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@jonnym
Good explaination in this article. http://www.bicycling.com/mountainbikecom/bikes-gear/tested-shimano-xtr-shadow-plus-rear-derailleur
Wondered if anyone used one at Roubais last week?
It essentially reduces/"damps" the forward rotation of the derailleur arm, keep chain tensioned. And its switchable for removing the wheel. Clever!
Unfortunately it doesn't automatically double de-clutch and blip the power on downshifts ! Maybe 2015 version?
Jonny