Prima 16x13mm CVT Roller Weights - 139QMB Ruckus 50cc

$11.00

Weight per roller (g)

Part number ROLL16X13 4.0 G

Check dimensions and compatibility before ordering.

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Description

Make your scooter's power delivery suit the way you ride with the Prima 16x13mm CVT Roller Weight Set. Whether you're fine-tuning takeoff for city traffic or dialing in your favorite cruising setup, these precision-manufactured rollers let you adjust variator behavior without replacing the carburetor or exhaust. Each set includes six black cylindrical rollers with metal centers in your selected weight, made for smooth, consistent shifting and durability in high-heat CVT environments.

Features

CVT Tuning: Adjusts variator shifting behavior to suit your engine and riding goals.
Six-Piece Set: Six rollers of the selected weight per pack.
16x13mm Size: For variators requiring 16mm-diameter, 13mm-wide rollers.
14 Weight Options: Choose from 3g to 11g per roller.
Precision Manufacture: Exact-tolerance construction supports smooth, consistent shifting.
CVT Durability: Designed for high-heat transmission environments.

Specifications

Weight per roller (g)	4.0 G

Brand: Prima
Part-number family: ROLL16X13; variant SKU identifies selected weight
Diameter: 16mm
Width: 13mm
Quantity: Six rollers per set
Weight per roller: 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 9, 10 or 11g

Model Fitment

Make / platform	Applications
Genuine	Buddy 50 / International; RoughHouse 50 / Sport / Titanium; Rattler 50; Black Cat 50
Honda	Ruckus NPS50, all years; Metropolitan CHF50, 2002–2009
Yamaha	C3 XF50, 2007–2011; Vino 50 four-stroke; Zuma 50F / 50FX four-stroke, 2012+
Chicago Scooter Co.	Go. 50; Go. Max 50
Wolf	RX-50; Islander; Lucky; Blaze; MOTO
TaoTao / Tao Motors	ATM50-A1; Pony; VIP; Thunder
Lance / SYM	Cali Classic 50; PCH 50; Cabo 50
Kymco	Agility 50; Super 8 50 four-stroke
Bintelli / Ice Bear	Breeze; Havoc; Maddog 50; PMZ50
GY6 50 / QMA-QMB platforms	Compatible 49–80cc four-stroke configurations using 16x13mm rollers. Engine references: 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD and other 50cc QMA/QMB configurations.

Confirm that your installed variator uses 16x13mm rollers, especially if it has been replaced or upgraded. An engine code alone does not confirm roller size.

CVT Tuning Guide

Lighter rollers generally delay upshifting and let the engine run at higher RPM; heavier rollers generally promote earlier upshifting and lower RPM. The best weight depends on the engine's powerband, variator, belt, springs, and rider load. Too light or too heavy can hurt performance, and heavier weights do not guarantee more top speed.

Original-weight reference ranges for comparison: Buddy 50 / International, RoughHouse 50 / Sport / Titanium and Black Cat 50: 7.5–8.5g; Rattler 50: 11.5g. Check your actual setup before selecting a tuning weight.

Supplier product-family reference photos. Select the exact weight or jet size from the options; markings in a reference photo may show a different option.