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there's something about hub torque from fixed braking that I don't understand
If you don't hop, the reverse torque you can apply is significantly less than your forward starting torque. 24H is plenty as far as the hub is concerned, the limit will be the rim. If your rims are OK as a road build, they will be even safer as a fixed build.
gbj_tester
Only very tangentially related. I've got a set of Stans ZTR340s in 20/24 hanging about, and was thinking about building a super-light fixed wheelset using either Novatec or Ridea hubs. Assuming I use a half-decent spoke like a Sapim D-Light, and go 2-cross at the rear, does this sound viable or stupid? 80kg rider, no skids ('cos I don't know how yet, and tubeless tyres are expensive anyway), street use only.
I should add that I've done about 4,000km on these rims built up for a road bike, so I know they'll hold up under me, it's whether there's something about hub torque from fixed braking that I don't understand. I wouldn't build a 24h disc-braked wheel, but that's instinct not science and my legs can't stop like discs in any case.
[The tangential point is that ZTR340s are hopelessly prone to deformation after tyre fitment, to the point that I would end up retruing and retensioning them with the tyre fitted. Pacenti SL23s, for example, are 100g heavier and don't have this problem.]