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Rim Size for Sigma 1600 Computer?
I am trying to setup a sigma 1600 cycle computer.
My rims are araya 700C PX 45. Looking in the Sigma manual it lists sizes 700x20C up to 700X40C. Which is the appropriate setting for my rim? Thanks |
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#2
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I think I answered my own question, looked at the tires and they are 40-622,
which equates to the 700X40C Sigma setting. "The Eye" wrote in message ... I am trying to setup a sigma 1600 cycle computer. My rims are araya 700C PX 45. Looking in the Sigma manual it lists sizes 700x20C up to 700X40C. Which is the appropriate setting for my rim? Thanks |
#3
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In article ,
"The Eye" wrote: I think I answered my own question, looked at the tires and they are 40-622, which equates to the 700X40C Sigma setting. "The Eye" wrote in message ... I am trying to setup a sigma 1600 cycle computer. My rims are araya 700C PX 45. Looking in the Sigma manual it lists sizes 700x20C up to 700X40C. Which is the appropriate setting for my rim? That setting is an approximation. While that may be close enough for your purposes, you can accurately measure the circumference and enter it into the computer. Actual circumference will depend on the actual tire used, the inflation pressure and the load on it. Place a mark on a flat smooth surface, and place the valve on it. With your usual weight on the bike, roll forward several revolutions and measure the distance. Divide by the number of revolutions and there's your circumference. -- Ted Bennett Portland, OR |
#4
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Ted covers it in a nutshell, for more detail visit Sheldon Brown's web
site. Happy Holidays |
#5
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On Sat, 25 Dec 2004 17:31:04 GMT, Ted
wrote: Place a mark on a flat smooth surface, and place the valve on it. With your usual weight on the bike, roll forward several revolutions and measure the distance. Divide by the number of revolutions and there's your circumference. For years I've just measured the OD of the wheel/tire (after changing tire brands, for example), multiplied by pi, and entered that into my cyclocomputers. This has always proven accurate to plus/minus one percent. jeverett3ATearthlinkDOTnet http://home.earthlink.net/~jeverett3 |
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