20T sprocket for Nexus geared hubs - suitable for the Brompton G line

20T sprocket for Nexus geared hubs - suitable for the Brompton G line

This is a 3 spline 20 tooth sprocket which is compatible with Nexus hubs, it is also compatible with the Brompton G line (manual not electric) 

To remove the rear wheel:

• Ensure the bike is in the highest gear, 8
• Push the tab washer clockwise to disengage the gear cable, then pull the gear cable to disconnect it from the cable slip 
• Undo the chain catcher arm using a 2mm Allen key, pull it upwards 
• Remove the chain from the chain ring to give some slack 
• Undo the wheel nuts using a 15mm spanner 
• Remove the tab washers and the bolts from the axle - keep them safe 
• Remove the wheel from the dropouts and take the chain off the sprocket 
• Do Not squeeze the brake lever while the wheel is out, as tis will cause the brake pads to touch 
• Remove the sprocket by taking the circle off using a flat head screw driver 

Fitting the rear wheel:

• Install the new sprocket 
• Secure using he circlip 
• Rotate the assembly until the cable bracket is parallel with the drive side chain stay 
• Loop the chain around the sprocket 
• insert the wheel fully in the drop outs 
• Make sure the disc rotor is in teh brake pads 
• Insert the tape washers with the white one on the non-drive side 
• Using the 15mm spanner tighten the drive side first 
• Then using the torque wrench tighten both side to 30Nm 
• Refit the chain n the chain ring and then re-install the chain catcher 
• Push the gear cable into the cable clip then rotate the assembly clip 
• Push the flat slide of the cable nut in the slot 
• There should be no reason to index the gears, just check they are working properly