On Mega9, (rd-m962) i've heard that the spacing inbetween nobs on the cog is different than a standard 8 speed derailleur since it needs to accomodate a 9 speed chain. Is this correct?
Mtbr's 2016 Winter Biking GearReviews and Roundups
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Thread: XTR Mega9 and an 8 speed bike?