Triathlon - Help w/Odometer

I've got a Bell Odometer, (I know, I know...I'm cheap) anyway trying to figure out the wheel measurements to put in. I measured my wheel, actually just the rim and came up w/27 inches...Am I a complete idiot or did I do something wrong. Just trying to make sure my mileage and speed are correct. I put in 2154 after doing the math. Anybody know if I'm in the ballpark? Thanks

uhhhhh that would be right if you had 27in wheels (like on an old shwinn) why dont you look on your rims (or tires) do they say 700c? then look on your tire does it say 700-23? or somthing like that? you shouldnt be pulling out a measuring tape to do this.

You need to measure with the tire fitted and inflated to riding pressure - don't just trust what it says on the tire.

Then sitting on the bike (weight on bike needs to replicate as if you are riidng) and starting with the valve on the rim at the lowest point, roll forwards till the wheel has done one complete revolution. Measure and repeat a couple of times. Average the measurement and you will have a reasonably accurate measurement for this wheel and tire.

The wheels say 700 x 23c but the closest in the book is 26.6" (700 x 25c) = 2124. So I'm thinking about 2120.

try 2096. thats what i use int my polars for 700x23C.

(the things probably not that accurate anyway)

2096 is what Cateye says for 700x23c. Its actually going to vary based upon tire brand, inflation, and rider weight. However, the variance for those factors is probably within the tolerance of the accuracy of most people's roll out measurement capablity. So I just plug in 2096, and don't worry about it.

http://www.sheldonbrown.com/cyclecomputer_calibration.html

switch to gps no need for tire sizes workes with any size and no need to set that