Installation manual

The HammerSchmidt bottom bracket needs to be installed in a

speciﬁc order:

A. Thread the drive side bottom bracket assembly into your

frame using the Truvativ ISIS (or equivalent) bottom bracket

installation tool. The drive side assembly is left-hand threaded,

so turn it counter-clockwise to install and torque to 34-41 N·m

(301-363 in-lb).

B. (not pictured)

Install the non-drive side bottom bracket assembly using the

Truvativ GXP (or equivalent) bottom bracket installation tool.

The non-drive side assembly is right-hand threaded, so turn it

clockwise to install and torque to 34-41 N·m (301-363 in-lb).

C H A I N R I N G R E P L A C E M E N T –

OPTIONAL

If you want to change your chainring size, now is a convenient

time to do it. Locate the retaining ring on the HammerSchmidt

mechanism crank arm and use a ﬂathead screwdriver to gently

pry the retaining ring off the ring guide. Remove the ring guide

and chainring. Install your other chainring. Re-install the ring

guide and carefully press on the retaining ring using the

ﬂathead screwdriver. Make sure the retaining ring is fully

seated in the groove of the ring guide by rotating it a couple of

revolutions.

C O L L A R P L A T E A S S E M B L Y

INSTALLATION

Check that the seal disk for your frame’s ISCG standard

(ISCG 03 or ISCG 05) is installed. If you need to change out the

seal disk, use a 4 mm hex to remove the cable anchor bolt and

a 2 mm hex to remove the seal disk retaining bolt then switch

seal disks. Make sure the recess on the seal disk anchor bolt

window faces down. Re-install the cable anchor bolt until it is

hand tight. Re-install the seal disk retaining bolt and torque to

0.5 N·m (4 in-lb).

34-41 N·m (301-363 in-lb)

INSTALLATION