CHASSIS
The body is built with 28 mm pipes and can be traced to the geometry of the auspicious Series “R”. It offers excellent performance with medium-hard tyres and is very sensitive to control which allows the driver to immediately personalize the set-up based on his driving style. Both versions offer a removable tank and HQ Freeline accessories. The variable wheelbase of model AR 28-Z is a definite advantage in adapting the chassis to the various types of tracks present in America in terms of cohesion and length.

BIREL RACING LINE - AR 28-RX/Z

Besides the confirmed AR 28-Z it will also be available in the AR 28-RX version developed for the Mini Rotax category.
Both chassis are built with 28mm pipes and offer the driver immediate feeling due to excellent balance.
Model AR 28-Z is characterised by the possibility of varying both its wheelbase (1010/1020/1030), and its height due to a specific rear bearing flange A. In order to be able to quickly make this change, the brake caliper B is mounted on the upper part of the disk.
Moreover, the seat supports allow it to house even 4t motors, making this the ideal kart for any type of national competition.
Model AR 28-RX, on the other hand, has a fixed wheelbase (therefore even the brake caliper is mounted in the traditional manner) and was developed according to the basic technical regulations of the Mini Rotax class.

CHASSIS AND EQUIPMENT
The R 30-CY chassis for years has been a top selling model for Birel in the National and promotional Trophy segment, effectively combining tuning ease and performance It offers HQ Freeline accessories and magnesium rims

AR 28-RX	AR 28-Z
It was developed for the Mini Rotax category with the objective of making it very “free“ in order to best take advantage of the limited motor strength in the youth category. It is precise when entering a curve, without “losing“ its rear cohesion with the track.	It guarantees excellent feeling to even the less expert driver, besides excellent performance with various types of tyres and motors. With little intervention the base set-up can be determined to make it fast on any type of track.

for the Motorsport version, while the base model is marketed with aluminium rims and accessories. Both versions have the 40mm axle and CIK 03-08 bearings.

BRAKES SYSTEM
The braking system is one of the most important differences between the “base” and Motorsport versions. Both models use a hydraulic system with cast-iron disks, but the Motorsport (“B“) version is the latest generation and guarantees, besides an excellent design, also better efficiency.