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  1. #1
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    Correct wheel size setting for my bike computer??

    i just installed a planet bike wireless bike computer, the chart that it came with doesn't have the size of the tire thats on my downtube 9fs. the size is 20x1.5 on front somehow the rear tire is 20 x 1.75. i am mounting the computer sensor on the front wheel. i did some calculations and i had 1555 as the wss, is that right?

    the bike sensor is kinda strange, on the manual it said to mount the sensor with the battery cover on the inside which i did and the sensor couldn't pick up any signal, i had to mount it on the opposite side with the battery cover outside and logo on the inside. i will get a picture later on, let you guys see if i did something wrong or not. i also just put on a headlight, tail light and bottle cage. everything looks great.

  2. #2
    Senior Member snafu21's Avatar
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    5190. No, um 5910. No, um


    er........
    - every mile of road has two miles of ditch -

  3. #3
    Car free since 1995 pm124's Avatar
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    The chart will never give you an accurate reading. You just need to measure the circumference of your wheel with a steel tape measurer. Here is one funny way of doing this.http://www.sheldonbrown.com/brandt/circumference.html

  4. #4
    Bicyclerider4life
    Join Date
    Aug 2006
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    Florida and Idaho
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    Huffy Beach Cruisers, Miami Sun Trike, Vertical PK7, KHS Montana Summit, Giant Cypress DX, Schwinn OTC Stingray
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    Quote Originally Posted by pm124 View Post
    The chart will never give you an accurate reading. You just need to measure the circumference of your wheel with a steel tape measurer. Here is one funny way of doing this.http://www.sheldonbrown.com/brandt/circumference.html
    Maybe I should try that for my Miami Sun trike. Manual did not have any info for 24 inch wheel, so I used the mile marker posts and set it so one mile by the posts was one mile on the odometer. I got it down to within a couple inches, and thought that was close enough.
    "Whenever I see an adult riding a bicycle, I know there is hope for mankind." (H. G. Wells)

  5. #5
    Senior Member
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    Feb 2007
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    Make a line on the tire with chalk and then ride a bit and measure the distance between chalk marks on the ground.

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