The cleat position on the sole may also be recorded. It is also useful to record user preference of either a fixed or floating type of cleat. Changing pedal types may affect the saddle height. Record the preferred large and small chainring sizes. Arm length in millimeters is typically labeled on the back of the crank. Cranks are measured from the center of the pedal mount to the center of the spindle square. Place straight edge on lower drops and measure tip of lever as above (+) or below (-) this line. Record position of brake levers on handlebars. If the bar extension is adjustable in reach, also record reach from bar center to end of extension. Measure angle of aero-type extensions from horizontal. If the lower section is sloping upward, toward the rider, record this as a negative number. In other words, if the lower section is pointing downward, or more toward the rear axle, record this as a positive number. Record any positive or negative angles to be consistent with the system use on the stem. Measure drop type bar angle off of lower section of drops using level angle finder. Replace bar if this measurement is different. The width after the crash can be compared to the width before the crash. It is use to know bar width when bike is crashed. However, when a bar is wrapped with thick tape, this makes an accurate measurement more difficult. Some manufacturers specify width as an outside to outside dimension. Measure width from center to center at the lower section of the drops. The manufacturer’s angle is then 90 - 18 + (-6), or 66 degrees.
In the right image below, assume the stem sloped downward 6 degrees instead. The manufacturer’s angle is then 90 - 18 + 25 = 97 degrees. (This means the headtube angle as the bike sits is 72-degrees.) The angle from horizontal is 25-degrees. For example, a bike is measured and the angle from vertical is 18-degrees. Stem angles sloping upward are recorded as positive numbers, while stem angles sloping downward should be recorded as negative numbers. It is possible to measure the manufacturers angle by taking the stem angle and the quill (steering column) angle. If this angle is known, record this as well. NOTE: Some stem manufacturers specify stem angle using the steering column as a reference. It stem is upward sloping, record as a positive number ( + ). In the stem is downward sloping, record as a negative number ( - ). Especially on shorter stems, hold angle finder so it is parallel to stem angle. Measure center of the stem binder bolt to the center of the bars. It is easiest to tape line to saddle so it hangs from saddle end and extends freely toward the ground. Record downward sloping saddles with a negative number (-).ĭrop a plum bob line from the saddle tip and measure distance from line to center of bottom bracket. If the front end of the saddle is raised, record this upward sloping saddles as a positive number (+). Using a straight edge on top of saddle, measure saddle angle from horizontal. Measure from saddle tip to the center of the bars at the stem. However, this number is also related to stem length, fork rake and wheel base, making it less useful when setting up a duplicate position on a different frame. This is a useful measurement when tracking changes in position on the same bike. Measure from lower edge of straight edge to top of handlebars.Īnother option is to measure from the front axle to the top of the bars. Use level finder to hold straight edge horizontal from saddle. Use a straight edge on top of the bars, and measure to lower edge of the straight edge.Īnother option is to use a long straight edge and the level finder. A simple method is to measure perpendicularly from saddle to ground, and then bar to ground, and take the difference between these two measurements. Record handlebar-over-saddle height difference. A simple method is to place a straight edge on top of the saddle and record height from the bottom bracket center to the lower edge of straight edge. Record saddle height and note method of measurement. It is also recommended that the traveling rider carry a recent photo of the bicycle. Assume this will be used in a police report of a stolen bike. Also record bike’s color scheme and any unique or obvious physical characteristics that might distinguish this bike.
#ROAD BIKE GEOMETRY CALCULATOR SERIAL#
Also record bike make, model, year of production, and serial number. Complete the chart and makes notes with the assumption that someone else will need to set up a bike from only this chart.īegin by recording customer/rider information, such as name, address, etc. For example, record “50cm” for fifty centimeters, and “50mm” for fifty millimeters. It is important that the user be consistent and that the method of measuring is noted. There is often more than one method for measuring a component or position. If possible mount bike on trainer and level bike by checking that both wheel axles are the same distance from the ground.
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