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@gbj_tester
I don't know what dimensions they have. The logical way to build them would be with 15mm from the disc mounting face to the inner face of the dropout, which combined with 120mm OLN would give a chainline of 46.5mm with a bolt-on sprocket. Normal front hubs (e.g. HB-M756) give a 41.5mm chainline with a bolt-on sprocket, so they are pretty close to normal track spec and easy to respace for wider chainlines. The trouble is, the M756 is the only commonly available one which can be converted with OTP components, and the drillings are a bit limited. Not that it should be a problem on the kind of bike for which a 16T minimum sprocket is acceptable.