Installation manual

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FRAME PREPARATION - PART 2

Ok, are you ready for the ﬁnal and most critical step in frame preparation?

Step 3:

Replace the bottom bracket facing cutter on your tool with the

Truvativ ISCG tab facing cutter that is appropriate for your size ISCG

tabs and remove all spacers from the cutter.

•IfyourISCGtabsareushwiththefaceofthebottombracket

shell (zero offset), you will only be facing the tabs to ensure they

are parallel to the bottom bracket shell face. Face the ISCG tabs

using the same method provided by the manufacturer of your

bottom bracket facing tool. If the cutter does not completely face

the surface of each tab, add a 0.5 mm spacer to the cutter tool and

face again. When you are ﬁnished facing, be sure the ISCG tab

surface is smooth and free from burrs and debris.

NOTE:

If you added a 0.5 mm spacer to the cutter, you now have a 0.5 mm

offset to your tabs. Write this number down, you will need it later.

•IfyourISCGtabsareoffsetinboardofthefaceofthebottom

bracket shell, you will need to determine that offset prior to facing

so you can space the cutter tool to match. Use the depth stick on

the caliper and measure the depth at all three tabs. Select the

largest of the three numbers and write it down, this is your offset.

Locate your offset in the chart below and select the spacer or

combination of spacers from those supplied with the Truvativ

ISCG cutter. The cutter comes with 0.5 mm, 1 mm, and 2 mm width

spacers, each marked with its width. For 68 mm width bottom

brackets, do not exceed 0.5 mm of cutter tool spacing. For 73 mm

and 83 mm width bottom brackets, do exceed 3.0 mm of cutter tool

spacing.

OFFSET (mm) ISCG CUTTER SPACER(S) REQUIRED*

0.0 None

0.1 - 0.5 0.5 mm

0.6 - 1.0 1.0 mm

1.1 - 1.5 1.5 mm

1.6 - 2.0 2.0 mm

2.1 - 2.5 2.5 mm

2.6 - 3.0 3.0 mm

†

*write this number down you will need it again later on

† maximum spacer value for 73 and 83 mm bottom brackets

Step 4:

Face the ISCG tabs using the same method provided by the

manufacturer of your bottom bracket facing tool. If the cutter does

not completely face the surface of each tab, add a 0.5 mm spacer

to the cutter tool and face again. Remember, do not exceed 3.0 mm

of spacers. When you are ﬁnished facing, be sure the ISCG tab

surface is smooth and free from burrs and debris.

IMPORTANT:

For 73 and 83 mm bottom brackets do not exceed 3.0 mm of spacers during facing. If you exceed 3.0 mm of spacers the resulting

offset will be too large and the custom HammerSchmidt mounting bolts will not have enough thread engagement with ISCG tabs to

safely mount HammerSchmidt.

Offset

Flush

FRAME PREPARATION