Shifter Replacement Guide

The shifter can be replaced in the unlikely event it is damaged or determined to be non-functional by Rad Power Bikes Product Support. Follow the steps below to replace the shifter on your bike. 

Note: Most of the photos below feature a 2019 RadRhino, but the steps will be the same for most models.

Tools Needed:

  • Flat head screwdriver
  • Phillips head screwdriver
  • Isopropyl alcohol
  • Paper towel
  • Flat side cutters
  • 3 mm Allen wrench
  • 5 mm Allen wrench
  • Torque wrench (with 3 mm, 5 mm Allen bits, and a flat head bit)
  • Cable cutters or needle nose pliers
  • Cable end crimps
  • Zip ties
  • The replacement shifter from Rad Power Bikes
Remove the Old Shifter
  1. Get the bike ready for maintenance. Turn off the bike, remove the battery, and press and hold MODE to discharge remaining power.
  2. Remove the handlebar grip.
    1. Remove the end cap. Use a flat head screwdriver to remove the grip end cap, and set it aside.

    2. Remove the grip. Carefully insert the screwdriver between the handlebar tubing and the grip and pry the grip away from the handlebar. Use a paper towel or squeeze bottle to apply a small amount of rubbing alcohol in between the grip and the handlebar as temporary lubrication. Twist and pull the grip off the handlebar end.

  3. Remove the twist power assist.
    1. Unplug the twist power assist connector. Trace the cable from the twist power assist to the connector. Snip the zip tie and pull the connector directly apart, without twisting, to unplug.

    2. Loosen the twist power assist clamp bolt. Use a 3 mm Allen wrench to loosen the twist power assist clamp bolt (1, below). If needed, use a 5 mm Allen wrench to loosen the brake lever clamp bolt (2, below) and move the brake lever out of the way.

      mceclip1.png   mceclip2.png
    3. Remove the spacer and then the twist power assist. Slide the spacer and twist power assist off the handlebar end, making note of the spacer orientation, which is critical for reinstallation.

      mceclip9.png   mceclip3.png
  4. Remove the brake lever. 
    1. Loosen the brake lever clamp bolt. Snip zip ties as needed and use a 5 mm Allen wrench to loosen the bolt.

    2. Rotate the handlebar to the left, unplug the brake connector if more slack is needed, and slide the brake lever off the handlebar. Set aside for reinstallation.

      If even more brake cable slack is needed, use a 5 mm Allen wrench to loosen (but not remove) the cable pinch bolt on the rear brake caliper and then slide the brake lever off the handlebar. 

      mceclip3.png   mceclip6.png
  5. Remove the shifter cable crimp. At the derailleur on the right side of the rear wheel, locate the shifter cable end cap. Use pliers to un-crimp and remove the cable crimp from the shifter end, and set aside.

    mceclip8.png   mceclip9.png
    Caution.png Cable ends are extremely sharp, especially if the cable has frayed. Use caution to avoid sharp and frayed cable ends or injury could occur. 
  6. Add shifter cable slack. Use a 5 mm Allen wrench to loosen the cable pinch bolt one turn at a time, just enough to slide the shifter cable end out of the pinch bolt, toward the back of the bike.
    Caution.png Do not allow the hardware to come fully off the derailleur. Contact Product Support if the hardware does accidentally come off.
    mceclip10.png   mceclip11.png
  7. Remove the shifter cable. 
    1. Shift the bike into 7th gear.

    2. Locate where the shifter cable meets the shifter. Pull the housing away from the shifter and toward the center of the bike to expose some of the cable near the shifter.

    3. Push the cable through the shifter and toward the handlebar end, then grab the shifter cable end and gently pull the cable all the way out of the cable housing and shifter.

      mceclip14.png   mceclip16.png
  8. Loosen the shifter clamp bolt and remove the old shifter. Use a Phillips or flat head screwdriver to apply firm and constant pressure to the shifter clamp bolt on the underside of the shifter. Slide the shifter off of the handlebar end and recycle it according to local rules.

Install the New Shifter
  1. Install the new shifter. Slide the new shifter onto the handlebar and adjust it so it is usable by the rider. Tighten the shifter clamp bolt and torque to 6 Nm.

  2. Install the new shifter cable. With the shifter in 7th gear, insert the end of the cable into the cable opening (circled below) and carefully push the cable through the shifter body.

    mceclip21.png   mceclip22.png   mceclip23.png
  3. Pass the cable through the cable housing. If needed, remove the end cap on the cable housing and pass it over the cable end, then insert the cable into the cable housing.

    mceclip24.png   mceclip25.png
  4. Press the end of the housing into the opening at the shifter body. Then, push the rest of the cable through the cable housing.
  5. Pass the cable through the first cable guide by the chainstay. Most of our bike models (except the 2019 RadWagon), have two sections of cable housing (highlighted in orange, below) and one section of exposed cable near the chainstay (in blue). Follow the next steps to ensure the cable passes through the bike frame fully.

  6. Locate the first cable guide near the chainstay.
    1. Remove the cable housing from the cable guide and pass the cable through the housing.

      mceclip32.png   mceclip33.png
    2. Pass the cable through the cable stop and fully seat the cable stop in the cable guide.

      mceclip34.png   mceclip35.png
  7. Locate second cable guide.

    1. Remove the cable housing from the cable guide.

    2. Pass the cable through the housing and seat the housing in the cable guide.

  8. Install the shifter cable at the derailleur.
    1. Ensure the chain is on the smallest cog and the shifter is in 7th gear.
    2. Pass the cable end through the barrel adjuster and the small opening and notch between the cable pinch bolt and backing nut. 

      mceclip39.png   mceclip40.png   mceclip41.png
    3. Pull the cable so there is no slack, but not so tight that the cable moves the derailleur body in toward the wheel, and use a 5 mm Allen wrench to tighten the cable pinch bolt.

  9. Check that the cable housing is seated in the cable guides on the frame. Trace the shifter cable from the handlebar to the rear of the bike to make sure the cable housing ends are fully seated in the cable guides.

    mceclip44.png  mceclip51.png  mceclip48.png  mceclip50.png
  10. Adjust the derailleur and take out cable slack if needed. With the rear wheel off the ground, rotate the pedals forward by hand and shift through the gears. Adjust the derailleur if needed.
  11. Cut the cable to size. Once the cable housing is fully seated in the cable guides on the frame, and the derailleur is adjusted and shifting properly, use cable cutters to trim off excess shifter cable. Ensure there is around 3” of cable after the cable pinch bolt on the derailleur.
  12. Install the cable crimp. Pass a new cable crimp onto the cable end and use the crimp portion of the cable cutters or needle nose pliers to secure the crimp at the end of the cable.

    mceclip52.png   mceclip53.png  mceclip55.png
Reinstall all Parts
  1. Reinstall the brake lever. Pass the brake lever onto the handlebar end and use a 5 mm Allen wrench to tighten the brake lever bolt. Torque to 6 Nm.

    mceclip56.png   mceclip57.png
  2. Reinstall the twist power assist. Slide the twist power assist and then the spacer onto the handlebar end. If the twist power assist has a button, rotate the twist power assist to the button is easily accessible by the rider. Use a 3 mm Allen wrench to tighten the twist power assist bolt. Torque to 3 Nm.

    mceclip59.png   mceclip62.png
    Caution.png The spacer must be properly installed between the twist power assist and the handlebar grip for the bike to operate safely.
  3. Reinstall the handlebar grip. Apply a small amount of isopropyl alcohol to the top of the handlebar end and then slide and twist the grip into place. Once the grip is flush with the handlebar end, reinstall the end cap. Once the alcohol  dries, the handlebar grip should not move or twist easily.

    mceclip64.png   mceclip65.png
  4. Plug in the brake connector and the twist power assist connector. Locate the matching connector ends, line up the internal notches and pins (and external arrows) and press directly together, without twisting, to reconnect.

    mceclip68.png   mceclip69.png
    Brake-wiring harness        Twist power assist-wiring harness
  5. Reinstall zip ties. Organize the cables and replace the zip ties. Snip zip ties so they are flush and smooth.

    mceclip70.png   mceclip71.png
  6. Reinstall the battery and test the bike fully before riding.
Caution.png Improper installation of the shifter, cable, and derailleur adjustment can result in unsafe operating conditions, damage to the bike, property, serious injury, or death. If you are not confident in your ability to successfully and safely perform all steps, we recommend having the work performed or checked by a local, certified, and reputable bike mechanic.


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