Bicycle Repair for Crank Removal with Stripped Threads

The cranks on a bicycle feature threads, located where the cranks meet the frame, that accept a special crank-removal tool designed to push the spindle/axle against the cranks and force the cranks off of the frame. These threads may strip due to improper usage of the crank removal tool. In this situation, it is necessary to find an alternative way to remove the cranks. There are three possible ways to get this done: in order of cost-efficiency, assuming the cranks are square-taper (which is the most common type) and that the reader has no special tools readily available.

  1. Ride the Cranks Loose

    • Remove the crank bolts (with either a socket wrench or Allen key) and ride the bike slowly in an isolated area, such as an empty parking lot or backyard. At this point, the only thing holding the cranks on to the spindle is the wedge force that the crank bolts generated on the the spindle. The spindle is the square-sided protrusion from the frame that the cranks attach to. With time, the cranks should loosen, however, the square hole may be somewhat damaged using this method. This is the cheapest way to remove the cranks (free) and they can even be reinstalled with care.

    Take It to the Shop

    • Take your bike to the local bike shop. It has a tool called the "Var #932" that is specifically made to extract cranks with stripped threads. Unfortunately, this tool is only available to bicycle dealers and shops--individuals are not able to buy it without a dealer's account. The local bike shop will likely charge only its minimum labor fee.

    Use a Gear Puller or Ball Joint Extractor

    • Go to an automotive supply store and rent a gear puller or ball joint extractor. These tools are designed for cars, but if you are especially desperate, place a deposit on one and use it to remove the cranks from your bike.

      Use a ball joint extractor (or "pickle fork") by wedging the fork tines between the crank and frame so that the spindle is between the tines. Hammer the end of it until the crank comes off.

      Use a gear puller by resting the threaded part of it on the spindle and placing the grip arms underneath the crank arm (make sure there is a block of wood or rubber between the two, as the metal may gouge the crank). Turn it a few times and it should come off; however, take care not to damage your cranks unless you plan to dispose of them.

      The deposit/rental price for these tools may be refundable.