Start by making sure you are using the correct guide for your application: TRS dual ring guide picker

This how-to guide will cover the BB mount version of the guide

Remove your guide from the package

BB mount guides will include a 0.5mm BB spacer for alignment

Remove your cranks from the bike

Install the guide on the bike

Start with the 0.5mm BB spacer mounted between the chainguide and the frame

Remove the drive side BB cup and slide the guide and spacer over the BB

Clean any grease off of the mounting face of the guide and BB, this will help keep the guide from rotating on impact

Snug down the BB

Loosen the bolt on the lower slider and swing the lower slider open

Adjust the lower slider to the position that matches the size of your big chainring

This guide is set-up in the 38t position

Release the lower slider by lifting the tab on the back of the slider and pulling the bottom of the slider out

Adjust the slider, then clip it back onto the backplate, be sure the slider nut is properly aligned with the hole in the slider

Slide the cranks back into the drive side BB cup and close the lower slider

tighten the slider bolt to 0.5nm

Sight down the back of the bike and check the chainrings to make sure they are properly aligned with the lower roller

Move the 0.5mm spacer as needed to align the guide with the rings

Remove the cranks and tighten the BB to manufacturers torque spec

Reinstall the cranks per manufacturers recommendations

Check derailleur function and alignment before riding