Te mortuo heres tibi sim?
Join Date: Aug 2004
Location: East coast
Bikes: hardtail, squishy, fixed roadie, fixed crosser
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The Blackspire stuff I've had has all been great, though I've not had a full chain-guide from them. If the little bit of extra weight of the Blackspire gives you a bit of peace-of-mind, go for it.
No help with the rest. Hell, I'm using a Truvativ Boxguide I picked up for $38 shipped on e-bay, with a Blackspire roller on the bottom vs. the stock number. Works great, and I've had no dropped chains with it on the Devinci.