ROTOR Crank Set ALDHU 3D + for road bike 1-speed Q-Rings | Direct mount oval
With the ALDHU 3D +, ROTOR brings the lightest crank in its history to the market. The name is an abbreviation for the legendary Tour de France rise of Alpe d'Huez, where Carlos Sastre laid the cornerstone for the Tour overall victory in 2008 with Rotor Q-Rings and thus gave ROTOR one of the biggest victories in the company's history.
For the greatest possible adaptability, the ALDHU crank system has a modular design. Thus, the chain line for disc and rim brake hubs can be adjusted via 2 different shafts and the 110 mm 4-hole Spider can be exchanged for ROTOR's new Direct Mount chainring combinations or for a 1-way Direct-Mount chainring. For optimum adjustment of the oval ROTOR Q-Rings chainrings, the OCP (Optimum Chainring Position) system has been further refined. Through a combination of different positions of the crank arms on the crankshaft and a fine-styled Spider recording the position of the chainrings can be adjusted in 1-degree increments.
The crank arms made from ultralight 7055 aluminum are manufactured using Rotor's proven Trinity Drilling System. Over the entire length of the crank arm material is removed from the central, neutral fiber of the crank arms in 3 channels. This material contributes only slightly to the load capacity of a component and can be omitted without negative consequences. The necessary rigidity and stability is achieved with lightweight construction over large outer diameter.
The ALDHU crankshafts are designed with 30 mm outside diameter as BB30 and can be driven via corresponding bottom bracket in frames with BSA, BBright (Cervélo) and BB30 bottom bracket. For optimum chain line there is a variant for 130 mm width rim brake hubs and 135 mm width disc brake hubs.
1-speed chainring spider combination | oval
The single block spider milled from a block of 7075 aluminum is mounted directly on Rotor's modular racing wheel crank systems. The sophisticated ovalization of the Q-Rings makes your kick more efficient, slowing down the fatigue of the muscles. When pedaling, they harmonize the natural strengths and weaknesses of the muscles. Thus, a better use of the stronger muscle groups is achieved and in the weaker muscles a balance in the working path (lower stroke) created. The Narrow Wide tooth profile ensures optimum grip of the chain even in off-road use and in poor road conditions, making a chain guide superfluous. They are available with 38 to 54 teeth, making them suitable for a wide range of uses from Cyclocrosser to triathlon bike.
intended use : road bike, cyclocross, triathlon
Material crank arms: aluminum 7055
Material chainring: aluminum 7075
Material crankshaft: aluminum 7075
Diameter crankshaft: 30 mm
Crank lengths: 165, 170, 172.5 or 175.0 mm
bolt circle diameter diameter: -
Spider: in the chainring integrated 4-arm Spider
Chain blade pitch: 38, 40, 42, 44, 46, 48, 50, 52 or 54
Ovalization: 12.5%, position adjustable in 1 ° increments
chain line : 43.5 mm (rim brake) or 46 mm (disc brake)
Q-factor: 148 mm (rim brake) or 153 mm (disc brake)
Compatibility Bottom Bracket: BSA, ITA, BB86, BB30, BB30A, PF30, BBRight, BB386 Evo (optional, not included)
Compatibility Chain: 9, 10, 11, 12 times
Crank Arms - 356g (172.5mm)
Crankshaft - 96g (rim brake version)
Sprocket Spider Combination - 156g (52 teeth)
Scope of supply: 1x rotor ALDHU crank arms (left, right), 1x rotor ALDHU crankshaft and 1x rotor ALDHU 1-fold chainring spider combination oval