(mm)” boxes. The alphabetical size format is mostly used on older bikes. The chart shows the actual speed of the original tire and upgrade tire if the speedometer has not been calibrated for the change in tire size. This calculator allows you to tell the difference between the tires in inches, centimeters, and percentages. Wheel circumference = Wheel diameter * PI. some) and MPH (which is a number used by some Sigma computers which don’t automatically convert mm when you want to view your speed in MPH instead of Use this calculator at your own risk. If you By using this calculator you acknowledge any reliance on this calculator shall be at your sole risk. have gained even quicker acceptance since it was a standard tire size already. Motorcycle and dirt bike tire sizes can be expressed in 3 basic formats: Alphabetical, Metric and Inch. Roll forward one revolution of the wheel so the valve stem is at the bottom of the wheel again. Figure 2: The same data but with wheel speed corrected using a Dunlop-supplied formula for rolling radius of the rear tire. Your motorcycle tires have government mandated information on the sidewall that can be used to calculate their diameter. Ratio: In this case it is .60. The first number is the width of the tire in millimeters, measured from sidewall to sidewall. Motorcycle speed and sprocket calculator with bike database for gearing, sprockets, tires and chains of over 1600 bikes. Please note: Not all 24″ wheels were created equal, try to find the ISO/ETRTO number and use that. The sidewall height of the tire as a percentage of width. This will give a higher factor then your 0,96 for low h/w tires( aspect ratio AR) and the other way around for fi 80%AR lower pressure gives more deflection so shorter loaded radius, and longer surface on ground , so in the end shorter rolling circumference. (mm) field. On the other hand you can buy insanely stupid wide tires found This calculator provides tire conversion details in both metric and standard units for a given tire. Thanks for visiting! The information in the Required area is needed to perform the comparison. Two suggested ways to do this are: No matter how you set your wheel size, you can improve it’s accuracy by riding a measured mile, then adjust your setting based on the following This calculator allows you to tell the difference between the tires … Measure the distance between the two marks in mm. The tire circumference varies depending on the rim, the inflation pressure and the load on the tire. For these reasons, it is not possible to list an exact tire circumference. Should gear ratio comparison page! The tool can be useful for finding out whether or not an alternative tire size is compatible with your vehicle. e.g., It compares the circumference and the outer diameter of one or more additional tires to the base tire and gives an information about upsizing/downsizing: does the new tire exceeds the recommended upper or lower … Note, it assumes the speedometer is calibrated to the original tire. It allows the user to compare two different tires. For example, I’m not sure what marketing genius decided to call them 29ers, but I would think 700c would Section Rubber down, paint up. It can put your life in risk while you are driving. Example: 185/60HR14. tire in millimeters, measured from sidewall to sidewall. Measure that distance in mm. inflated to the pressure you normally would use. Usually we would use the outer circumference of the tire in the calculation and understand that ground speed may be very different from wheel speed when the motorcycle is leaned over. Tire Size Calculator calculates tire diameter, circumference, revolutions per mile/km from the tire size designation on a tire. Show, go, or cruise. Simply read the tire specifications on your sidewalls and calculate the tire's diameter.
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