CM 32-RX. It is suggested for slippery tracks. In respects to the CR 31-RX version, it guarantees a slightly superior grip offering better entrance into curves. The tube material is the same while the design changes in the height of the fuel tank.

CR 31-RX. Guarantees better performance on tracks that require more grip. It represents the most versatile solution in guaranteeing an optimal balance. From the features of the CR 31-RX model it is «free».

Birel’s proposal for the Rotax DD2 Trophy, which the last season was the object of deregulation in terms of chassis, will be, as well as the much tested and winning model CM 32-RX, also a version with CR 13-RX chassis.
For the Trophy promoted by the Austrian firm, Birel drivers will be
able to choose between two different technical solutions: the M version is more suited to particularly slippery tracks, whereas the R version is more conventional, with very good «smoothness» and best suited to dry tracks. Both models feature a special rear axle which allows the two-speed engine with direct drive on the (40 mm) axle to be fitted and HQ Freeline accessories, such as magnesium rims and anodised components in Motorsport livery. The braking system is a last-generation model, similar to the version featured on the 125 cc range, with 150 mm discs at the front and 200 mm discs at the rear.
The Trophy kit also features the gearbox levers by the steering wheel and the bumper in compliance with regulations, both supplied by Rotax.