Merida R903 set the code table when the need for tire diameter.

Please tell me which exact data Daren

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tire looking from another does not, if it is native, the tire should be 700C * 23, then code table Wheel diameter should be entered as 2133

If you looking from another, and then compared according to the following table bar

18C 2102

20C 2114

25C 2146

28C 2149

32C 2174

35C 2205

40C 2224

This is my Sigma 1606L User's Guide on the absolute accuracy. But because the tires touch the ground will certainly be after the deformation cause the actual wheel diameter decreases, so if the amount of the pursuit of perfection is still the best look, I am such a scrub in accordance with this standard on the digital input on the list