• I'll still need a chain guide to stop it dropping

    Not really, unless you're going to do actual mountain biking. Still, a fixed chain guide is a lot less maintenance, expense and weight than a front dérailleur, a couple of chainrings, a LH shifter and the associated cabling. Also (not so much a gratuitous plug as an idea to copy) you can put a guard ring on the outer position which solves most potential chain drops and also helps to keep your trousers out of the chain.

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