It appears to be a 1970s bike (I would take a stab at a Yamaha LT3) and by that period shutter speeds of 1/500 or 1/1000 were readily available amongst better quality cameras. That would be plenty to get a clear shot of the spokes on what would be a relatively slow moving bike (I would assume <40km/h, likely noticeably less). I've got several 50s era cameras that have 1/500 top speeds, so even if the bike was new at the time of the photo it didn't require a new camera to take the shot.