The fast forward f6c carbon tubular wheelset are control wheels come with four additional spokes in the front and rear wheel compared to the standard wheels the f6c also comes with a darc profile on the 58mm deep carbon clincher rims its a great aerodynamic wheel that accelerates quickly and maintains speed very well these fast forward wheels are built in the netherlands onto ffwd hubs with 24 front and 28 rear sapim cx ray spokes and dt pro lock brass nipples the ffwd hub has a 11 speed s