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TKART magazine First Analysis | C28 S11. The Mini Kart by Birel ART
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First Analysis

C28 S11. THE MINI KART BY BIREL ART

Max Bernardi
20 December 2019
Important innovations for the new chassis for the 60 cc motorized categories presented by Birel ART for the 2020 homologation. A frame with a new design that optimizes the performance and the consistency of the tires during the race, as well as new accessories with the utmost attention given to their details.
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CHASSIS
BRAKE SYSTEM
THE OPINION
ACCESSORIES
ADDED VALUE
TECH SHEET
After an exciting season, culminating with the victory in the 2019 KZ FIA Karting World Championship, Birel ART has thought about the classes for the youngest drivers presenting the new C28 S11 for the MINI categories. The chassis has a renewed design, in particular in the fuel tank area, where the frame makes a double curve compared to the previous model which featured only a single curve. The design has features that are reminiscent of higher category chassis and it has been designed with the aim of increasing performance while improving the consistency of tires’ performance. An additional change is in the seat attachment, which has been revised to facilitate its fastening. The system allows you to screw some brackets into the chassis, tilting them in several positions without having to alter the frame’s attachments and incurring the risk of breaking them. Additionally, with this system, the chassis is freer from the tensions caused by an incorrect fastening. On the Cs of the C28 S 11 we find an 18 position adjustable ring nut to characterize the geometry of the caster and camber. There are two fastening screws on the ring nut, to guarantee a tight adjustment even when the chassis is stressed on the track. The support of the adjustable steering column (above the fuel tank), a distinctive feature of the Lissone company is verified on the C28 S11. By loosening a single screw, it is possible to vary the inclination of the entire column to adapt the cart to the driver’s height. The steering column has three adjustments on its plate, offering increased options for setting up the Ackermann angle. The support is an open case, in line with the Birel ART higher chassis categories and has several holes to modify the position of the footrest board, thus offering different positions depending on the driver’s stature. A new axle bearing support flange with a compact dimension stands out at the rear, specifically designed for the needs of the mini chassis.
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CHASSIS
BRAKE SYSTEM
THE OPINION
ACCESSORIES
ADDED VALUE
TECH SHEET

Birel ART, differs in the fact that it does not do what many other manufactures do, it does not mount the front caliper of the KZ on the Mini, using instead a specific model with homologation code 02/FR/14.The system consists of a caliper with a separate mechanical and hydraulic parts, a characteristic which allows them to keep a lower oil temperature, favoring a constant performance even when the brakes are repeatedly stressed.   
The master cylinder does not have a stroke recovery. A very precise choice by Birel ART for the 60 Mini class, in which the engine power is lower, and the stroke recovery can lead the pads to rub against the disc even if the brake is not applied. On the contrary, the system without stroke recovery leaves a few millimeters of distance between the disc and the pad, thus eliminating the problem. The disc has an external diameter of 150 mm  and is neither floating nor self-ventilated

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