Ball bearing -MALOSSI 6205 ETN9C4- (25x52x15mm)- used for engine housing Malossi VR-One (installation location crankshaft alternator side)- Vespa PX

Malossi VR-One ball bearings with TN9 polyamide cage

The Malossi VR-One engine cases rely on a larger bearing dimension on the limaside than the standard engines - identical to the factory-reinforced bearings of the Vespa Rally 200 and SS180. In contrast to the heavy roller bearings fitted as standard, Malossi uses lightweight ball bearings with a TN9 polyamide cage. This modern choice of bearing offers numerous advantages - especially for tuned engines with high engine speeds.

Advantages of the TN9 polyamide cages

✅ Low weight: Reduces centrifugal forces at high speeds - less wear

✅ High strength: resilient even during sporty use

✅ Good wear resistance: Durable even with intensive use

✅ Shock-absorbing: polyamide absorbs vibrations better than metal

✅ Corrosion resistant: Rust-free use even in damp conditions

✅ Higher speeds: Higher limit speeds than metal cages

✅ More safety in the event of damage: Polyamide cage causes less damage than metal cages in the event of breakage

What to look out for?

Even though polyamide cages offer many advantages, there are technical conditions that should be taken into account:

• Limited temperature resistance: polyamide can deform at temperatures above 120 °C - therefore heat carefully during assembly.
• Limits under extreme loads: Under extreme loads, the cage can reach its mechanical limits. Therefore, be more careful during assembly than with bearings with a metal cage.

Conclusion

The use of TN9 polyamide cage ball bearings in the Malossi VR-One housings is a well thought-out further development compared to classic roller bearings. They offer a balanced combination of high performance, low weight and robustness suitable for everyday use - especially for ambitious tuning setups in the sporty Vespa sector.