Full description of the product (H1: Front hub KZ CRG 40x80 mm R2.0 black aluminum - complete)
The front hub CRG 40x80 mm (R2.0 range) in black aluminum is a part of the original manufacturer (Original CRG Share), specifically developed to meet the extreme constraints of the Queen category chassis Kz (gearbox).
With its dimensions of 40 mm inner diameter (for the large diameter rockets specific to KZ) and its 80 mm long, This hub of the R2.0 series offers an ideal support surface to stabilize the front train. In kz, the front braking and the motor torque require absolute stiffness: this CNC machined aeronautical quality aluminum hub enciesces these forces without flinching, avoiding geometric deformation in full support and guaranteeing a guidance of surgical accuracy. Its matte black anodized finish gives it excellent durability to the projections and the official factory team look.
Specificities of the "complete" model:
The hub is delivered assembled and ready to install:
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The hub body 40x80 mm in black anodized aluminum (R2.0 series).
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2 high speed rocket bearings 40 mm already fitted.
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The internal spacer aluminum calibrated to the thousandth.
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The 3 wheel studs high strength for fixing the rim.
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The clamping ring / locking screw integrated to index your settings.
👨🔧 3. Tip in Michel (the corner of the expert)
* "Hi the artists of the gear lever! In kz, the front train undergoes patients' constraints, especially braking with 4-piston stirrups. The hub R2.0 in 40x80, it is the classic to have a rigid and direct front train.
My old old trick: never go up these big bearings of 40 to dry on your rockets. Clean nickel the rocket axis with brake degreaser and put a very fine graphic grease or white grease veil. If you go up that dry, with the huge heat released by the front brake discs right next door, the bearing will spray by electrolysis on the axle. To get it out of disassembly on Sunday night, you will cry !
And be careful at the tightening of the rim on the studs: we squeeze the torque crosswise, no need for extension on the key, the hub aluminum must work flat! "*
📐 4. The assembly guide & maintenance: step by step
1.Dimony of security:5 min.Place the kart on his carriage. Remove the 3 rim nuts and take out the front wheel. Unscrew the central locking nut of your 40 mm rocket.
2.Nettoyage thermal:3 min.Take out the old hub. Inspect the rocket axis and the front brake disc. Clean the axis using brake cleaner and clean cloth to remove burned platelet dust.
3.Ajustement avant lanes:5 min.Place your rocket spacing rings according to the desired channel width. Apply the trick to Michel (fine lubrication), then dramatically slide the new complete hub CRG R2.0 on the 40 mm axis.
4.Verrouillage and verification:3 min.Replace the rocket nut in place. Tighten it firmly and then replace its pin or safety system. Launch the hub by hand: it must rotate without any suspect noise or hard point despite the presence of the brake disc in the caliper.
❓ 5. FAQ SEO (Frequently Asked Questions)
Q: Does this 40 mm hub adapt on a standard category kart (Rotax Max, x30) ?
A: Not. The category karts without box (single Speed) generally use 17 mm or 25 mm diameter rockets. This 40 mm hub is exclusively reserved for the massive rockets of the KZ (box) chassis, equipped with manual front brakes.
Q: What is the influence of the length 80 mm on the behavior of the kart ?
A: A length of 80 mm offers excellent compromise. The shorter (ex: 65 mm), the front train wins in mechanical flexibility and releases the kart if the track is too eager. Longer (ex: 95 mm), the front train stiffens to the maximum, which is perfect for giving instantaneous grip to the steering wheel on a cold or slippery track. The 80 mm is the most versatile intermediate size.
Q: Are the internal 40 mm bearings sold separately in case of wear ?
A: Yes, quite. Although this hub is delivered complete with its factory-mounted original bearings, the 40 mm bearings remain consumables you can replace later using a standard extractor, without the need to replace the aluminum hub body.