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CVT Tuning Explained - Choosing The Right Weight Rollers


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Thanks to Bear's Garage for sharing this valuable information! With more and more scooters and auto transmission bikes on our roads today, this has become one of the most but also confusing modifications you can do on your motorcycle!

Credits and directly quoted from Bear's Garage - FB link here: https://www.facebook.com/bearsgaragesg/

CVT hoo-hahs: This episode we bring to you the most misunderstood concepts of CVT tuning. Rollers. 
Seen in these pictures, those purple colours candy-looking things are what we call roller weights. These rollers sit in specific grooves in the front part of the CVT sometimes called the variator(also called front pulley, housing, etc). These rollers act by centrifugal force, rolling and sliding along in their own grooves (2nd pic) and push the moving sheave of the variator in/out according to RPM. Picture 3 is the CVT at rest/standstill and picture 4 is the CVT at full throttle(For educational purposes, don't try this at home or anywhere else, the CVT is designed to be covered while in use).

Here comes the part: 6x10g rollers give a total weight of 60g, which is the same as 3x9g and 3x11g. So get a set of 10g rollers and don't waste your money on 2 sets of rollers(9 and 11g) when you want a total weight of 60g. 
Rollers are tuned by total weight, the lighter the rollers, the higher the RPM the bike will "hang" at wide open throttle. Generally, lighter rollers give you more initial acceleration but too high an RPM will result in over-revving and loss of power(rollers are generally tuned to the powerband of the bike, where the bike makes most power). 
Simply put, we look at the front part of the CVT as upshifting in a normal motorcycle with gears. Lighter weights means you drag through the gears and shift to the next at higher RPMs, heavier weight give you a smoother ride much like shifting at lower RPMs on a normal motorcycle with gears.

What rollers work best for a stock bike? There's no perfect solution for everyone and now you know how it works, it all depends on your preference right?

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