Jab Cage Installation Guide

Clean the derailleur.

This will prevent grit from getting in during the rebuild, and make it easier to notice parts that need service.

Set the cage in the locked position with a tool (such as 4mm hex key or T25 torx).

Remove the M4 socket head cage stop screw (it’s near the cage lock hole).

Hold the cage and derailleur securely, then remove the cage lock tool.

Slowly let the cage unwind the preload.

Remove the M5 flat head screw.

Remove the cage and other parts:

• Cage
• O-ring
• Stainless steel star shaped part.
• Dark grey plastic ring that fits into the star shaped part.

You can leave the 0.5mm thick shim next to the exposed bearing.

Note: Newer cages do not have the above parts, so you will not need them.

Torsion Spring

If you pull the torsion spring out, just make sure it has no grit, and plenty of grease (we recommend marine grease) when it goes back in.

One of the ends of the spring may have a straighter section of wire near the 90 degree tip. This end goes into the clutch housing (not the cage). This end may have a red dot on it.

Make sure that tip of the spring is fully seated in the hole on the inside of the clutch housing.

Re-Assembly

The installation order of parts is:

0.5mm thick shim over the bearing.

Stainless steel star and plastic ring:

Fits over the square shape on the spindle.

Dark grey plastic ring is installed in the star shaped part, with the ring inside the housing (not facing outside).

Tip of torsion spring through the slot.

Reminder, newer cages do not have the above small parts so you will not need them.

No need to install the o ring yet.

Apply blue Loctite to the M5 flat head screw so its ready for you.

On the outer cage plate, locate the middle of 3 holes for the tip of the spring.

Hold the stainless steel star down so the square shape is engaged with the spindle with your finger tips.

Place the tip of the spring into the middle of 3 holes on the cage.

Note: Newer cages only have 1 hole.

Hold the cage and derailleur so it keeps the stack compressed, and the square shapes are engaged with one hand.

Thread in the M5 flat head screw.

Make sure the square shapes are engaged.

Make sure the spring tip is in the middle hole.

Check to make sure the gap between the cage and the housing is parallel (where the o ring goes).

If it does not line up properly, go back a few steps and start over again. The key to this is getting used to holding the derailleur and cage in place with 1 hand.

Gently stretch the o ring over the cage (don’t stretch it too far) and get it in the groove.

To minimize the o-ring stretch, make sure the upper pulley is removed.

Have a cage lock tool ready.

Carefully wind preload into the cage by rotating it counter clockwise about 1.5 rotations.

Set the cage lock with a tool.

Apply blue Loctite to the M4 socket head screw, and thread it into the hole on the cage.

Apply grease liberally to all 4 bearing seals (of 2 pulleys), then install the dust shields.

Wipe off all excess grease from the pulleys, including the inside hole through the center of the bearings.

CNC Machined Pulleys:

• The pulleys look identical but there is one important difference if you look closely.
• Inspect the narrow/short teeth. One pulley will have chamfers on the teeth, and one will not have chamfers.
• The pulley without the chamfers is the TOP pulley.
• The pulley WITH the chamfers is the BOTTOM pulley.

Injection Molded Pulleys:

• Newer Jab derailleurs have 2 identical injection molded pulleys, so the location does not matter.

CNC machined pulleys:

Apply blue Loctite to the two M3 flat head screws (for the two cage spacers).

Apply blue Loctite to the two M4 flat head screws (for the two pulleys).

Install the lower pulley and upper cage spacer.

You can leave the upper pulley and lower cage spacer out, and install them after the the derailleur is on the bike and the chain is routed through the cage.

Re-install the derailleur. 

The installation and adjustment instructions are here.

Done!