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Yes, these are the Conti Urbans which I had to bend the mudguard stays straighter to get the clearance but it’s all good now.
With regards to the mission, try not ordering a single fixed Phil hub first time around (because the non drive side flange gets fouled by the chain stay). THAT was an expensive mistake.
Also, a lot of filing and messing with the tensioner to get it all to fit.
And getting the gearing right because even with a half link, the tension must be just right so the tensioner doesn’t flick up and hit the stay.
To paraphrase Sir Steve Redgrave, if I ever decide to convert another Brompton to fixed, someone please shoot me.
To say this was a mission is an understatement, but I’m indebted to @Littlepixel and @danstuff for their help and advice, and it rides soooo much better than stock. The 56/12 is a little short on the GIs, but I can live with it for now.
If anyone wants pointers I’m happy to advise, as hopefully you can learn from my mistakes!