Updated Grade converter - 8a.nu News (Polska)
Rock climbing grades and conversions. Read more about the difficulties.
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The new grade conversion table - 8a.nu News
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Grade Conversions – Rockfax
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How do you compare between different rock climbing grades? - The Great Outdoors Stack Exchange
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Do font grades (6C+, 7a, etc.) in bouldering correspond to the same difficulty in sport climbing? - Quora
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Grade Comparison Chart - Alpinist.com
Norwegian grading scale | theCrag
Norwegian grading scale | theCrag
Ari's Base Camp: Grading/Rock
Grade Conversions – Rockfax
South Africa rock climbing grade conversion table
