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  1. #1
    Join Date
    Apr 2006
    Location
    somewhere between the Red & Rio Grande
    Posts
    5,310

    Question CatEye Astrale 8 & 650 Tires

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    Anyone know the proper settings for the CatEye Astrale 8 and 650 x 23 tires? My husband's CatEye reads differently (using the setting for 700s in the instructions). Mine seems to be cheating me out miles- it is annoying!

  2. #2
    Join Date
    Nov 2004
    Posts
    407
    http://www.cateye.com/en/pdfs/CD200N.pdf

    Or you might just try adjusting it little by little when you ride with your husband until your mileages line up...
    Just keep pedaling.

  3. #3
    Join Date
    Apr 2006
    Location
    somewhere between the Red & Rio Grande
    Posts
    5,310
    Thanks Renee, we keep tinkering with it. Maybe we will get the magic number soon!

    It is the tire circumference that is off on mine. We have tried to get them lined up and are off by about .50 for a 20 mile ride. My average speed is slightly lower. Overall, it gives me a pretty close measurement. I just want it perfect. My poor husband has tried to figure out the math at least 3 times.

  4. #4
    Join Date
    Jan 2006
    Location
    Massachusetts
    Posts
    2,559
    The way to get it perfectly tuned to your bike is to roll the bike N tire rotations and measure the length L. Then L/N is the length of one tire rotation and goes into the computer expressed as millimeters. Maybe use your driveway and mark the valve-down tire position with chalk, then roll the bike forward with your weight on it, and mark the valve-down position again after 5 tire rotations. Do this with your husbands's bike too, and you should be in sync.

  5. #5
    Join Date
    Jun 2004
    Location
    Nebraska
    Posts
    1,193
    You will never get the distances you ride up to line up exactly, you know. There will be small variations, such as the differing lines each of you take around corners, the odd wobble that one person has, the fact that one of you slaloms (can't spell it, you understand, right?) down a hill for fun, etc. This can add up to a lot of variation over a long ride.

    OTOH, your rolling speed should be really, really close.

    What I'm saying is, it will never be perfect, but you can probably get it "close enough for jazz."
    Give big space to the festive dog that make sport in the roadway. Avoid entanglement with your wheel spoke.
    (Sign in Japan)

    1978 Raleigh Gran Prix
    2003 EZ Sport AX

  6. #6
    Join Date
    Sep 2005
    Posts
    44
    If it's going to nag you, why not call/email Cateye and ask them what the setting would be? Or if it's possible, enter the tire size manually?

    (Otherwise, I agree, little variations can add up over a long ride - though I'd think to less than 1/2 a mile in 20.)

 

 

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