Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
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Any reason not to leave the outer ring in place as a "guard". It's probably no heavier than a replacement guard would be. Just set the fd's limit screws to prevent shifting into it.
Oterewise, just use the fd as a chain keeper and buy "single stack" chainring bolts.