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  1. #1
    Senior Member donhaller's Avatar
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    Can I mount a computer sensor on the rear chain stay?

    I want to use my computer while on the trainer. It is designed for a fork installation, but I want to measure distance while riding indoors.

    Thanks

  2. #2
    Scott n4zou's Avatar
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    Most wired Cyclocomputers would have a wire too short to reach between the handlebar and seat stay. As you don’t need to keep your eyes on the road you could just use Velcro to attach the Cyclocomputer to the top tube instead of the handlebar. When you switch from the trainer setup simply reinstall the Cyclocomputer as you normally would.

  3. #3
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    Cat-Eye offers an accessory rear wheel pickup mount that takes any of their computer heads. They also have a computer model (the Astrale) that comes standard with a rear wheel speed pickup and a cadence pickup, both of which fasten to the chainstay.

    As noted, if you have to use your current cyclometer, you can fasten the "handlebar" mount to the top tube just in front of the saddle.

  4. #4
    Senior Member donhaller's Avatar
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    Quote Originally Posted by n4zou
    Most wired Cyclocomputers would have a wire too short to reach between the handlebar and seat stay. As you don’t need to keep your eyes on the road you could just use Velcro to attach the Cyclocomputer to the top tube instead of the handlebar. When you switch from the trainer setup simply reinstall the Cyclocomputer as you normally would.
    I have a Performance Bike, "Ascent" house brand wireless computer. Would it transmit from the rear of the bike up to the handlebars you think?

  5. #5
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    Quote Originally Posted by donhaller
    I have a Performance Bike, "Ascent" house brand wireless computer. Would it transmit from the rear of the bike up to the handlebars you think?
    Probably not since the fork mounted transmitter usually needs to "see" the computer head directly. You can give it a try but don't be surprised if it doesn't work.

  6. #6
    Last one to the top... Little Darwin's Avatar
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    Quote Originally Posted by donhaller
    I have a Performance Bike, "Ascent" house brand wireless computer. Would it transmit from the rear of the bike up to the handlebars you think?
    You should call Performance and ask... Taake their answer as optimistic if they say yes, and pessimistic if they say no... then try it.
    Slow Ride Cyclists of NEPA

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  7. #7
    Broom Wagon Fodder reverborama's Avatar
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    For my trainer I mounted the sensor of the cheapest computer (9.99 at Target) I could find on the chainstay with a section of pneumatic hose under it to space it out enough for the right gap between the sensor and the magnet. I marked one of the two wires and made a cut. I added about a foot of wire being careful not to reverse them (in case that mattered) and taped it up with electrical tape. Works great.

  8. #8
    He drop me Grasschopper's Avatar
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    Quote Originally Posted by donhaller
    I have a Performance Bike, "Ascent" house brand wireless computer. Would it transmit from the rear of the bike up to the handlebars you think?
    With brand new batteries it may work...but the distance is pretty far....like at least double and more like triple the range they want that sensor in.
    The views expressed by this poster do not reflect the views of BikeForums.net.

  9. #9
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    Quote Originally Posted by reverborama
    I marked one of the two wires and made a cut. I added about a foot of wire being careful not to reverse them (in case that mattered) and taped it up with electrical tape. Works great.
    This will work fine if you keep the bike inside or do a VERY careful job of making your connections secure and water tight. I wouldn't do this on a bike that's on the trainer part of the year and ridden outside the rest. The impulse signals are pretty weak and it doesn't take much to interfer.

  10. #10
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    Considering the price of a Cateye Astrale it would make good sense to mount one permanently. Then you would have reliable speed, time, distance, and cadence all of the time.

    Al

  11. #11
    In beaurocratic limbo urbanknight's Avatar
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    Quote Originally Posted by reverborama
    For my trainer I mounted the sensor of the cheapest computer (9.99 at Target) I could find on the chainstay with a section of pneumatic hose under it to space it out enough for the right gap between the sensor and the magnet. I marked one of the two wires and made a cut. I added about a foot of wire being careful not to reverse them (in case that mattered) and taped it up with electrical tape. Works great.
    Now for the OP, how do you suggest doing that with a WIRELESS computer?

    I would just try it. Worst case, you cost yourself another zip tie.

  12. #12
    Senior Member donhaller's Avatar
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    Thanks guys - I'm gonna put it on there tonight just to see if it will work. If not, I'll go buy the correct one. It's just that I had this one, and was trying to cheap a buck, if you know what I mean.

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