the Ohm into the safety chain increases this factor significantly and with this device, it is now possible for climbers in the lower weight ranges to belay a lead climber, who is up to 100% heavier than the belayer.

    Edelrid do not however officially recommend that climbers weighing less than 40kg use the Ohm as the chances are that this will encourage parents to get their children to belay them which could result in say a 70kg father going climbing with his 30kg son, ie over the x 2 weight ratio that the Ohm is designed for.

    However, if two youngsters were using it as an extra safety device then there should be no problem as long as they were competent belayers and being adequately supervised.

    NB It is not recommended to use the Ohm with a lighter lead climber and heavier belayer because the device will add extra friction into the system (as it is designed to do) and it will make the fall of the lead climber less dynamic. There is in any case no point in using it in these circumstances as the heavier belayer should have no problems holding the fall of a lighter leader.

    Sizing Information

    Technical Information

    Edelrid Ohm
    0 Customers Reviews this as 0
    • What do you think of Edelrid Ohm?
    • How would you rate it?
    • Would You Recomend this product?
      Yes: No:
    • Your Forename
    • Your Email
    • Submit Review