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Supre Drive Tensioner Arm
1. Tensioner arm
  1.1 Tensioner arm bearing
  1.2 Retaining ring
  1.3 Dust shield
  1.4 Mounting spacer
2. Barrel
  2.1 Grub screw
3. Tensioner pulley
  3.1 Pulley spacers
  3.2 Bearing
  3.3 Pulley bolt
INSTALLATION
Installing the tensioner arm
- The Supre Drive Tensioner Arm is only compatible with Supre Drive specific frames and T47 bottom brackets.
- With the cranks removed and before the drive side bottom bracket cup is installed, push the tensioner arm with the mounting ring onto the outer face of the bottom bracket area.
- Ensure bottom bracket area and frame is clean before installing tensioner arm.
- Push the tensioner arm evenly onto the frame, make sure it is concentric with the bottom bracket axis and pushed all the way onto the frame.
- Install the dust shield before installing the drive side bottom bracket cup and cranks.
- Rotate the tensioner arm around ensuring it rotates freely.
Installing the cable
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- The Supre Drive Cartridge, Derailleur and chain need to be installed before continuing with this step.
- Route the cable through the hole in the tensioner arm and through the barrel. Then, clip the barrel onto the tensioner arm (this requires application of pressure to push the barrel into its seat).
- With your rear wheel installed and the drivetrain in the highest gear rotate the tensioner arm forward as far as possible, taking up all of the slack in the chain.
- Slide the barrel onto the tensioner cable.
- Put a small amount of grease on the threads of the grub screw in the barrel allowing better cable clamping without damaging the grub screw head.
- Do not get any grease on the cable, inside the barrel or on the tip of the grub screw as this can cause the cable to slip.
- Hold the barrel, tensioner cable and tensioner arm in position where there is no slack in the chain, mark the position of the barrel on the cable (for example, with a sharpie marker).
- Fasten the barrel 8mm closer to the cartridge than your mark. Torque the grub screw to 2 Nm
- Hold the back of the barrel with a 3mm hex key, and use a high quality hex-key when fastening the grub screw.
- It is important that the grub screw is fastened to the correct torque, if not it could slip on the cable significantly impacting the performance of the drivetrain.
- Using a pair of long-nose pliers, pull out the tensioner cable slightly from the cartridge and clip the barrel into the tensioner arm.
- Cut the cable >20mm from the barrel and install a ferrule.
- Cutting the cable too close to the barrel and not installing a ferrule can cause the barrel to slip on the cable.
SETUP/ADJUSTMENT
Adjust the cable tension
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- The cable tension is important to the Supre Drive shifting performance.
- If the derailleur struggles to shift out of the lowest gear, check that the cable tension is not too high and move the barrel out, away from the cartridge.
- If the chain is slack in the heaviest gear, check that the cable tension is not too low and move the barrel in, towards the cartridge.
- Small cable adjustments will make a big difference in chain tension. Keep barrel adjustments <5mm.
- Un-clip the barrel from the tensioner arm using a pair of long-nose pliers pulling on the tail of the cable.
- Un-do the grub screw, move the barrel in the appropriate direction and re-fasten the grub screw.
- Hold the barrel securely and use a high quality hex-key when fastening the grub screw.
- It is important that the grub screw is fastened to the correct torque, if not it could slip on the cable significantly impacting the performance of the drivetrain.
- Using a pair of long-nose pliers, pull out the tensioner cable slightly from the cartridge and clip the barrel into the tensioner arm.
Locking the tensioner arm
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- Rotate the tensioner arm back roughly a quarter of a rotation.
- With your other hand reach under the tensioner arm and pull down on the spring hook, release the tensioner arm slowly while holding the spring so that the spring slides over the barrel bolt.
- Locking the tensioner arm is useful when removing the rear wheel or working on the drivetrain.
- To release, rotate the tensioner arm back slightly until you hear the spring "click" off of the pin bolt.
MAINTENANCE
Replacing the tensioner pulley
- Remove the tensioner pulley bolt.
- Replace the relevant parts and re-install the pulley
- You should use a light thread-lock when re-installing the derailleur pulley bolt.
- The inner and outer pulley spacers are exactly the same and can be installed on either side of the pulley.
- The tensioner pulley can be installed in both directions.
Replacing the tensioner arm bearing
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- With the crankset and drive side bottom bracket removed, un-clip the barrel from the tensioner arm using a pair of long-nose pliers pulling on the tail of the cable.
- Pull the tensioner arm off of the bottom bracket shell.
- Pull the tensioner arm evenly all around the entire circumference. Make sure it is pulled off straight to avoid damage.
- Remove the dust shield and the retaining ring. The retaining ring can be removed by using a small flat head screwdriver and carefully prying the end of the retaining ring out.
- Use an oversized headset cup removal tool to carefully knock the bearing out of the tensioner arm.
- A heat gun can be used to carefully heat up the tensioner arm around the bearing to make it easier to knock out.
- Lightly grease the new bearing and press it into the clean tensioner arm.
- The bearing can be pressed in mostly by hand and fully using a bearing press or a vice. Be careful to press the bearing in straight and not crush the tensioner arm with bearing press or vice.
- Ensure the bearing is pushed in straight. If it is pushed at an angle it may damage the bearing seat or break the tensioner arm.
- Re-install the tensioner arm.