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Ref : POL00393A / 1127779
Polini

Polini Half Pulley

Recommended retail price: 64,78 €58,30 €

Compatibility

Check that this part fits your motorcycle

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Features

POLINI Half-Pulley 14° (manufacturer reference 244.0131) — a specific solution for prepared urban scooters, the Polini Evolution Air Speed self-ventilated half-pulley is designed for Polini Evolution engine casings and tuned Piaggio engines. Made from anodized aluminum alloy with a diameter of 115 mm, it features inverted blades with an aerodynamic profile that optimize airflow within the transmission.

  • Inclination angle: 14° (dedicated version for precise transmission behavior)
  • Material: anodized aluminum alloy, durable finish
  • Diameter: 115 mm for improved airflow
  • Design: self-ventilated inverted blades to optimize transmission cooling
  • Effects reported by Polini: approximately 30% increase in airflow at high RPMs (13,000–15,000 RPM) and about 5% reduction in power absorbed by the crankshaft

Ideal for urban riders looking to enhance reliability and improve transmission ventilation on prepared setups, this half-pulley naturally fits models such as the Aprilia SR 50 R (2022), the Piaggio Typhoon 50 E4 (2020), or certain Vespa LX 4T (2013). Please check compatibility with your casing before installation.