The Madone SLR is Trek's best and lightest aero road frame, but it's the all-new IsoFlow technology that really sets this bike apart. It adds compliance for a more comfortable ride with impressive aerodynamics.Key Features & Benefits:Wireless Ultegra Di2: Delivers fast smooth and responsive shifts800 Series OCLV Carbon:Trek's lighest-ever laminate, making the Madone faster on any terrain, in any conditionIsoFlow Technology: Helps the seat mast flex for a more comfortable ride while also improving frame aerodynamics and shaving weightFull Specification:Frame: 800 Series OCLV Carbon, KVF (Kammtail Virtual Foil) tube shape, IsoFlow seat tube, invisible cable routing, 3S aero chain keeper, T47 BB, flat mount disc, 142x12mm thru axleFrame Fit: H1.5 RaceFork: Madone KVF full carbon, tapered carbon steerer, internal brake routing, flat mount disc, carbon dropouts, 12x100mm thru axleNumber of Gears: 24Gear Shifters: Shimano Ultegra R8170 Di2, 12-speedChainset: Shimano Ultegra R8100Chainrings: 52/36Rear Cassette: Shimano Ultegra R8100, 11-30, 12-speedChain: Shimano Ultegra/XT M8100, 12-speedFront Derailleur: Shimano Ultegra R8150 Di2, braze-on, down swingRear Derailleur: Shimano Ultegra R8150 Di2Bottom Bracket: Praxis, T47 threaded, internal bearingPedals: Not IncludedRims: Bontrager Aeolus Pro 51, OCLV Carbon, Tubeless Ready, 51mm depthFront Hub:Bontrager Aeolus Pro 51, 100x12mm thru axleRear Hub:Bontrager Aeolus Pro 51, SRAM XD-R driver, 142x12mm thru axle, Bontrager Switch thru-axle, removable leverFront Tyre: Bontrager R3 Hard-Case Lite, aramid bead, 120 tpi, 700x25 cRear Tyre: Bontrager R3 Hard-Case Lite, aramid bead, 120 tpi, 700x25 cBrakes: Shimano MT800, CenterLockHandlebars: Madone Integrated handlebar/stem, OCLV CarbonHandlebar Grips: Bontrager Supertack Perf tapeHeadset: Madone SLR headsetStem: Madone Integrated handlebar/stem, OCLV CarbonSaddle: 47-52 Bontrager Aeolus P2 Elite; 54-62 Bontrager Aeolus Elite, austenite railsSeatpost: Madone aero carbon internal seat mast cap, integrated light mount, 0 mm offsetAccessories: None IncludedWeight:56 - 7.48 kg / 16.51 lbs