Paire de roues Shimano Dura Ace WH-R9270-TL 28 Center Lock en carbone

Product Description The Dura-Ace WH-R9270-C36-TL Wheelset by Shimano - For new uphill track records The Shimano WH-R9270 wheelset has 36 mm high carbon rims and is the perfect complement for your Dura-Ace R9200 road bike groupset with Center Lock disc brake. Its Direct-Engagement aluminium freehub provides increased drive efficiency, and is compatible with 12-speed cassettes only. The tubeless high-performance model earns points in hilly terrain and on the mountain thanks to its light weight. The rims have a jaw width of 21 mm for tyres up to 32 mm wide, and feature the wind tunnel-tested D2 Aero design. They were each fitted with 24 double butted stainless steel spokes, with a specific lacing pattern used on the rear wheel to balance the spoke tension. At the centre of the wheels rotate 12 mm thru-axle hubs with E-Thru technology for more torsion resistance. The stainless steel cup & cone bearings are durable and easy to maintain. Specifications:Application:RoadWheel Size:28"Tyre Type:clincher tyreNumber of Spokes:24Brake Type:Center Lock DiscTubeless System:TL/USTTechnical Information - Rim:Type:D2Rim Flange:with hookDimensions (ETRTO):21-622Inner Width:21 mmOuter Width:28 mmDepth:36 mmValve Hole Diameter:SV/Presta (6.5 mm)Rim Material:carbon (CFRP)Technical Information - Front Hub:Over Locknut Dimension:12 x 100 mm thru-axleBearings:cup & coneBody Material:aluminiumTechnical Information - Rear Hub:Over Locknut Dimension:12 x 142 mm thru-axleBearings:cup & coneBody Material:aluminiumFreehub Body Material:aluminiumFreehub Body:direct driveTechnical Information - Lacing:Front Lacing Pattern:2-crossRear Lacing Pattern:OPTBAL (2:1)Spoke Type:straight pull / double butted (2.0-1.5-2.0)Spoke Material:stainless steelNipple Material:aluminiumApproved For:Recommended Tyre Width:25-622 to 32-622Features:very light tubeless wheels for top performance on the mountainflat aerodynamic D2 profile, tested in the wind tunnelrear wheel with 2:1 lacing to compensate for tensionsonly compatible with 12-speed cassettesfreehub with engagement mechanism for increased stiffnessstainless steel ball bearings, CBN fine machined, contact sealsaluminium axleslacquered rims, anodised hub bodyTechnology:D2 Rim The shape of the Shimano D2 rims has been optimised with regard to both frontal winds and crosswinds. Extensive studies in the wind tunnel and on the road have shown that a wide rim profile with a deep rim well and flow angles of 0 to 15 degrees reduce drag the most. At the same time, this rim shape increases the lateral stiffness of the wheel and improves its vertical compliance, which provides more control, comfort and durability. Cup and Cone Bearings Angular contact ball bearings of the cup & cone type are superior to sealed cartridge bearings in terms of load carrying capacity, as they distribute lateral and vertical forces better, and thus run particularly smoothly and last a long time. They are also easier to adjust, maintain and replace. E-Thru E-Thru is a tool-free thru-axle system from Shimano that optimises the stiffness-to-weight ratio and ensures easy handling via its reliable internal cam mechanism. It is characterised by a high torsion resistance and thus also supports cornering at high speed. E-Thru thru-axle hubs and thru-axles are available in the corresponding over locknut dimensions for front and rear. Direct drive (Direct Engagement) The Shimano Direct Engagement freehub is a ratchet freehub, which has the advantage of a much larger contact area compared to pawl systems. This leads to more drive rigidity. Thanks to its spiral shape, the outer and hub ratchet also engage firmly. This results in highly efficient and reliable energy transmission. OPTBAL Shimano OPTBAL is an asymmetric rear wheel lacing pattern that uses more spokes on the drive side than on the non-drive side. Symmetrical 1:1 lacing in combination with modern, wider-dimensioned cassettes can lead to uneven spoke tension, which puts excessive stress on the right-hand spokes. Spokes are more likely to break or nipples to come loose. OPTBAL counteracts this, balances the spoke tension and thus increases the stiffness, stability and durability of the wheel. Colour Info:black: Rims: black (carbon)Hub: blackSpokes: blackNipples: blackModels:28" set (front 12x100 + rear 12x142) Shimano Road 12-speed: Freehub:Shimano Road 12-speedGearing:12-speedManufacturer Number:E-WHR9270C36LFEREDXContents:1 x Shimano Dura-Ace WH-R9270-C36-TL Wheelset (front & rear)2 x rolls tubeless rim tape (applied) Weight: black | Non Boost | Non Boost | 142 mm | 100 mm | 28" | Shimano Road 12-speed | 100 mm | Shimano Road 12-speed | 100 mm | 142 mm: 1350 g Manufacturer: Shimano Europe B.V. High Tech Campus 92 5656 AG Eindhoven Netherlands info@shimano-eu.com