Not wishing to put a spoke in the thread (sorry...), there are now some very fine photo etched bicycles, complete with spokes, available to us aircraft modellers for use as airfield accessories. I know the scale is slightly out, but these are in 1/48;
http://www.hannants.co.uk/product/FHP4801B
And to show just how fine p.e. spokes can look, these are in 1/72 scale (I have a set, but not yet the courage to make them!);
http://www.hannants.co.uk/product/BRL72004
If it were me, I know that the lack of spokes on the bikes would eventually become somewhat of an irritant. Judging from the detail you show in your photo's Chris you are a much better modeller than I, so may well end up feeling the same eventually?
Keith
(edit as I managed to spell my name incorrectly. Oh dear...!!)