The EX cog should only be used with a new, or nearly new drivetrain. Your chain and cassette should show no wear prior to install. Worn components will affect shifting performance.

For Shimano 10sp drivetrains it is vital that your chain is installed correctly for good shifting performance. Refer to your Shimano chain users manual for more information.

For 1x use, a mid cage or longer derailleur must be used

For 2x use a long cage derailleur must be used

Do not use with a 3x system

Always refer to your drivetrain manufacturer's recommendations on chain wrap

Start by installing the EX cog onto your freehub body

The side with the logos should be down towards the hub

Install your cassette

To fit the EX cog, one of the cassette cogs will need to be left out

If using the 40t EX cog, leave out the 15t cog and spacer

If using the 42t EX cog, leave out the 17t cog and spacer

Continue installing the cassette cogs, be sure each cog is facing the correct direction, refer to your cassette owners manual for more information

Lightly grease and install the cassette lockring and torque to spec.

Install the wheel back on the bike

Check shifting quality by shifting through the higher gears (smaller cogs)

If your cassette is not shifting properly, adjust the derailleur using only the smaller cogs.

If you are unsure how to adjust your rear derailleur, consult your derailleur owners manual or visit your local bike shop

You should have perfect shifting in these smaller cogs before adjusting shifting into the EX cog.

Shift into the EX cog

Adjust the B-limit screw so that there is a 5-6mm gap between the upper derailleur pulley teeth and the teeth on the EX cog

If you are unsure how to adjust your B-limit screw, consult your derailleur owners manual or visit your local bike shop

You can also hear when the B-limit is not adjusted correctly as the teeth will grind together. Adjust the B-limit screw in until quiet

For the 42t cog, you will likely need to install the provided longer B-limit screw

Simply remove the stock B-limit screw and install the new one

Be careful not to lose the small plastic washer

If it comes out be sure to re-install it

Check your shifting and go ride!