BIREL PRESENT THE MOTORSPORT CHASSIS FOR 2007 SEASON

CRX 32 –SV, CMX 32 – SV, CR 31 –SV E CM31 –SV, THESE ARE THE ACRONYMS WHICH IDENTIFY THE RANGE OF BIREL CHASSIS FOR THE 125CC CLASSES WITH GEARBOX. THE WHOLE LINE WAS DEVELOPED BY BIREL’S RACING DEPARTMENT WITH THE IMPLEMENTATION OF SOME IMPORTANT AND EFFICIENT TECHNICAL NOVELTIES.

Birel has four proposals for the categories with gearbox: two models of the R line (CRX 32 –SV and CR 31 –SV) and two models of the M line (CMX 32 – SV and CM 31 –SV). Chassis identified with the acronym 32 mostly adopt 32mm rails, whereas the 31 versions are realised with mixed 30 and 32mm rails. As for the chassis of the 100cc range, Birel Motorsport put a lot of work into optimising the performance of the bodywork, which feature some substantial structural novelties. The results achieved ensure better balancing than the last season’s models and a great compromise between grip and smoothness has been found. These results were possible also thanks to the efficient solutions applied to the front-wheel assembly; the ‘Cs’ of the small spindle, as well as the camber and the caster have been completely renewed. Cornering has significantly benefited from this, without upsetting the total balance of the chassis. Always at the front, the fastenings for two different torsion-bars have been provided for. At the rear on the other hand work has been carried out on the axle’s flanges and on the bearings, and the possibilities of adjustment of the chassis have also been increased. The 2007 range too, particularly with reference to the R series, is consistent with one of the characteristics of Birel’s chassis, which guarantee great adaptability to different types of tyres and tracks. Among the strengths of Birel’s 125 karts are undoubtedly the braking systems which, in the gearbox categories, are of critical importance. All the range features top accessories and great attention has been paid both to functional and design elements. Each karts comes complete with a Motorsport Pvc sticker kit. As to model selection criteria, giving advice is hard as a driver’s driving abilities could be better expressed with one chassis rather than another. According to the general guidelines of Birel’s Racing department, the CR 32 and CM 32 versions are at their most effective with medium/hard tyres and on slippery tracks. For National and International events which provide for the use of soft tyres and on dry tracks on the other hand, the CR31 –SV model is advisable.

<< THE 2007 RANGE IS CONSISTENT WITH ONE OF THE CHARACTERISTICS OF BIREL CHASSIS, WHICH GUARANTEE GREAT ADAPTABILITY TO DIFFERENT TYPES OF TYRES AND TRACKS.>>

Novelties

At the front two different torsion-bars can be adopted: the one further back gives more grip to the rear, whereas the second one improves the grip at the front. The ‘Cs’ of the small spindle, the camber and the caster are also new and give better grip at the front without jeopardising smoothness. The pitch of the rear bearing’s flange on the other hand can no longer be adjusted, in-depth tests having proven the 1040 to be the ideal pitch. Always at the rear, the bearing’s housings can be fastened vertically in various positions: the lower they are fastened, the higher will be the grip. The new flange also houses the ‘hybrid’ 50mm-diameter bearing: its external diameter is smaller in order to improve smoothness and reduce weight.

Design
One of the main characteristics of Birel’s karts is their design. As far as this is concerned, users are becoming increasingly more demanding and the market awards those products which can differentiate themselves in terms of personality, image and, naturally, technology. Many accessories are anodized in blue and great attention has been paid to even the smallest details. A practical example of this is the excellent workmanship of the braking systems.

CRX 32 –SV
Suitable for the top categories which adopt high-performance engines with medium/hard tyres. By adapting to slippery tracks, it guarantees remarkable grip. It is made with 32mm rails, with the exception of the 30mm cross rails level with the seat.

CMX 32 –SV
In comparison with the R 32-SV version, this one gives a slightly better grip, although it is suited to the same requirements. The rails are also equivalent; what changes is the design of the front which, in comparison with the R series, gives better cornering.

CR 31 –SV
Suitable for the soft-tyres categories, it guarantees the best performance on dry tracks. This is the most versatile solution for those drivers who take part in International programmes. One of the characteristics of the R 31 –SV model is that it is a very ‘free’ model and, as such, it can easily adapt to the Junior categories too.

CM 31 –SV
Similarly to the R 31 model, this one is also made with mixed 30 and 32mm rails although, thanks to different design solutions, it offers a more effective general grip; in this sense it could be placed between the R 31 itself and the RX and MX versions, which feature 32mm rails. This versatile model adapts very well both to fast tracks and to more winding ones.