Summary: The "large format" lever

With its 125 mm long, This hub is designed for configurations requiring significant wheel offset or increased rear train rigidity.

• The axle 40 mm: Standard on some club chassis or specific categories, it requires hubs suitable for this diameter.

• The length 125 mm: It's a "long" hub. It offers colossal support. It is ideal if you need to load the rear axle for more moving output or to expand the track without spacers.

- Technical specifications

- Mounting tuto: the tightening "2 screws"

The mounting of a 125 mm hub with two screws requires special attention to not create a stress point on the axle.

1. Absolute cleaning: The 40 mm axle must be clean. Use an effective degreaser. Any trace of grease will slide the hub during large accelerations.

2. Positioning: Drag the hub to the axle to the desired position.

3. Tightening procedure (important):

   • Insert both screws.

   • Tighten the screws alternately: Start with the first screw, tighten a little, go to the second, tighten a little. Make several passages up to the final torque.

   • Why ? With 2 screws, if you tighten a bottom with the other, you may deform the hub slot and make it less effective on its maintenance.

4. Verification: Once tight, try to move the hub by hand. There must be no rotation or axial game.

💡 Michel's trick

"The 125 mm is a strong choice. The trick: A long hub creates a huge lever arm on your axle. If you feel that your Kart is brutally picking up in the backpack, it is often because the 125 mm hub rigids too much the back. My Pro Council: If you mount these hubs, check the status of your axle every two rolling days. A 125 mm hub that has undergone a lateral shock can mark the axle deeper than a short hub. If you see a deep brand on the axle, change it, because the crack can progress with metal fatigue. "

❓ FAQ SEO (Frequently Asked Questions)

Q: Why 2 screws instead of one ?

A: The 40 mm diameter is more important than the 30 mm. To ensure that the hub does not turn on the axle under the motor torque, 2 screws make it possible to distribute the clamping force on a larger surface of the clamping ring.

Q: Can we use these hubs on a 50 mm axle ?

A: No, absolutely not. The rating is fixed. A 40x125 hub will never be mounted on a 50 mm axle. You must respect the inside diameter of the axle.

Q: Do the 125 mm make the kart harder to fly ?

A: No harder, but the behavior changes. It increases the "grip". If the track already has a lot of adhesion, this can make the kart difficult to rotate in tight turns. If the track lacks adhesion is an excellent weapon.

✅ Ready for assembly ?

You have in the hands a powerful adjustment component. To ensure the safety of your assembly:

• Always check your studs: With a hub as long, the constraints on rim studs are higher.

• Brake cleaner: Indispensable to ensure that the hub does not slide on the axle.