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Tandem Cycling A bicycle built for two. Want to find out more about this wonderful world of tandems? Check out this forum to talk with other tandem enthusiasts. Captains and stokers welcome!

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Old 08-11-05, 07:34 AM   #1
Doggus
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Cateye Astrale8 stoker mount questions

I've read here where a couple of people have mounted the Cateye Astrale8 for the stoker. Mine just came in and I'm wondering if I should have ordered the extra long cabling? I saw where one person ran the wiring to the front wheel, does this require the extra long cabling? Also what is the 'spider'? I read where the cadence was obtained by mounting to the captains cranks on the 'spider'. And one last question...I am having the LBS install a flight deck for the captain position. If I have the flight deck running off the front wheel can I also run the Cateye off the front wheel as well or is it better to run off the back?

TIA
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Old 08-11-05, 08:11 AM   #2
Murrays
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I have a Cateye Mity with the extra long cable running to the back wheel. I didn't think the cadence function worth the hastle of extra cabling.

-murray
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Old 08-11-05, 09:11 AM   #3
tandemtrouble
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I also have the astrale 8 mounted on the stokers bar.
Asked my LBC who said that mounting the speed sensor on the rear wheel was fine, and that cadence can go on the stokers crank.
A spider is another word for the crank arm. The arm will have 4 or 5 columns that then attach to the chainrings. When someone says 'spider', they mean crank.
So you'll have the speed sensor mounted to the rear-triangle known as the chain-stay, and the cadence sensor mounted just behind the seat-tube, again on the chain-stay. The round magnetic part attaches to the inside of the crank-arm. Hope this helps, but will send you pictures of my set-up if needs be.
One thing i did have problems with was the distance between the rear-sensor and the spoke. I ride a cannondale mountain tandem and the chain-stay flares-out a long way. I had to bastardise the chainstay so that the sensor could be a few mm from the spoke.
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Old 08-11-05, 09:18 AM   #4
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I'm not positive, but I thought the Astrale 8 was designed as a rear-wheel mount which, if it is, should provide you with enough signal wire to reach the front wheel (high on the fork) or rear wheel (near the rear brake bridge). Running a cadence signal wire from the stoker's position to the captain's cranks is an easy (but ugly) run, thus running both the speed and cadence to the stoker's rear wheel / cranks can often times be the cosmetically better solution.

A spider is another name for the four or five "legs" that come off the crank arm to hold the chain rings. There are a number of ways to put the pick-up sensor and magnet on either the captain's right or left hand cranks, e.g., sensor on boom tube, down tube, or mounted to custom bracket attached to eccentric with magnet strapped to right crank arm, left crank arm, spider leg, or epoxied to the inside of the chainring. It all depends on how tidy you want it to look.

It's no problem having more than one wheel speed pick-up on a front wheel; however, keep in mind that the magnets work just like the wheel balancing weights your tire shop puts on your car's rims. One or two small magnets placed on spokes next to the valve around the stem usually off-set the inherent out of balance weight distribution of a stock rim (less rim material at valve hole / more material at rim seam). Larger magnets (like Polar's) can be overkill.
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Old 08-11-05, 09:27 AM   #5
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Ahh, thanks for the informative posts. If the stock CatEye wires reach the rear wheel/stoker crank I'll definitely go that route or I'll get the Extra Long Mount kit that I've seen. I don't think I want to be running everything to the front wheel/Capt crank if I don't have to.

I posted about this in the Road Forum, but I'm trying to find those little clear stickys like what you see on a box of software (used to identify if you've opened the box) to tape the wire to the frame. I have zip ties on my single and hate it. Definitely want to go a more concealed route on our tandem.
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Old 08-11-05, 10:26 AM   #6
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Quote:
Originally Posted by Doggus
Definitely want to go a more concealed route on our tandem.
Orange vinyl electrician's tape... route the sensor wires to the underside of the top tube and tape them flat to the tube; they'll be nearly invisible. Same thing works along the inside of the stays.
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Old 08-11-05, 10:59 AM   #7
Jim Bonnet
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just installed this computer on my santana last weekend. Everything goes from stoker bars to rear wheel/left side spider. works just fine. the cabling on the 'normal' mount was barely long enough for my bike but did work.. used some clear tape to run the wire and zipties for the sensors.

good luck-
jim
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Old 08-12-05, 12:23 PM   #8
phil.
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Doggus -

I think you are referring to my setup where I've got the astrale8 running to the front wheel and the cadence off the front cranks spider. As mentioned by TandemGeek, the spider is the arms coming off the crank and attaches to the rings (4 or 5 arms). The reason I had to do this is becuase the magnet wasn't close enough to the sensor when it was on the cranks. If you need pics, let me know and I can get them for you.

Also I had to run the speed sensor to the front wheel because it wasn't quite long enough to run from the stoker's bars, stem, down captains seat tube and down the stoker's down tube and then out onto the chainstay far enough. The length difference that caused the problem was that you had to run the wire forwards and then back which is something you don't do on a single bike w/ this setup.

I'm also running a flight deck up front (wireless), the magnets are on opposite side spokes w/ the sensors on opposite fork legs. I nearly sent the astrale8 back until I figured out to run the speed sensor the front wheel. The "rear wheel computers" are just wired long is all, the mounts are all the same that I can tell.

phil.
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Old 08-14-05, 09:27 PM   #9
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Hey tandemgeek I did exactly what you said. Thanks! Orange Burley frame and orange tape works well. I ran my Cateye Mity 8 to the front fork with an extra long wiring kit. Now my stoker does not sound like a kid on a vacation askin "Are we there yet"... got tired of the "Whats are speed?" Now she nows.
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