How to Adjust the Chain on a Fixed GEAR

True to its name, the fixed-gear bicycle has just a single gear. For some, the attraction to a fixed gear lies in the simplicity of the design. Like any bicycle, the fixed-gear features a chain that transfers power to the rear wheel. Proper adjustment of the chain is crucial to both the performance of the bicycle and the safety of the rider. A loose chain can slip from the front or rear cog. A chain that is too tight can causes the hub and bottom bracket bearings to bind.

Things You'll Need

  • Bicycle repair stand (optional)
  • 15 mm wrench
  • Measuring tape or ruler
  • Rag
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Instructions

    • 1

      Set your fixed-gear bicycle in a bicycle repair stand. Alternatively, turn the bicycle over, balancing it on its handlebars and saddle.

    • 2

      Note the middle of the chain, between the front and rear cogs. Use a finger to this section of chain up and then down. Use a measuring tape to measure the amount of travel. If the chain travels more than 1/2 inch, the chain is too loose. If the chain travels less than 1/4 inch, the chain is too tight.

    • 3

      Use a 15 mm wrench to loosen each rear axle bolt. Loosen these bolts equally to keep the wheel centered in the frame.

    • 4

      Slide the wheel forward or backward as needed. If the chain traveled more than 1/2 inch, pull the wheel back. If the chain traveled less than 1/4 inch, slide the wheel forward.

    • 5

      Check that the wheel has remained centered in the bicycle frame following tension adjustment. If it is not center, one end of the axle is not even with the other end.

    • 6

      Check the chain tension once again, using your ruler or measuring tape to measure the the up and down travel of the middle section of the chain.

    • 7

      Cover your index finger with with a section of old rag. While pedaling the bike slowly with hand, use the rag-covered finger to push sideways against the upper section of chain midway between the front and rear sprockets. Repeat this test for the lower section. The chain should not come off the front sprocket. If it does, pull the wheel further back to increase tension on the chain.

    • 8

      Use your 15 mm wrench to tighten both axle bolts evenly.