Installation manual

PARTS AND TOOLS NEEDED

• Safetyglasses

• HammerSchmidtframecompatibilitychecker

• 2,2.5,4,5,and8mmhexwrenches

• Flatheadscrewdriver

• Cablecutters

• Adjustabletorquewrenchupto54N·m(478in-lb)

• Digitalcalipers

• Bottombracketfacingtoolandcutter(ParkToolBFS-1or

similar

• HammerSchmidtISCGtabfacingcutter

• CuttingOil

• TruvativISISandGXPbottombracketinstallationtools

• Grease

FRAME COMPATIBILITY CHECK

HammerSchmidt is engineered to mount to frames with ISCG 03 or ISCG 05 chain guide mounting tabs and 68, 73,

or 83 mm bottom bracket shell widths. However, not all frames are made to the precision standards HammerSchmidt

requires. Therefore, before installing you will need to perform a simple frame compatibility check to determine if you can use

HammerSchmidt on your frame.

IMPORTANT:

It is critical to perform this check, otherwise you will experience complications with installation and/or function.

To check compatibility, use the enclosed HammerSchmidt frame compatibility checker tool. First, remove your old crank arms and

bottom bracket from your frame (if applicable). Next, thread the cup checker into the drive-side bottom bracket shell. Finally, slide

the pin checker over the cup checker and insert the pins into the ISCG tabs. The pin checker is double sided; one side has ISCG 03

pins, the other ISCG 05 pins. Be sure to insert the appropriate pins into the ISCG holes. For compatibility, the pins must go into the

ISCG holes, the cup checker must be centered in the pin checker and the arrow on the pin checker should point toward the rear

wheel axle. If the tool is difﬁcult to insert, won’t ﬁt at all, or the arrow doesn’t point toward the rear wheel axle, you cannot use

HammerSchmidt on your frame.

If you need additional help to determine the compatibility of HammerSchmidt you can visit www.magicmechanics.com or head

over to your local Truvativ dealer for assistance.

COMPONENT COMPATIBILITY CHECK

•BottomBracket-HammerSchmidtBBonly

•FrontShifter-HammerSchmidtX.0andX.9triggershiftersonly

•Chainrings-HammerSchmidt22or24tooth

•Chains-1x1,7,8,and9-speedSRAM®orShimano®chains

NON-COMPATIBILITY

Do not mount HammerSchmidt to an ISCG adapter device. ISCG adapters do not provide enough structural integrity to handle the

weight and loads applied by HammerSchmidt. ISCG adapters are only intended as a means to mount chain guide devices to non-

ISCG frames; make sure you keep it that way.

HAMMERSCHMIDT