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Summary: Why the 75mm ?
In karting, switching from a standard hub (40 mm) to a longer hub (75 mm) is a common technique for adjusting geometry. The 75 mm allows:
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Raise the back path without adding spacers (the hub itself makes the wheel bears later).
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Increase side rigidity: The lever arm being longer, it exerts a more direct stress on the axle, which helps to load the outer rear wheel in turn further.
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Improve motor skills: This is the ideal setting if you feel that your kart is missing "grip" out of curve.
- Technical specifications
| Feature | Specification |
| Mark | CRG (Genuine Parts) |
| Inner diameter (axle) | 30 mm |
| Total length | 75 mm |
| Material | Aluminum CNC Aeronautics |
| Finishing | Black Anodized (High Resistance) |
| Configuration | Complete (with 3 mounting studs) |
| Use | Competition, improvement of the rear grip |
-Tuto editing: Expert precautions
The 75 mm being longer, it is more sensitive to bad manipulations. Follow these steps for perfect mounting:
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Preparation: Clean your axle perfectly (degreaser + cloth) to remove any trace of oxidation or dried grease.
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Positioning: Slide the hub. If the resistance is strong, check the absence of burrs on the axle or the key. Never force.
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Tightening (crucial): With a 75 mm hub, cantilever is important.
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Tighten the bolts alternately to distribute the pressure.
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Do not block too hard: the screws must be firm, but an excess clamping can deform the 75mm hub, which will create vibrations or make the future disassembly very difficult.
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Symmetry: Make sure the hub / chassis distance is identical to the left and right. An asymmetrical adjustment will make the behavior of predictable and dangerous kart.
💡 Michel's trick
"The 75 mm hub is the fatal weapon when we lack traction. The trick: If you mount 75 mm hubs, your rear train will become more rigid. If, after the assembly, you feel that the kart 'jumps' in turn (rebound phenomenon) is that your rear train has become too rigid for the adhesion of the day. My Pro Council: In this case, do not disassemble everything! First, try to slightly reduce the rear lane width by returning a little hubs inward. It is often more effective than ironing on 40 mm hubs. "
❓ FAQ SEO (Frequently Asked Questions)
Q: Can a 75 mm hub damage my axle ?
A: The 75 mm hub is more force on a longer area of the axle. Make sure you do not exceed the channel width limits allowed by your category's technical regulation to avoid creating an excessive leverage that could weaken the long-term axle.
Q: Do I change my wheel nuts with this hub ?
A: No, the wheel nuts depend on your rims, not the hub. However, always check that the hub studs (included) are screwed before mounting the rim.
✅ Ready for the track ?
You now have the necessary parts to adjust your chassis behavior. For a sustainable installation, consider:
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[Nettoyant frein] (The best friend of the mechanic to prepare the covers).
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[Goujons de rechange] (Because a threaded stud is a pre-grid galley).
FMN.00735
Specific References
In karting, switching from a standard hub (40 mm) to a longer hub (75 mm) is a common technique for adjusting geometry. The 75 mm allows:
-
Raise the back path Without adding spacers (the hub itself makes the wheel bears later).
-
Increase side rigidity: The lever arm being longer, it exerts a more direct stress on the axle, which helps to load the outer rear wheel in turn further.
-
Improve motor skills: This is the ideal setting if you feel that your kart is missing "grip" out of curve.