With this Motorized Bicycle Idler Pulley Roller Wheel, you'll experience a smoother rider than ever before. This pulley wheel makes sure your 415 chain rolls smoother than other all-nylon idler pullies that come with most engine kits. This is because of the pre-installed Z809 ball bearing.
The Z809 bearing inside this idler pulley wheel offers two benefits. First is the smooth roll you can only achieve with ball bearings, leaps, and bounds smoother than basic rollers. The second would be longevity, as the ball bearing keeps the wheel from wearing down from the center like other rollers. When you're ready to stop your chain from kinking due to an unsmooth roller, this Idler Pulley Roller Wheel is just what you need.
I required two bearings for my exercise bike. I thought that these bearings were correct. They were not. My mistake.
Yes, chain is smoother....
Just what I needed.
good stuff. Very smooth