175
PART 3
STEP 7. Installing Brake Disc to Wheel Hub
Assembling Your Bike
GT Bicycle Owner’s Manual
Center Lock or Spline type:
Find the disc brake rotor, retaining lock ring, and remove all packaging materials. Look at the rotor and
note an internal splined interface. Look at the front wheel and note that one side of the hub has an
external splined interface.
Set the disc brake rotor over these splines. Carefully note and follow directional markings on the disc
brake rotor. Markings will face out. Find the retaining lock ring and by hand carefully thread it onto the
threads in the hub.
Next you will need the correct tool to tighten this retaining lock ring. There are two common designs: (a)
internally driven lock rings use a 12 spline tool also used for cassette lockrings, e.g. the Park FR-5.2 (b)
externally driven lock rings use a 16 notch tool also used for bottom bracket installation, e.g. the Park
BBT-69.2 or BBT-9. Carefully check the fit between the tool and the lock ring. Once sure you have the
correct tool correctly fitted to the lock ring, use a torque wrench to tighten this retaining lock ring to the
specified torque. If you use a large adjustable wrench, make these are very tight. You will feel the
retaining lock ring click or bump over a series of locking features as you do so. This is normal and
indicates you are engaging these locking features.
All types:
Be sure there is no grease or oil, even from your hands, on the rotor. Clean the braking surfaces of the
rotor with isopropyl alcohol.
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