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@GA2G
Funny that you mention it singspeed, but I had been considering adding those u-lock type disc-locks to the lists. I wanted to get to a motorcycle shop first and try some of them out for size purposes. I imagine they all would lock a rear wheel and seatstay together which would leave a main lock to secure the front wheel and frame to an immovable object. Or they could just secure a front to railings, leaving a bigger main lock to secure the rear triangle to a fixed/secure point.
I'll add those that are 16mm to this list, and those that are 13mm/14mm to the Secondary Locks list....once I've had a chance to try their sizes out.
This Oxford Nemesis 16mm disc lock could be classified under main locks, ONLY IF it can get around the seatstay, securing the wheel, and encompassing one railing of the church fence type of wrought iron railings. If it can't, then its not a good enough solution. It would be then used only for the front wheel.
These locks could all be used for front wheel security duties - Bike It Mammoth, Bike It Rotating, and the Kryptonite Evolution. There are others, but those were just a small sample.
I don't agree with your chain, as there is quite a lot of evidence to say that only chains with links of 16mm and greater, provide absolute protection against longhandled boltcutters. Anglegrinders will defeat any lock, given enough time.
But essentially, anyone can secure their front wheel with a 14mm disc lock, for only £9.99, or pay more and have the peace of mind of 16mm steel thickness.