Among the most significant news at Birel’s regarding new CIK-FIA 2009-2014 homologations, we must highlight the new model featuring mm. 30 tubes, for KF classes and single speed in general (RY 30-S1), and for KZ - Shifter (CRY 30 -S1) categories. Whereas, models RY 31- S1 and RX 32 -S1for KF categories and models CRY 31-S1 and CRX 32 -S1 for KZ-Shifter classes, are an evolution of the previous homologation.
In terms of standard equipment and design technology, the whole range includes a 4th tube placed in correspondence with the removable seat (when removed the rear axle is ‘freed’, while when tightened it guarantees more grip) and new “large” mm 25 diameter front spindles, characterized by the possibility to vary the stem (with optional different material, as for the axles) by means of a specific key supplied with the kart.
"FL 09-14" fairings (which include new graphics PVC sticker kits) are employed; they maintain the aesthetic lines of the previous, but have been optimized reducing their weight by about kg 1.30.
Finally, the whole range is fitted with HQ silencer holders to facilitate rear fairing assembly, as well as with a new foot rest machined from solid.
Some optional elements for customizing the karts according to specific requirements of each class and pilot are available for all homologated models. Among them an important novelty is the opportunity to fit the rear axle with the whole range of Freeline magnesium components: hubs, flanges, brake disk holders and rim holders.
This option guarantees weight reduced by around Kg. 1.5 compared to that of standard components (aluminium), as well as a smoother frame. Also the brake system, the tested and effective “CX” model for the whole range, can be customized; the choice involves the brake disk type (or of the disks in the case also the front is fitted with brakes), which can be in steel or cast iron.
The first is suitable for pilots who prefer strong and decisive braking power, while cast iron allows more gradual braking power and optimization of operating temperature. Braking power effectiveness is very similar in both cases, therefore the choice is mainly bound to the pilot’s personal preferences. Customizing also includes the possibility to request any model fitted with Freeline by Tillet seat.
Homologated models
RY 30-S1 (KF) and CRY 30-S1 (KZ): the body is realized with mm.30 diameter tubes and its main feature is the distinctive design of the front axle, on which the spindles “Cs” are secured to the front beam. The front axle also bears only one torsion bar, which, if secured to the frame, generally makes the front axle more precise. The plan is very conventional and it is easy to drive, especially for obtaining ideal set-up. This frame is particularly effective with soft tyres and when the track presents rubber traces, as it often happens during summer races with high temperatures. But, thanks to the specific torsion features of the body, it can give good results also in Cadet classes (like KF 3 for example), which usually employ hard tyres. The advantage in this case is the versatility of the frame, which allows to make the best of the limited power of the engines typical of these classes.
RY 31-S1 (KF) and CRY 31 -S1 (KZ): the longitudinal members of the body are made of mm. 30 tubes, while the beam tubes are mm. 32. Body plan replicates previous R 31 model, with the spindles “Cs” anchored in correspondence with the largest torsion bar where the longitudinal members are secured to the front beam. The front axle presents also two available torsion bars, the largest mainly operates on front axle behaviour, the smallest increases rear axle grip. This model is an excellent compromise in terms of versatility, adapting very well to soft tyres as well as medium hard ones. Its strong points are its excellent fluidity and the general balance between front and rear.
RY 32 -S1 (KF) and CRY 32 -S1 (KZ): the body is fully made with mm.32 diameter tubes. The plan is very similar to RY 31-S1 and CRY 31 versions – It differs from them (as well as for the diameter and some technical specification of the tube) exclusively for the two folds of both the beams in front and behind the seat. This model is particularly suitable when grip is required, which means: tracks bearing scarce rubber residuals, mild temperatures and medium hard tyres. It is appealing to pilots for its precision in following bends and its braking stability.
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