Removing the damaged spoke
A snapped spoke usually makes a sudden metallic pop during a ride. When you stop, you will notice the wheel spinning with a noticeable lateral wobble that rubs against your brake pads or frame. Identifying the broken piece is simple. Follow the rim until you find the loose jangling wire, or squeeze pairs of parallel spokes around the wheel until one feels completely limp. Unthread the broken segment from the brass nipple in the rim using a spoke wrench, and pull the remaining piece out of the hub flange. “Keep the old pieces,” says local mechanic Dave Miller, “because measuring them is the easiest way to buy the correct replacement length.”
If you are on the trail, you can temporarily wrap the broken spoke around an adjacent one to keep it from damaging your frame or derailleur. However, you should replace it before your next major outing. Riding on a wheel with missing support puts extra stress on the remaining metal wires, which can lead to a cascade of failures.
Measuring for a new spoke
Spokes are measured in millimeters from the inside of the elbow bend to the very end of the threaded tip. A difference of even two millimeters can prevent you from securing the wheel properly, so precision is vital. If the spoke broke at the J-bend, hook the pieces together as best as you can along a metric ruler to get the total length. Alternatively, you can remove a matching spoke from the same side of the wheel — drive side and non-drive side spokes are often different lengths — to use as a template.
Threading the wire
To install the new spoke, you must thread it through the empty hole in the hub flange. Match the direction of the surrounding spokes… alternating between heads-out and heads-in orientation. Carefully weave the spoke under and over the crossing spokes to mirror the existing pattern. Once the threaded end reaches the rim hole, insert a new brass nipple through the rim bed. Thread it onto the spoke by hand for several turns to avoid cross-threading, then use your flathead screwdriver or a dedicated spoke wrench to tighten it.
Before inserting the nipple, apply a drop of light oil or grease to the threads of the new spoke. This reduces friction as you tighten the nipple and prevents the metal threads from seizing over time. If you are working on a rear wheel on the cassette side, you might need to remove the gears first to access the flange holes easily.
Adjusting the final tightness
Slowly tighten the new spoke until it sounds similar in pitch to its neighbors when plucked. Spin the wheel to check for high spots and side-to-side movement. Tighten the nipple in half-turn increments, checking the alignment after each adjustment. It takes patience to get the rim running straight again, but working in small increments prevents over-correcting.
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