Join Date: Jun 2011
Location: Sunnyvale, California
Bikes: Bridgestone RB-1, 600, T700, MB-6 w/ Dirt Drops, MB-Zip, Bianchi Limited, Nashbar Hounder
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I'm not sure if you understood the significance of HillRider's comments. This inside-chain-guard needs clearance between the crankset and the right chainstay. On most bikes, they already have major clearance issues and chain alignment challenges on the frame so they add a recess on the drive side of the right chainstay for the crank to clear, and they add another one just an inch further back on the inside for the tire mud-room. I've broken 2 frames right in this area because the deformation focuses stress here. So if there was enough clearance for an inside chain guard, it's unlikely you have proper chain alignment, unless you're using a 2-ring compact mtb crank. But clearance might still be an issue then for any ring over a certain tooth size (e.g. 28t). This is aggravated by composite and aluminum frames that require thicker walls and larger diameters to equal the strength of equivalent steel in older frames.