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.). 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. Some of these computers use a different calibration number for miles.The simplest method is to set the wheel sensor for a nominal tire size.
ECHO T3 CYCLE COMPUTER MANUAL SERIES
If the model name is highlighted, clicking on it will take you to detailed setting instructions.Ītech Avocet 15, 25, 35 (Km), 40 (Km), 45 (Km) 50 (Km) Bell F12, F20 Bikemate Brio7 CatEye Astrale, Astrale 8, ATC, Cordless 7, Kosmos, Solar (Km), Solar II Diamondback AC 3 Echo-3 J-7 Mongoose Compact Cycle Computer Paramount Series 8, Series 10 (Km) Planet Bike Protege 5, Protege 8 & 9, Polar S625X, Raleigh Pro-7, Sachs Huret (Km) Shimano Flight Deck Schwinn Function 12 Sigma BC 400 (km) BC 401 (km) BC 500 (km) BC 506 BC 509 BC 600 (km) BC 700 (km) BC 800 (km) BC 906 BC 1009 BC 1009 STS BC 1106 BC 1106 DTS BC 1200 (km) BC 1200+ (km) BC 1400 (km) BC 1600 (km) BC 1606L BC 1606L DTS BC 1609 BC 1609 STS BC 1609 STS + cadence BC 1706 HR BCS 1909 BC 2006 MHR BCS 2209 ROX 8.0 ROX 9.0 Targa Trek Radar, Sensor Sonic Sonic 2 Vetta Compact Cycle Computer, Cycle Computer (Km), C-5, C-06 C 10, C 15, C-16, C 20 (Km), C-100, Wireless C-200, C300, Wireless C-500, HR1000, RT33, RT55, RT77, RT88, VHR25, VHR50, V100, V100A, V100HR Circumference in millimeters
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