A Camera raw convert, No Editing.........!!!
In camera One shot Double Exposure.....!!!
One shot double Exposure with Sigma 10-20mm, First Exposure at 10mm wide open (10 seconds) and 2nd Exposure at 10mm wide open in (5 seconds) panned 20 degree to the left, used lens cap to block view during the panning. Shot at "bulb". The wheel actually stopped during the exposure so the first part was shot during the wheel spinning and the second part during the wheel stationary.
Me and irashid007 flickr.com/photos/irashid007/2953411163/ had a go at Manchester Wheel, a second version of Wheel side by side can be viewed in his stream with same technique and differant result.