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Old 12-25-10, 07:53 PM   #1
tlarwa
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Question Rear Cadence Sensor Computer for Frame With Fat Chainstays?

I just finished my son's crit bike (CSK aluminum frame). Went to install the new Cateye Strada Double Wireless computer I got him only to discover that the chaimstays are too fat to accommodate the double sensor (see pics attached). Basically, the stays are fat and flat on the top, and the sensor interferes with the rear wheel (there's no chance of it mounting properly). We were going with the Cateye DW so that it would show speed/cadence on the trainer. Any suggestions for other computers that will be compatible with these chain stays? By the way, I have a brand new Cateye Strada DW for sale if anyone is interested!

I need to source and install a new computer before he heads back to college, so I'm looking for some help!

Tom


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Old 12-25-10, 08:10 PM   #2
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I have my cadence sensor very near the junction of seat tube and stay. Since you are only trying to see how many times the magnet passes it, it should work anywhere along the pedal's length. You might try to get it into the space right behind the BB shell. I have Astralle 8's, and they use zip ties for securing the sensor, so you should be able to get them to clear.
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Old 12-25-10, 08:25 PM   #3
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The problem with the Cateye sensor is that there's not enough space between the stay and the wheel for the speed sensor. The other issue is that the bottom of the sensor is curved (to fit a rounded stay) and the top of these stays are mostly wide and flat.

Tom
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Old 12-26-10, 02:40 PM   #4
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The bottom side of the stays is flat, too, right?
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Old 12-26-10, 04:46 PM   #5
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I have had some success making "customs" mounts for sensors using pieces of plastic or wood that I shaped to fit the surface of the stay and the sensor. Epoxy is also useful for this purpose. In your case you can probably mount the sensor under the stay this way and get it the right distance from the crank.
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Old 12-26-10, 05:07 PM   #6
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One of the things I've bought that I found to be a total waste is a cadence sensor. It is good enough to count for 6 seconds and multiply by 10. Maybe you could teach him to count and multiply and save some effort?
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Old 12-26-10, 10:20 PM   #7
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Originally Posted by Latitude65 View Post
One of the things I've bought that I found to be a total waste is a cadence sensor. It is good enough to count for 6 seconds and multiply by 10. Maybe you could teach him to count and multiply and save some effort?
Although there are obviously differences of opinion, some of us who have cadence find it useful. I'd figure out how to mount it, and let HIM decide if he likes it.
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Old 12-26-10, 11:13 PM   #8
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The Cateye Strada w/ Cadence is wired and uses zip ties to hold two separate sensors on the chainstay. Should work fine.
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Old 12-27-10, 10:37 AM   #9
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One of the things I've bought that I found to be a total waste is a cadence sensor. It is good enough to count for 6 seconds and multiply by 10. Maybe you could teach him to count and multiply and save some effort?
He's a Mechanical Engineering major at the University of Minnesota. I think he knows how to count and multiply, thank you.
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Old 12-27-10, 10:39 AM   #10
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The Cateye Strada w/ Cadence is wired and uses zip ties to hold two separate sensors on the chainstay. Should work fine.
I don't care for the wired cadence option, since the wire has to be run all the way down the bike. It looks like the Sigma wireless will be a good option. It has separate cadence and speed sensors as well. Thanks!
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Old 12-27-10, 11:44 AM   #11
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The garmin speed/cadence sensor (gsc10 if i remember correctly) would work perfectly with those stays. it comes with flat and curved bottom plates and the adjustable, swinging speed pickup gives you 180 degrees of adjustability.

...but, then you have to buy a garmin
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Old 12-27-10, 12:00 PM   #12
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One of the things I've bought that I found to be a total waste is a cadence sensor. It is good enough to count for 6 seconds and multiply by 10. Maybe you could teach him to count and multiply and save some effort?
3 pedal strokes per second -- or 3 revolutions per 2 seconds -- is 90 rpm. Even quicker.
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Old 12-27-10, 01:15 PM   #13
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One of the things I've bought that I found to be a total waste is a cadence sensor. It is good enough to count for 6 seconds and multiply by 10. Maybe you could teach him to count and multiply and save some effort?
For short efforts at 800W and longer ones at 95% of my maximum heart rate I can't count, just grunt.
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Old 12-27-10, 01:51 PM   #14
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You might want to call Cateye about fitting that sensor. They may have dealt with this issue.

Also, the V3 cadence and speed sensor has a slightly different design that might address the clearance issues. You might want to look at that.
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Old 12-29-10, 10:49 PM   #15
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Originally Posted by 2005trek1200 View Post
The garmin speed/cadence sensor (gsc10 if i remember correctly) would work perfectly with those stays. it comes with flat and curved bottom plates and the adjustable, swinging speed pickup gives you 180 degrees of adjustability.

...but, then you have to buy a garmin
No. the GSC10 is ANT+ compatible so it will work with other head units. http://www.thisisant.com/modules/mod...Select&prod=57
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Old 12-31-10, 08:31 PM   #16
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He's a Mechanical Engineering major at the University of Minnesota. I think he knows how to count and multiply, thank you.
Really?

Then maybe he can figure it out?
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Old 01-01-11, 06:15 PM   #17
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Is it just me or do I not see the pictures.
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