After the success of the SL730 and SL950 models Carrera engineers wanted to create the best of both these models and the result is SL7. A medium size SL7 frame weighs 830 grams so it is in the middle of 730 and 950 models. And the rigidity is amazing 97N/mm. Very simply this bike is extremely light but has superb power and performance. The SL7 represents the top range of racing bicycle frame from Carrera. In order to achieve these results Carrera went to Toray Industries and selected T800 and M46J carbon material and then used the EPS (Expandable Polystyrene Shell) technology to orient and compact the carbon fibers. And like the other SL frames a special graphite epoxy resin is used to hold the frame together and increase the strength of the structure. Special shapes of the tubes maximize comfort without giving up the stiffness and performance of the ride. The SL7 frame built with top level components can be built in the 14lb range and at same time has superb stability and performance. The bike excels in climbing and has great qualities on the descents with confidence at sweeping turns and at speed. Perhaps no other ultralight bicycle has the complete performance package as the SL7.
Materials & Production Process Features:
50% 30Tons High Modulus/High Strength T1000 Carbon Pre-Preg with Carbon Nanotube Matrix
30% 46Tons Ultra High Modulus HS40 Carbon Pre-Preg
10% 65Tons Super High Modulus Pitch Carbon Pre-Preg
10% Ultra High Strength Mutiple Axes Carbon Woven
The application of high-performance composite materials technology and special graphite fiber/epoxy, which is the same material system applies on the structures of Aeronautics, Aerospace (A380 & B787) and Automobile (Super Car).
Advanced VaBM + EPS (Vacuum Bladder Moulding with EPU shell) process
Its clear enough that lightness and stiffness contradicts each other and the only way to put them together is the correct choice of the materials and the
geometry of the carbon tubing. Regarding the material, the choice of the carbon fibres is huge and sometimes very confusing.
Nevertheless, because its too important to consider the combination of the stifness/resistance/workability features at a time, we narrowed it down to a selection of T800 e M46J fibres, made by Toray Industries inc.
Still, its not enough to study and choice the material. In order to make the best out from the carbon fibres in terms of mechanical performance, the moulding process has to be very accurate: the carbon layers have to be properly oriented and then compacted in order to create a solid laminate with no molecular porosity and no heterogeneity. How we could achieve that goal? The EPS technology (Expandable Polystyrene Shell) makes it possible: during the Cure Process (this is when the resine dries and the laminate gets solid thanks to pressure&temperature) the orientation of the carbon weft doesnt change its original structure and the result is an excellent internal finishing of the carbon tube and above all a better quality of the frameset in terms of performance and lightness.
Frame weight 890gr. size M
Front fork FF43 carbon 60HM UD 1-1/8 1,4, 370gr.
Integrated headset system 1-1/8 1,4
Bottom bracket press fit 86×41
Integrated rear dropouts
Internal cabling ready for electronic shifting ICRS
Integrated gear cable guide
Design & Technical Features:
Round shape of the carbon fiber tubes and cross sections with the ratio of the two orthogonal axes close to almost one. This helps a lot to obtain a higher Moments of Inertia which is necessary to calculate the tensional stiffness which, combined with the composite materials, enhances the global stiffness of the frameset (97N/mm as a result of the frame free lab-test).
Bottom bracket position: SL7 has the proper compromise when we consider the drop measurement of the Bottom bracket. Just like in the racing motorbike, the center of gravity (barycenter) has to be as low as possible. Of course, because of the safety requirements ISO 4210, the drop measurements has a limitation and our engineers found the optimal drop which is about 268mm.
Functional junction area 1. The top tube/seat stays joint shows how the structural continuity is excellent in aesthetics terms but above all in terms of performance: the flattened and widened shape of each seat stay gives the frame a high responsiveness during the accelerations which is even more enhanced because of the top-end joint of the 2 seat stays: the distance in between has been made larger in order to increase the torsional stiffness.
Functional junction areas 11. Chain stays/Down tube/Seat tube. The 2 seat stays are asymmetric as well as the down tube and the seat tube. These joints have been optimized thanks to the FEM (Finite Element Method)
The SL7 geometry is based on the Stack and Reach system.
Compared to the traditional bike size listing, the potential benefit is multi-fold.
STACK refers to the vertical distance between the bottom bracket and the head tube top.
REACH refers to the horizontal distance between these two points.
Basically when using this method X/Y coordinates are detected and the distance between them is calculated. The frame is considered in a coordinate system where the x-axis describes the horizontal distance, whereas the y-axis refers to the vertical distance. Now the bottom bracket can be defined exactly by its X/Y position. The same is true for the position of the head tube top. The difference of the respective x-values gives the REACH value while the difference of the y-values results in the STACK value.
This method improves the comparability of geometries if the construction of the frames differs. The current triathlon machines with their shortened rear end, the integrated seat posts and stems are the best example for the usefulness of
the Stack & Reach method. The fewer adjustment possibilities the frame offers, the more important is a match between frame-geometry and rider-anatomy. An example: If we detect that the present frame is too long during a triathlon fitting we can calculate the recommended reach value for a new frame. Additionally, the stack value helps determining the matching saddle/ handlebar differential, so that few spacers need to be used. Important to note: The Stack & Reach values must not be regarded in isolation. The cockpit with the components handlebar form (having its own additional reach), stem-length and -angle should necessarily be considered when recommending a new frame or fitting an existing one.
Material: T-800HM-HS 60T SHM XN60 special nano UD
Fork: FF43 Carbon 60HM 60HM 1-1/8 – 1,4 weight 370gr.
Bottom Bracket: Press Fit 86X41
Seat post diameter is 31.6
Assembly System: Monocoque advanced process
Integrated Headset System: 1-1/8 – 1,4
Rear Dropouts: Carbon integrated Chainstay
Frame Weight: 880gr. size M
Ready for Electronic Systems
Groupset: Shimano Ultegra 11 Speed
Wheelset: Shimano RS11