Item Descriptions: -This bicycle pedal assist sensor disk is equipped with 12 magnets, with a diameter of 65mm and an aperture of 15mm. -The sensor disk is compatible with Green 7.7, Z801, Z802, and ZT20R electric bicycles. -Made of Alloy, plastic, magnet material, durable and long-lasting. -As long as the inner ring of the auxiliary sensor is clamped on the intermediate shaft and the housing is fixed on the frame, there is no need to disassemble the intermediate shaft, making installation convenient, stable, and reliable. -Easy to install: It is more labor-saving, easy to ride, small in size, and lightweight. Suitable for most electric bicycles. Package: 1x/2x Bicycle Pedal Sensor Disk Item Specifications: Bicycle type:Electric bicycle Materials:Alloy, plastic, magnet Diameter:65mm Aperture:15mm Number of magnets:12 magnets Colour:Black

JoAnn Nisleit (comprador verificado) –
Excellent solution
Worked great, much easier to install than original equipment for my bike. I did have to remove every other magnet since my original had just 6 magnets.When I installed it my bike did not work correctly, found I had to remove and flip it over. Thought it should work either way as the magnet just has to pass the sensor but forgot magnets are polarized!
P Glendinning (comprador verificado) –
Good but I bought the wrong size
Its fine but it wasn’t clear about the size and I may have bought the wrong size