How to Calculate Bicycle Stem Length

Although basic in design, the humble bicycle stem serves a crucial role. At the very least, the stem functions as a bridge between the handlebar and steering column, allowing the two to work in unison. More personally, a stem helps a cyclist dial in a proper fit. Stems come in multiple lengths, helping each rider achieve a comfortable reach to the handlebar. Once a comfortable stem is found, calculating its length is helpful whenever replacing the stem or purchasing a new bicycle.

Things You'll Need

  • Measuring tape
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Instructions

    • 1

      Straddle the bicycle just behind the handlebars. Place a foot on either side of the front wheel, and center the wheel.

    • 2

      Note the bolt atop the steering column. The bolt secures a top cap that in turn helps keep the steering column end of the stem in place. Place the tip of a measuring tape in the very center of the bolt.

    • 3

      Stretch the measuring tape in the direction of the handlebar. At this end, a clamp plate joins the handlebar to the stem. Measure to where the clamp plate meets the stem, at the center of the top of the handlebar.

    • 4

      Convert the measurement to metric if using a standard measuring tape. Multiply the length in inches by 2.54 to convert to centimeters. Like many bicycle parts, stem length is typically listed in either centimeters or millimeters.