Built on 30mm deep aluminum rims that are welded for superior strength this track-racing wheelset delivers an aerodynamic advantage and proven reliability.Versatile enough for everyday training and racing the rims are designed for clincher tires. Wide-dish hubs produce maximum stiffness and solid cartridge bearings laced with ultra-bladed straight-pull spokes form a rigid connection between the rim and hub.The rear hub has a double-sided thread so two cogs can be used on the same wheel making gear changes fast and easy. Key benefits Train and race with a reliable aero advantage. 30mm deep aluminum welded rim offers unbeatable aerodynamics. Low spoke count 20 front and rear. Ultra-bladed spokes. Quick acceleration maximum power transmission and low rolling resistance. Front and rear dishes optimized for incredible stiffness. QRM+ cartridge bearings ensure maximum rolling efficiency. Change tires and swap gears quickly and easily. Rear “flip-flop” hub lets you adjust your gearing depending on the track. Clincher rims for convenient tire changes. Spokes Count: 20 front and rear Lacing: front radial rear crossed 2 Nipples: brass ABS Shape: straight pull flat Material: steel Nipples: steel ABS Rims Tire: clincher Material: S6000 Aluminum Valve hole diameter: 65 mm Height: 30 mm ETRTO size: 622x15C SUP welding technology Drilling: traditional Internal width: 15mm Delivered with User guide Rim tape Fixing nuts Cog lock nut Multifonction adjustment wrench delivered with rear wheel Hubs Fixed cog Axle material: steel Front and rear bodies: aluminum QRM+ bearing preload technology Intended use Recommended tire sizes: 18 to 25 mm For a longer longevity of the wheel Mavic recommends that the total weight supported by the wheels doesn't exceed 120kg bike included Minimum cog width : 75mm Max Pressure: see indication on wheel and tire If they differ use the lowest of the 2 Minimum and maximum allowed tyre width: see indication on wheel Maximum tyre pressure: 84bar/121PSI with a 23mm tyre - 785bar/114PSI with a 32mm tyre Versions Color: Black only Compatibility Freewheel: fixed cog only flip-flop hub one cog possible on each hub side Cog thread: 137x24TPI Lock ring thread: left thread M33x1 Front axle: for fixing nuts only included M9x1 thread Rear axle: for fixing nuts only included M9x1 thread Information on specified weight The weight of the wheels is announced at +/-5% in XD/XD-R and Center Lock version without quick release nor valve nor rim tape