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One less tooth means about 2mm less radius, probably not enough. You can't move Omnomnoms to the right, at least not by much. You could face a bit off the NDS of the BB she'll and maybe shim between the axle step and the NDS bearing, but that's a lot of hassle for 1mm.
Custom dished chain ring is obviously the way to go, should be no more than £300 if we bundle it in with my 56T VumaChrono special ☺
gbj_tester-
Technically they aren't Omnoms... they are the cheaper S100 1.1 cranks, and a power spline bottom bracket. I'm not even sure how possible it is to space out the power spline BB, but I'll have a look this evening.
Custom dished chainring makes obvious sense on a bike that has so far cost a grand total of £140 including the cost of a couple of tools I was missing! :-)
ewanmac
What's the solution to this? It rubs, only just, but it definitely rubs. @mdcc_tester would your 55t chainring have a small enough diameter to fit? What are the other options? Crimping the chainstay seems a bit drastic?