Original Piaggio NRG Gilera Runner Liberty 50 4T Moving Drive Half-Pulley – OEM CM101104
¥10,900
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Original Piaggio NRG Gilera Runner Liberty 50 4T Moving Drive Half-Pulley – OEM CM101104
¥10,900
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Code: CM101104
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Shipping notice: truck drivers' strike in Italy
Updated 19/10/2026
Since 16 October, truck drivers protesting against high diesel prices have been blocking roads and ports in Southern Italy (Campania, Calabria, Sicily, Puglia, Basilicata), and the protest could spread to the rest of the country. The strike affects all our shipments, in Italy and abroad: Poste Italiane is currently not collecting parcels, while BRT and DHL are collecting as usual but deliveries may be delayed in some areas.
- Italy we ship with BRT and DHL · possible delivery delays
- European Union for now we ship with DHL only · possible delays
- Non-EU countries (customs) shipments temporarily suspended: they will leave as soon as Poste Italiane resumes collections
We apologise for any inconvenience and thank you for your patience.
Shipping outside the European Union — duties payable by the recipient
This order ships outside the European Union and is subject to customs clearance in the destination country.
Export formalities and costs from Italy are on us and are already included in the price.
Import duties, taxes and clearance fees in the destination country are payable by the buyer. They are not included in the product price or the shipping cost, and we cannot calculate them: they are set by the customs authority of the destination country.
The carrier will not release the parcel until the recipient pays these charges. If the shipment is refused or the charges are left unpaid, the parcel is returned to us and shipping, return and any customs costs are deducted from the refund.
This order ships outside the European Union and is subject to customs clearance in the destination country.
Export formalities and costs from Italy are on us and are already included in the price.
Import duties, taxes and clearance fees in the destination country are payable by the buyer. They are not included in the product price or the shipping cost, and we cannot calculate them: they are set by the customs authority of the destination country.
The carrier will not release the parcel until the recipient pays these charges. If the shipment is refused or the charges are left unpaid, the parcel is returned to us and shipping, return and any customs costs are deducted from the refund.
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The original Piaggio CM101104 mobile drive half-pulley is the OEM replacement part for the variator assembly of Piaggio Group 50cc 4-stroke scooters, including Piaggio NRG, Gilera Runner, Piaggio Liberty 50 4T, and Vespa ET4 50. This component is the mobile half of the variator's drive pulley and works together with the fixed half-pulley to ensure the correct movement of the drive belt, adjusting the continuous variable transmission (CVT) ratio based on engine RPM.
✓ Strengths
- 100% original Piaggio spare part – same component installed at the factory
- OEM code CM101104 (replaces CM110304) – perfect interchangeability
- Extended compatibility – 50cc 4T Piaggio/Gilera group scooters
- Ensures optimal transmission – smooth and progressive CVT ratio
- Reduces vibrations and belt wear – factory-calibrated sliding surface
- Direct installation – no modifications needed to the variator
Technical specifications
| Brand | Piaggio |
| OEM Code | CM101104 |
| Replacement Code | CM110304 (PIACM110304) |
| Aftermarket Equivalent | RMS 100320020 |
| Type | Mobile drive half-pulley (variator) |
| Position | Variator – drive side (crankshaft) |
| Engine type | 50cc 4-stroke (Piaggio group) |
| Spare part type | Original Piaggio (OEM) |
| Quantity | 1 piece |
⚠️ Important notes:
• The mobile drive half-pulley is a variator component that should be replaced when it shows wear, scratches, or excessive play on the belt's sliding surface.
• For a complete overhaul, it is recommended to simultaneously replace: variator rollers, drive belt, and counter spring (if worn).
• Installation requires removing the transmission cover; if you are not experienced, consult a qualified mechanic.
• Always verify compatibility with the VIN (Vehicle Identification Number) before purchasing.
• The mobile drive half-pulley is a variator component that should be replaced when it shows wear, scratches, or excessive play on the belt's sliding surface.
• For a complete overhaul, it is recommended to simultaneously replace: variator rollers, drive belt, and counter spring (if worn).
• Installation requires removing the transmission cover; if you are not experienced, consult a qualified mechanic.
• Always verify compatibility with the VIN (Vehicle Identification Number) before purchasing.
Vehicle compatibility
| Brand | Model | Displacement | Years |
|---|---|---|---|
| Piaggio | NRG MC3 / Power | 50cc | ⚠️ Verify with VIN |
| Piaggio | Liberty 4T | 50cc | 2000 – 2002 |
| Piaggio | Vespa ET4 | 50cc | 2000 – 2005 |
| Gilera | Runner 4T | 50cc | ⚠️ Verify with VIN |
| Gilera | DNA GP Experience | 50cc | 2003 – 2004 |
⚠️ Full year-by-year compatibility has not been officially declared by Piaggio for this code. It is recommended to verify using your VIN or the exploded parts catalog for your vehicle.
Recommended complementary parts
- Original Piaggio fixed drive half-pulley – replace if it shows wear on the contact surface with the belt
- Original Piaggio variator roller kit – to be replaced periodically to maintain performance
- Original Piaggio drive belt – replace if cracked, stretched, or worn
- Variator counter spring – if it loses elasticity over time
- Engine oil – replace after variator maintenance to remove residue
Who is it perfect for
The Piaggio CM101104 mobile drive half-pulley is the ideal replacement part for anyone who owns a Piaggio group 50cc 4-stroke scooter (NRG, Runner, Liberty, Vespa ET4) and wants to restore the optimal function of the CVT transmission with an original factory part. Indicated in case of jerking during acceleration, loss of top speed, abnormal noise from the cover, or visible wear on the belt's sliding surface.
🛡️ Guarantee and quality – Moon Bike S.r.l.
Moon Bike S.r.l. is an official Piaggio Group dealer based in Cercola (NA). The CM101104 half-pulley is an original Piaggio spare part supplied with full OEM traceability and covered by the manufacturer's official warranty. We ship throughout Italy and abroad with professional packaging.
Moon Bike S.r.l. is an official Piaggio Group dealer based in Cercola (NA). The CM101104 half-pulley is an original Piaggio spare part supplied with full OEM traceability and covered by the manufacturer's official warranty. We ship throughout Italy and abroad with professional packaging.
Compatible vehicles
- Piaggio Liberty 50 (2025)
- Piaggio Vespa ET4 50 2000-2005
Not sure it fits? Contact us
Frequently asked questions
Shipping times +
Shipping within 24-48 working hours in Italy. Tracking via SMS/email. Free pickup at our store in Cercola (NA), ready within 1 hour.
Returns and refunds +
You have 14 days from delivery to return the item without giving a reason. Free returns for faulty items. Full details
Payment methods +
Credit cards (Visa, Mastercard, American Express), PayPal, Apple Pay, Google Pay, Shop Pay, Klarna (pay in 3) and cash on delivery.
Warranty and authenticity +
All products come with a 24-month legal warranty. We are an Official Piaggio Group Dealer: original spare parts are certified with a verifiable OEM code.
Technical support +
Our technical team is available on WhatsApp +39 392 456 1248 Mon-Fri 9:00–13:30 / 14:30–18:00 (Italian time), or by email.