"...because I've fallen out with my front derailleur..."
I spent a couple of years not bothering with anything other than the middle ring on my old Sora triple crank spider on my LHT, mostly due to an inability for any front mech I bought which called itself a triple to have sufficient movement to reach both non-middle rings, so on my most recent annualish drivetrain replacement I stuck a chainguard on the outside, hoping to run things as a sort of 2*9, only to find that the latest front mech didn't even move in far enough. For some reason, in the past couple of months the inner ring has decided to become accessible, so I've been occasionally popping onto the inner ring instead of using the smallest sprocket, which keeps moving out of range. I'm also currently deliberately preventing myself from getting at the smallest sprocket until I resolve the cassette-lockring-loosening-itself issue, which joins forces with the stupid positioning of the rack and mudguard lugs in allowing the heads of bolts to be in just the right place to persuade the chain to jam between them and a 11-13-ish-toothed sprocket and which was possibly the cause of my elbow-ripping adventure on Easter Road earlier last year.
On this year's drivetrain replacement (imminent, following a chain incident the other week which I fear might have weakened it) I was going to stick a large chainring back on, keep the inner ring and re-mount the mudguard and rack with cut-down bolts.
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