Remove the wheel from the bike and remove the lockring by hand.

Fitting Take care when replacing the cogset that all cogs are fitted with the wide spline engaging the corresponding groove in the freehubbody. It is very easy to disturb the position of the endcog when tightening the lockring, and this could seriously damage the freehub. With the lockring handtight, the cogs shouldn't wobble when spinning the freehub.

To properly tighten the lockring, put the wheel back into the frame. Gently (the wheel is a large lever) rotate the wheel backwards to tighten the lockring. If you start with the lockring handtight, 10' (45º-60º) is sufficient.

Remove the NBT2 , and replace the QR (the smallest diameter of the conical spring goes against the axle).

Check the rear brake.