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Table: Tranx

ChainSlack (Difference in number of teeth between the Largest on the front and rear, and smallest on front and rear. Eg: A 48/38/28 chainring and 11-32 cog requires a deraileur capacity of 21+20=41 teeth.

Any given derailleur has a capacity to take up a certain number of teeth of chain slack. Eg: 45 teeth