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@gbj_tester
I think 24 spoke wheels should appear stationary at approx 10mph under a 50Hz strobe, per street lighting, but also at 24/25 of that speed and 23/24 of it etc, i.e. very small speed variation will kill the effect. On a PLL drive locked to a quartz crystal, the speed variation should be very small, but on a bike the speed variation through one complete cycle of the cranks is likely to be too much to get a good effect.
That also should mean I could get my trispoke to look stationary if I film at 30fps and 48mph as long as I have enough light to get the shutter speed down to about 1/500s. A plan is emerging...