I have been using this product for CYGNUS X for many years since the Normal engine days.
I have tried many Weight Rollers, from OEM Weight Rollers to DoctorPulley, and this product is the best overall.
First of all, there is no back and forth orientation, so there is no chance of accidental insertion.
Many Weight Rollers have a fixed orientation, and if you put them on in the opposite direction, the Pulley will be shaved.
The life of the roller is longer, and the outer diameter of the roller seems to be shaved off later than those of other companies. In particular, I have found that the cheap No Brand Weight Rollers have been shaved so hard that they sometimes turn into RoseRose inside, but this product has excellent durability.
Also, the bright brown color makes it easy to find even if it rolls around the garage. The bright brown color makes it easy to find as it rolls down the Garage. I like the color that stands out because the pure black Weight Roller is invisible in the shadows.
I use an electronic scale that can measure down to 1/100th of a meter, and there is almost no Rose variation when new, with an error of about 0.02.
If I had to say, I would be happy if the weight of the Weight Roller was written on the inner diameter so I don't have to measure it every time.
I am currently running the engine at more than 10,000 rpm with the engine bored up, and it has survived for one year without replacement.
View Detail