Lightweight CF3 carbon framed aero bike with race proven ProTour geometry equipped with Shimano 105 Di2 2 x 12 drivetrain Vision SC60 carbon wheelset and Shimano 105 hydraulic disc brakes. The Reacto has always been a class leading aero bike combining state of the art aerodynamics with rider comfort. The latest generation incorporated wider tyres for increased comfort but adding wider tyres resulted in aerodynamic compromises so a myriad of small improvements were required to over-compensate. In the World Tour no area can be ignored. Computational Fluid Dynamics CFD was used to model virtual wind tunnel performance guiding the changes which offered the most aerodynamic benefit: Tiny details like integrating the front Disc Cooler behind the fork and the rear disc caliper in the rear triangle and creating new bolt through axles with the thread integrated into the fork dropout minimise drag and improve aerodynamic performance. The Reacto CF5 needs just 209 watts effort for 45 km/h speed All Reacto have powerful hydraulic disc brakes with chainstay mounted calipers for better brake force dissipation. The flat mount standard keeps everything neat whilst sitting calipers on CNC'd aluminium Disc Cooler fins helps reduce operating temperatures by up to 35%. Cycling Weekly described it as 'without doubt one of the most complete bikes available on the market' Cyclingnews 'an utterly brilliant and faultless machine' and Cycling Plus were 'hugely impressed'. Highlights: Aero optimised CF3 lightweight carbon frameset approx. 1 150g in size M Shimano 105 Di2 24 speed groupset Vision SC55 carbon wheelset Shimano 105 hydraulic discs Continental Grand Sport Race 28c tyres Merida S-Flex seat post Disc Cooler technology FRAME CF3 IV - carbon with the same geometry and aeroydanmic profiling as the CF5 IV with a more budget friendly carbon lay up. Tapered headtube Disc Cooler BB86 BB standard 142 x12mm axle standard. Max tyre size 700 x 30c FORK Reacto CF3 IV Disc; material: carbon; 700x30C max. tyre size GEARS  24 SHIFTERS Front: Shimano 105 Disc Di2 Rear: Shimano 105 Disc Di2 FRONT DERAILLEUR Shimano 105 Di2 REAR DERAILLEUR  Shimano 105 Di2 BOTTOM BRACKET Shimano SM-BB71-41B; Pressfit 86.5 CHAIN  Shimano M6100-12 CHAINSET Shimano 105 R7100; 52-36 tooth chainset; Crank length: XXXS - 160mm XXS-XS - 165mm S-M - 170mm L-XL - 172.5mm CASSETTE Shimano 105 R7101; 11-34 teeth; 12 speed BRAKE LEVER Shimano 105 FRONT BRAKE Shimano 105; Hydraulic disc with Shimano CL700; 160mm REAR BRAKE Shimano 105; Hydraulic disc with Shimano CL700; 160mm GRIP Merida Road Expert HANDLEBAR Merida Expert CW; material: aluminium; XXXS-S - 380mm wide M-L - 400mm wide XL - 420mm wide STEM Merida Expert SL 2PII; material: aluminium; -9 degree rise; Length: XXXS-XS - 90mm S - 100mm M-L - 110mm XL - 120mm HEADSET Merida Team SL OP-203 neck PEDALS Not included SADDLE Merida Expert SL; 6% recycled and 23% nature material; V-mount; incl. Merida minitool SEATPOST Merida Team CW; Aero shape; 15mm layback; material: carbon WHEEL SIZE 700C RIMS Vision SC 60 Disc brake; 100x12mm; 142x12mm; 23mm inner rim width; 60mm rim depth; Centerlock; material: carbon; Tubeless tape ready SPOKES Part of wheelset - Vision SC 60 Disc brake FRONT HUB Part of wheelset - Vision SC 60 Disc brake REAR HUB Part of wheelest - Vision SC 60 Disc brake FRONT TYRE Continental Grand Prix TR; 700x28C; kevlar bead; tubeless ready REAR TYRE Continental Grand Prix TR; 700x28C; kevlar bead; tubeless ready Colour Teal/Pearl Team Other Garmin Carrier + Garmin insert*2 + GoPro/Light Mount Disc cooler F/R and Merida Multitool with saddlebox