Shimano released a new Trail infused XTR derailleur with a feature called Shadow Plus that offers better control against chain movement in rough terrain. The Shadow Plus XTR rear derailleur offers a mode switch for users aimed at controlling the chain better in rough terrain with a friction stabilizer.
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For more information on the 2012 Shimano XTR Shadow+ rear derailleur, check out our previous article. You can also check out reviews of the Shimano XTR group as well as the part weights.