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Old 02-06-07, 01:13 PM   #1
donhaller 
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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
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Old 02-06-07, 01:23 PM   #2
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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.
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Old 02-06-07, 01:30 PM   #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.
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Old 02-06-07, 01:39 PM   #4
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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?
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Old 02-06-07, 01:47 PM   #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.
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Old 02-06-07, 02:39 PM   #6
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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.
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Old 02-06-07, 02:52 PM   #7
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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.
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Old 02-06-07, 03:01 PM   #8
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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.
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Old 02-06-07, 03:15 PM   #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.
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Old 02-06-07, 03:35 PM   #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
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Old 02-06-07, 03:59 PM   #11
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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.
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Old 02-06-07, 06:08 PM   #12
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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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