I have a '98 Santana Arriva tandem that came with Aerospoke wheels. I bought the bike used. I have ridden it several times now and seem to notice a not-so-slight vibration in the wheels, especially at speed (about 20 mph). It seems to coincide with the gaps between the four blades (spokes)- although at speed this is very hard to tell obviously. Has anyone else experienced vibration with Aerospokes? Just wondering.