do I need frame bosses to fit this anti-chainsuck device?

Got one of those on my Rocky Mountain. They bolt on using the bridge between the chainstays. As long as you have a hole suitable to take the bolt it will fit. Needs a fair bit of faffing to set it up correctly but once sorted they work well.

Like this, hole all the way through the bridge.
2323551234_f485d1c2c1_z.jpg


I will dash out to the cave and take a piccy
 
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