Chain roller with ball bearings.
This chain roller is made with two closed ball bearings, which extends the service life significantly. The chain roller can be used on many models, such as Aprilia SX50, Derbi Senda and others. The chain roller is universal and can be used for many other models than the models it is specified for - e.g. china crossers etc.
Check the dimensions of your current chain roller to compare with this one before you buy.
Bolt hole: 8 mm.
Width: 25 mm.
Height: 35 mm.