You may use the valve stem as a reference, starting the roll with the valve right over a perpendicular line, and ending when the valve is back at its low point.Īnother approach is to put a small dot of paint on the tire and measure the distance between the marks that the paint prints on the road. It is possible to do a roll-out test while lightly scooting along while bearing weight on the handlebars and one foot on a pedal, but it's better to have an assistant holding the bicycle upright and pushing it along. Since the effective tire size is affected by tread thickness, tire pressure and rider weight, the rolling circumference should be measured by rolling the bike with the rider aboard. The rear wheel "creeps" on the road surface as you pedal, and can skid during braking, so it gives a less-accurate readout. Unless you need to count "miles" ridden on a stationary trainer, it is best if you measure the roll-out of the front wheel and mount the computer sensor there. If you require more accuracy, you can do a "roll-out" test. Values read from a chart or derived from ISO/ETRTO numbers will generally be accurate to within one or two percent, which is good enough for most cyclists, and more accurate than most automobile odometers. If your marked tire size falls between two sizes shown on the chart, interpolate the appropriate calibration number between those above and below, or for greater accuracy, do a roll-out test (keep reading.).ĭeriving tire size from ISO/ETRTO numbers The chart below doesn't list all possible tire sizes, but does list the most popular ones. The table below is based on rim sizes and tire cross-sections rather than than nominal sizes. It is less than 19 inches in effective diameter. For example, a 44-406 (20 x 1.5") tire is not really 20 inches in diameter. Tires which a national standard identifies by outside diameter actually vary depending on the tire cross section. Group Aĭifferent manufacturers have used different brands of tires to calibrate - or have done calculations based on nominal dimensions - so there can be a slight inconsistency between the numbers in the tables and the most accurate number for your bicycle. We have classified cyclecomputers into six groups according to the number used in calibrating them. We have provided tables of tire sizes for this purpose. Its simple design, large display, and long battery life make it an excellent option for cyclists looking for a functional and low-maintenance computer for their bike.The simplest method is to set the wheel sensor for a nominal tire size. Overall, the Cateye Padrone CC-PA100W is a reliable and convenient bicycle computer that provides essential cycling data to riders. This feature eliminates the need to manually turn the computer on and off. It also features an auto start and stop function, which means that the computer will start and stop recording data as soon as the user begins or finishes a ride. The Cateye Padrone CC-PA100W has a single button operation, making it easy to switch between modes and reset data. Its battery life is long-lasting, and it automatically enters sleep mode when not in use to conserve power. The computer can be mounted on the handlebars or stem of the bike with a bracket that is included in the package. Its user-friendly design allows for simple installation and setup. The computer is wireless and uses analog sensors to measure data, which minimizes interference from other electronic devices. Its large display makes it easy to read even during rides in bright sunlight. The Cateye Padrone CC-PA100W is a bicycle computer that displays cycling data, such as current speed, average speed, distance, and elapsed time.
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