Summary: Why the 85 mm ?

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).

- Technical specifications

- Mounting Tuto: Expert Precautions

With a hub of this length, the assembly must be impeccable to prevent vibration or loosening.

1. Preparation: Clean the axle carefully to the brake cleaner. Anodized aluminum is sensitive to aluminum dust (oxidation) that can create game with time.

2. Setting up: Slide the hub on the axle. If it resists, check the key. Neither forcing to mallet, under pain of damaging the surface treatment "Gold".

3. Tightening (critical step):

   • The body of the hub being long, it is indispensable to tighten the bolts alternately.

   • Do not tighten a screw thoroughly before starting the other. Make several passages to balance the pressure.

   • Excessive tightening can deform the 85mm hub and create a hard point, which would make your axle "pinched".

4. Alignment: Verify visually that the hub rotates perfectly right. A long hub accentuates the slightest round-round of the axle.

💡 Michel's trick

"The 85 mm is for when you are looking for pure support. The trick: The length of 85 mm is very effective, but it makes the rear train very responsive to mass transfers. If, up the hubs, you feel that the kart 'looks up too much the inner rear wheel and' jump 'in the cornering medium, it is because your rear train has become too rigid. My Pro Council: In this case, before changing hubs, first try to slightly reduce your rear path by returning the hubs of a few millimeters inward. It is often more effective than ironing over 40 or 55 mm, because you keep stiffness of 85 mm while relaxing global geometry. "

❓ FAQ SEO (Frequently Asked Questions)

Q: What is the difference between gold aluminum and magnesium ?

A: Gold aluminum (anodized) is more durable, less subject to oxidation and cheaper than magnesium. Magnesium is privileged for its weight gain and thermal dissipation capacity, but it is more fragile and more complex to maintain.

Q: Can I mount these hubs on a axle of 30 or 40 mm ?

A: No, this hub is specifically machined for axle of 50 mm. The inner diameter is a precision dimension, it does not tolerate adaptation.

Q: Is the R2.0 version really different from the old models ?

A: Yes, the R2.0 series at CRG incorporates improvements on the accuracy of the goujon machining and the quality of anodizing, providing a better life of the threads.

✅ Ready for the track ?

You now have precision equipment. To finalize your assembly:

• [Vérification de l'essieu] (Make sure it is perfectly right).

• [Goujons de rechange] (Indispensable with long hubs that are more cantilever).