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We just adjusted the geometry so that the gearing I had in mind would fall near the the middle of the dropout adjustment course (dropouts are Paragon Machine Works Rockers and to compute the stays' length for a given ratio we used the fixmeup online tool). Then it's just a matter of making sure there's enough space on either side of the mudguard but you don't need that much.
cgg
yoshy
One of the reasons I've stuck with my cross-check was fantasising about building it up as FTF.
One thing I've struggled over though is getting a nice rear mudguard curve and maintaining it through different ratios etc.
@cgg @Skant are you intending on plumping for a ratio and sticking with it or designing in some kind of adjustability? I'm thinking of getting some kind of axle mounted mount made so the rear of the guard can follow the wheel position and just accepting a bit of gappiness at the front of the rear guard