Miniwave Crank Arm ReplacementUpdated a few seconds ago

If a crank arm on your Miniwave is bent, cracked or has damaged pedal threads, it will need replacing. This guide shows you how to identify your cranks, remove them and fit new ones.

In this guide, right and left are as if you are sitting on the bike. The right side has the chain and gears (the drive side); the left side has no gears (the non-drive side).

Miniwave Crankset

• Crankset: PROWHEEL, 48T chainring
• Crank length: 170 mm

The Miniwave’s crank arms are replaced as a matching pair. Please contact Ridewave Support with your order number and a photo of the damage to order the correct parts.

Tools Required

• 8 mm hex key (crank bolts)
• Crank puller
• Pedal wrench, or a thin 15 mm spanner
• Bike grease

Step 1 — Check Your Crank Style

Remove one crank bolt with the 8 mm hex key and look inside the crank arm.

The hole for the bottom bracket spindle is either square or diamond shaped. Replacement arms must match, so include a photo of this when you contact us.

Step 2 — Remove the Pedals

• The right pedal loosens counter-clockwise.
• The left pedal is reverse-threaded and loosens clockwise.

Step 3 — Remove and Fit the Crank Arms

1. Remove the crank bolts with the 8 mm hex key.
2. Thread the crank puller into the crank arm by hand until it stops, then use it to push the arm off the spindle. Don’t force the puller in if it feels tight straight away — you could strip the threads.
3. Fit the new arms so they point in opposite directions (180° apart).
4. Tighten the crank bolts to 39 Nm.

For more detail and photos of the crank puller, see Miniwave Bottom Bracket Service and Replacement.

Step 4 — Refit the Pedals

1. Check you have the left pedal on the left and the right pedal on the right (they are usually marked L and R).
2. Put a little grease on the pedal threads.
3. Start threading each pedal by hand. It should turn easily — if it doesn’t, back it out and start again. Forcing a pedal in at an angle will cross-thread and ruin the crank arm.
4. Finish tightening with a pedal wrench or thin 15 mm spanner. A spanner that is too thick can’t fully tighten the pedal, which can damage the threads once you ride.

Looking After Your Cranks

• Check every so often that the crank bolts and pedals are still tight.
• Keep the bike clean of dirt and road grime to make the pedal bearings last longer.

Need Help?

Any bike shop can replace crank arms — it doesn’t need to be an e-bike specialist. If you have questions, contact Ridewave Support.