Climbing Grades: The Complete Guide - 99Boulders
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The Difficulty of Grading in Climbing - YouTube
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AustralianBouldering.com
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Grade Conversion, very useful! : r/climbing
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Bouldering Grades: The Complete Guide - 99Boulders
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Routesetting — The Spot Climbing Gym
Rock climbing grades and conversions. The 5 most used systems.
South Africa rock climbing grade conversion table
