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Rock climbing rope
Rock climbing rope is available in many lengths and diameters. 50 meters has long been the standard length for most ropes, but recently many climbers are opting for longer ropes, up to 70 meters. Rope diameter ranges from 7.5mm to 11 mm. Generally, thicker ropes are stronger, but they are also heavier.
The strength of a rock climbing rope is measured via static elongation and maximum impact force (MIF). Static elongation is determined by the amount a rope stretches when weighted with a standard load (176 lbs.). MIF is the measure of the amount of force absorbed by the rope during a fall. A low MIF means that the rope, rather than the climber, takes on more of the energy created by the fall. A rock climbing rope is considered semi-static or dynamic based upon these two variables.
Rock climbing rope is available in three major varieties, outlined below:
• Single ropes are the most common and are suitable for most conditions. They are easy to handle, but can only be used up to half rope length heights.
• Twin ropes are clipped together and must be used in pairs. Because of redundancy, safety is greatly increased with twin ropes.
• Half ropes are in between single and twin ropes with regard to strength and weight. It is recommended that they be used in pairs, like twin ropes
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