Basic Introduction

The content of the article contains the working principle and some related terminologies. Most importantly, it answers the most commonly asked question: how to choose the weight? Be sure to read this one if you are new to scooter tuning.

Sliding Roller Weight-
     also known as Weight Slider, Slider, Slider Weight, etc.

Description

Sliding Roller Weight

The choices you make,
make you

feature of Sliding Roller weight-Dr.Pulley

Still struggling choosing initial acceleration or higher top end when tuning your vehicle?
Well, why choosing one over the other?
Now you can have both, with Dr.Pulley patented sliding roller weight (SR).

Here we need to talk about something technical.

There are two crucial factors that make a SR work: Dimension and Material.

First, the calculated design makes SR startup with more power, so you get greater acceleration.
And then the design is able to open the variator wider, push the belt out further, and get you to a higher top end speed.

Next, and yet the most important, produce SR with our special formulated material.  The key to ensure
– faster movement (low friction coefficient),
– better wear resistant (bearing grade material), and
– more protection to your variator (non-abrasive fiber)
is in your hands.

Now, combine these two magical factors, and we have the sliding roller weight created and handed to you.

In short, the fastest way to improve your vehicle performance is right here.
What are you waiting for?

Benefits

Material

Dr.Pulley SR , Sliding Roller Weight, is made of proprietary self-lubricated composite (formulated by Union Material Co., Ltd.) It’s the bearing grade material in the industry, with the benifits of :

  • Low Friction Coeffcient
  • High Wear Resistance
  • High Service Temperature
  • Do not attack Non-ferrous Metal (ex.Aluminum)

Design

In Sliding Roller Weight there are several fabulous designs. For instance, it has a larger contact area with the plane ramp of the Ramp Plate, which makes the SR more durable during the movement between the Ramp Plate and the variator (or, moveable drive face, MDF). Compared to the diameter of traditional round roller weight, SR has a narrower horizontal dimension, which makes the centroid of roller closer to the edge of the variator, and therefore makes the variator open wider to reach higher top end speed. More benefits are as the following:

Patent

Sliding roller weight, US Patent No. 7,276,004 B2.

Field Test

Test#1 Acceleration Rate

To Compare the accelerate performance between the Conventional Roller weight and the Sliding Roller weight of Dr.Pulley.

Condition

  1. Scooter model : KYMCO GY6 125 c.c.
  2. Rider weight : 100 kg (220 lb).
  3. Weight Roller : 18×14, 13 gram.

Method

There are three test cycles. We record the time of each cycle.

  • Test cycle #1:
    • 0 ~ 100 km/hr, with throttle fully open.
  • Test cycle #2 :
    • Fully open throttle to reach speed of 80 km/hr.
    • Close throttle ’til speed drops to 60 km/hr.
    • Fully open throttle again to reach speed of 80 km/hr.
  • Test cycle #3 :
    • Fully open throttle to reach speed of 80 km/hr.
    • Close throttle ’til speed drops to 70 km/hr.
    • Fully open throttle again to reach speed of 80 km/hr.

What did it record?

This field test recorded the time needed to complete each cycle, High and Low gear ratios, and the speed at High gear ratio

Conclusion

The test result is shown in the following table and infographic. From the result, we can see that the scooter with Dr.Pulley Sliding roller weight is “Faster” than that with traditional Round roller weight in all conditions.

Test #2 Wear loss

To compare the wear loss of three different brands of rollers, including Dr.Pulley, M-brand and V-brand.

Condition

  • Normal load: 40 kilogram on the roller weight.
  • Test environmental temperature: 90 ℃.
  • Counterpart : Curved ramp of variatorof 250 c.c. scooter, ADC 12.
  • The specification of Weight Rollers in the wear test : Φ20 x H17.

Method

We proceed reciprocation movement of the roller weights on the curved ramp, and record the changes on their weights and dimensions after whole test cycle.
Total Cycles of test duration: 300,000 cycles. (1 cycle = 1 up-and-down movement)

What do it record?

  1. Weight loss of Roller Weight (g).
  2. Weight loss of counterpart (variator) (g).
  3. Radial wear of Roller Weight (mm).
  4. Surface Roughness of counter part.

Conclusion

The test result shows that, Dr.Pulley roller weight has the minimum wear loss among all three brands, in terms of the wear loss of both the roller weight itself and the aluminum counterpart. This means, Dr.Pulley roller weight performs the best durability, and gives the aluminum variator the best protection.

How to correctly place the Sliding Roller Weights

To avoid wrongly placing the Sliding roller weight which can result in reduced service life, we provide two kinds of methods for your reference.

Setting Direction of Weight Rollers ➔ https://drpulley.co/setting-direction-of-weight-rollers/

Method #1

The Stopping side of the Roller Weight is placed in an anti-clockwise direction into the curved ramp of the variator

install-in-a-anti-clockwise-direction

Method #2 (only for Sliding Roller)

See this setup figure below to put the Sliding Roller Weight into your variator. Once your put the Sliding Roller Weight in the correct orientation, from the sideview you will see “Dr.Pulley” on the upper and the size number on the lower side.

Install for SR - Dr.Pulley

The Color of Sliding Roller Weight

Currently there are two colors for you to choose: one is original color (named “Classic” ) and the other is black color (named “Euro”).

Sliding Roller Weight 26x13W-8, SR2613W-8
Type: Classic
Sliding Roller Weight 26x13W-8, SR2613W-8
Type: Euro

What does the product number mean?

We always use numbers to represent the size of a roller weight. For example, for traditional round roller weight, you may see 1512, 1613, 2012, etc. The first two digits represent the diameter of the circle side, and the later represent the height of the roller weight.

So, for example, in RR1512, 15 means its 15mm diameter, and 12 means its 12mm height. As for Sliding Roller Weight, say, SR1512, it shows it’s an equivalent Sliding roller weight to replace round roller weight RR1512.

There are a total of 7 or 8 characters in the product number.

  • The 1 st to 2nd digit : an abbreviation of Sliding Roller weight.
  • The 3rd to 4th digit : an equivalent outer diameter to the outer diameter of Round Roller weight
  • The 5th to 6th digit : the height of the Sliding Roller weight
  • The 7th digit (optional) : special version (special design) compared to the original design
  • The 8th digit: the number of pieces in a set of roller weight

The following diagram shows how to read the product number.

Product-spec.-sliding-roller-weight-dr.pulley

Product Specifications

The following shows all current product specifications of Sliding Roller Weight listed on the E-shop. There are 34 kinds of size specifications for you to choose for your scooter, ATV, or UTV. More products will be updated here.

If, in any case, that you cannot find the size or weight for the roller weight you are looking for, they may
be just on the way to the website. Please don’t hesitate to contact us and we will figure it out for you.

How to choose the right weight for roller weights ➔ https://drpulley.co/how-to-choose-the-right-weight-for-roller-weights/