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The fREELINE Category KZ String is an official security piece of origin manufacturer (Original Freeline / Birel Art). It is specially designed to surround the chain transmission of Karts equipped with 125 cc gearbox motors (TM Motor, Vortex, Iame, Modena Engines).
In KZ category, rotational speeds and string voltages are extreme. This enveloping crankcase fills two essential functions:
The driver safety: It forms a robust shield that prevents hot grease projections on the driver's combination or back. In case of high speed chain case (more than 15,000 rpm), it retains the chain to prevent it from injuring the driver or damage the peripheral accessories (exhaust jar, radiator, hoses).
Technical compliance: Its ultra-protective design scrupulously meets the safety requirements of the CIK-FIA's national and international regulations.
Made in a high black density technical plastic, it is both ultra-light and extremely flexible to absorb the constant vibrations of the 50 mm back shaft without cracking.
Chassis compatibility: Birel Art, CL Kart (Charles Leclerc), Ricciardo Kart, Kubica, LGK
Category: KZ / KZ2 (gearbox motors)
Material: Polymer injected high performance hydrocarbon resistant and impacts
Design: Optimized enveloping shape for not interfering with the rear brake caliper or the exhaust pot
* "Hi the artists of the gearbox! In kz, the stringwind is subjected to tade due to the vibrations of the shaft of 50 and the direct proximity of the exhaust pot heating very strong.
My trick for a time mounted in time: neverck Never the plastic chain worm directly against your metal fastening tabs without rubber washers (silentblocs). If you tighten the hard plastic against dry metal, 15,000-turn motor vibrations will end up cracking the housing around screw holes in less than two race weekends.
Drag a small rubber washer on each side of the plastic before putting your screw and your self-fired nut (nylstop). The crankcase will have the flexibility necessary to cash the chassis work. And last tip: after each round, pass a quick cloth stroke inside to remove the excess of accumulated chain grease. It avoids that the crankcase breaks up and vanish against the crown! "*
Place the kart on his carriage. To have perfect access to the right transmission, remove the right rear wheel (engine side) and the side body panel if necessary.
Present the FREELINE stringholder above the Crown / String assembly. Verify that there is a sufficient safety space (at least 1 to 2 cm) all around the crown to avoid friction when the Flex Flex chassis.
Align the anchor points with the chain carrier attached to the chassis. Apply the trick to Michel: Insert rubber washers to dampen the vibrations, then pass your screws.
Tighten the nuts firmly but progressive, without completely crushing silentblocks. Launch the hand-in-white backtrall: the chain and the crown must rotate perfectly free without touching the plastic crankcase at any time.
Q: Is this string-compatible handwright with a monowned kart (Rotax Max, Iame X30, OK) ?
A: Not. On a monovite kart, the engine is located closer to the seat and the alignment of the chain is different. KART KARTS have the offset engine and the transmission requires this specific enveloping form. For categories without box, opt for light standards string models (open or semi-open).
Q: Does this freeline housing adapt on a chassis of another brand (ex: Tony Kart, CRG) ?
A: Yes, the chain's barrier itself can adapt to other KART brands KAZ, because the arrangement of the crown and chain remains substantially identical to one kz to another. However, you will need to ensure that your chassis attachment legs are compatible or adjustable with the centerpiece of this crankcase.
Q: Does the kit include metal fastening legs at the chassis ?
A: No, this product includes the freelated black plastic housing alone. Welded or screwed metal brackets at the chassis tube are part of the frame accessories and are sold separately if your chassis is not already equipped.
The CRG Kt2 is the versatile chassis par excellence of the Italian manufacturer. Unlike the Rébec Road (more rigid), the KT2 uses a frame compound full of tubes of 30 mm in diameter. This architecture offers controlled flexibility, ideal for freeing the engine in categories without gearbox like the OK, Iame X30 or the Rotax Max.
Its geometry allows fast adaptation to all track conditions (high grip or green track "). Featuring the last components of the range CRG RacingHe combines exceptional motor skills at a surgical front train accuracy.
The CRG KT2 2026 Version Kz redefines the standards of the Queen category. While the Road Rebel (32mm) remains the choice for the tracks with very high grip, the KT2 in 30mm Has become the favorite weapon of Kz pilots looking for more agility and ease in the support changes.
For 2026, CRG Reworked the composition of chrome-molybdenum steel to provide a better response from the front train during degressive braking. This KZ version stands out for its localized structural reinforcements and its integral front / rear braking system, essential to stop the power of 50 horsepower engines
The hub of 35 mm long is considered a "short hub". In karting, The choice of hub length is a fundamental adjustment tool:
Short hub (35 mm): It offers less contact surface with the axle than models of 75 or 90 mm. This usually allows to have a "freer" behavior of the rear train, Helping the chassis to be free from curve, Ideal on tracks with a lot of grip (adhesion).
The hub of 40 mm long is often considered the "standard" or "versatile" value on adult karts equipped with a 30 mm (x30, axle, Rotax, Kz, ok). Unlike very long (75-90mm) hubs that considerably rigidify the rear, or the very short (35mm) that fully freed the chassis, the 40 mm Offers neutral and healthy behavior, ideal for starting a setting session before refining.
The hub of 85 mm is a "long" adjustment room. In karting, the choice of the hub length is directly related to the leverage exercised on the axle:
Stability and Grip: With 85 mm, you increase the rigidity of the rear train and removing the load outward. This is the ideal tool for more moving output output or to expand your back path without stacking spacers (which weakens the assembly).
R2.0 version: This name indicates an evolution of design at CRG (best machining, optimized weight and anodized finish "Gold" for higher resistance to corrosion).
The 95 mm in magnesium is an extreme room. This is not comfortable equipment, it is a precision tool for high-level drivers (KZ, OK, X30 senior categories).
The hub of 95 mm is one of the longest models available in the range CRG. In karting, the length of the hub is directly correlated to the "lever arm" applied to the axle:
Deported support: With 95 mm, you drop the load of the wheel outwardly. This helps to charge the rear train in support more, ideal for tracks where you miss moving out of turn.
Aluminum rigidity: Unlike magnesium, this aluminum version offers high structural stiffness and excellent durability, while being easier to maintain and less sensitive to oxidation. Finishing Gold (anodized) effectively protects the part against premature wear.
The 105 mm in magnesium is a high competition room. This is not a basic setting, it is a specific solution for specific needs:
Maximum lever arm: With 105 mm, you drop the load outward to load the outer rear tire. It is the absolute weapon when the kart is sorely lacking on the turn out of turn.
System "2 screws": In a length of 105 mm, a one-screw tightening would be insufficient and would create an imbalance. The system to 2 screws Allows you to distribute the tightening force over the entire length of the ring, ensuring a perfect maintenance on the axle without creating a single voltage point.
Magnesium (mg): It offers valuable weight gain on non-suspended masses and thermal dissipation that stabilizes the pressure of your tires during long finals.
The FREELINE Category KZ String is an official security piece of origin manufacturer (Original Freeline / Birel Art). It is specially designed to surround the chain transmission of Karts equipped with 125 cc gearbox motors (TM Motor, Vortex, Iame, Modena Engines).
In KZ category, rotational speeds and string voltages are extreme. This enveloping crankcase fills two essential functions:
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