Cheap and durable, even for Grom
Chain of 420 Size has been adopted for many car models mainly on mopeds, and Grom is also 420.
However, because it is too narrow for Torque of 125 CC, it will extend as soon as neglecting Maintenance.
When exchanging, we recommend exchanging Enhanced Version 420SR instead of 420.
SR is Chain's width itself is a wide Enhanced Version.
In my case, I exchanged Chain itself at 2500 km, and the new and old Quantity : I use 2pc's Chains alternately. Why do such a thing? If you dip a dirty Chain in Oil and leave it overnight, the dirt on the Large side fell pretty just by brushing with the tooth Brush. After that, hang Oil-covered Chain one day, drop extra Oil, then wrap it in a newspaper and put it for several days. Then, finally wipe off the surface Oil in Dustcloth and keep it until the next use. It will take several days for such Maintenance,
So, Quantity : Use 2pc alternately.
420SR is also cheap. While Chain did not grow, Quantity : We recommend buying 2pc eyes and using it alternately. Drive chain, Sprocket life span dramatically increases.