Reducing magnet space on computer
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Reducing magnet space on computer
I've got a Sigma computer that requires less than 5mm distance between the pickup and the sensor. I have at this point 20mm distance, so it doesn't register at all. There is just no place on the frame and spokes to get it any closer.
So what do I do? Find some material to build the sensor in closer to the magnet? What kind of material would you use on a heat treated aluminum frame? I prefer to only have to mount it once?
Thanks for any help.
So what do I do? Find some material to build the sensor in closer to the magnet? What kind of material would you use on a heat treated aluminum frame? I prefer to only have to mount it once?
Thanks for any help.
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Why can't you mount the pickup and the magnet closer to the hub where the spokes get close to the hub? That's the typical answer. Do you have a wireless that does not work that far apart?
#3
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If push comes to shove, I have had decent luck with double-sided foam mounting tape. It is usually 1/16" thick and available in hobby shops and office supply shops.
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I had the same problem. I just used electrical tape and wrapped it around many times until it was thick enough. As already suggested, I would've used double sided foam tape if I had it. Much lighter.
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Another vote for two sided mounting tape. I used it to mount the cadence magnet on a crank with a hollow spot on the back.
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I moved my sensor to the disc side of the wheel because my new wheel set has radial lacing on the non-disc side. The spokes are farther away from fork on the rotor side. I made a spacer a little bigger than the footprint of the sensor. In my case, I cut a small piece from the wall of that thick plastic clear tubing (Tygon?) sold at Lowes which I keep on hand. I supplemented the two plastic ties with a few drops of Shoe Goo to make sure nothing moved.
The rotor side actually makes a better installation because you can run the wire up the brake cable. It looks neater (you hardly see it) and it's less prone to catching on branches and stuff because the brake cable keeps the wire behind the fork leg all the way up.
Since the wheel is laced two across on the rotor side, the sensor is closer to the hub now. I thought it might lose sensitivity. It didn't, it registers as low as 1.2 mph.
Al
The rotor side actually makes a better installation because you can run the wire up the brake cable. It looks neater (you hardly see it) and it's less prone to catching on branches and stuff because the brake cable keeps the wire behind the fork leg all the way up.
Since the wheel is laced two across on the rotor side, the sensor is closer to the hub now. I thought it might lose sensitivity. It didn't, it registers as low as 1.2 mph.
Al
Last edited by Al.canoe; 01-04-06 at 06:53 AM.
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Originally Posted by Al.canoe
I moved my sensor to the disc side of the wheel because my new wheel set has radial lacing on the non-disc side.
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Originally Posted by supcom
Out of curiosity, what characteristic of radial spokes prompted you to mount the sensor on the non-radial side of the wheel?
On the very first ride with the new set-up, I ran into a club member on his ATB training bike. Darned if he didn't have what appeared to be the same magnet attached to one radially laced spoke. He'd had it that way for years. It looked like it could rotate outward and hit the fork, but it hadn't.
I could have done the same, but I didn't really like it. Moving the magnet turned out so neat, that from now on I'm putting it on the rotor side irrespective of the lacing.
Al
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Originally Posted by Al.canoe
My magnet is kinda big, and the holder is obviously designed to be placed at a spoke crossing: there's two grooves and the are angled like the angle of crossing spokes. So I was convinced that just hanging it on one spoke was probably not secure enough.
On the very first ride with the new set-up, I ran into a club member on his ATB training bike. Darned if he didn't have what appeared to be the same magnet attached to one radially laced spoke. He'd had it that way for years. It looked like it could rotate outward and hit the fork, but it hadn't.
I could have done the same, but I didn't really like it. Moving the magnet turned out so neat, that from now on I'm putting it on the rotor side irrespective of the lacing.
Al
On the very first ride with the new set-up, I ran into a club member on his ATB training bike. Darned if he didn't have what appeared to be the same magnet attached to one radially laced spoke. He'd had it that way for years. It looked like it could rotate outward and hit the fork, but it hadn't.
I could have done the same, but I didn't really like it. Moving the magnet turned out so neat, that from now on I'm putting it on the rotor side irrespective of the lacing.
Al
Obviously, if your setup works, all power to you. As I said, I was just curious.
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How about sticking another, possibly stronger, magnet to the existing magnet? You can get some very strong permanent magnets in very small sizes. I'm not sure this would work because I don't know if the pickup requires a certain magnetic field strength but it might be worth a shot.
I have these at home and they would stick to the wheel magnet through just about anything.
I have these at home and they would stick to the wheel magnet through just about anything.
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Might help to post a photo of your current setup for us to examine. Sometimes it's easier to point things out visually rather than verbally.
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Originally Posted by cyccommute
How about sticking another, possibly stronger, magnet to the existing magnet? You can get some very strong permanent magnets in very small sizes. I'm not sure this would work because I don't know if the pickup requires a certain magnetic field strength but it might be worth a shot.
I have these at home and they would stick to the wheel magnet through just about anything.
I have these at home and they would stick to the wheel magnet through just about anything.
Just kidding of course.
Al
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Originally Posted by Al.canoe
...However, the danger is when I passed a steel fence post, I'd collide with it. I have enough trouble peeling myself off of trees! ...
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I also have sigma. Are you using wired or wireless? I have used wireless on 2 mtbs and one road bike. I have used wired on both mtbs but not on the road bike. Both MTBs have front shocks. If you can wait a minute, I'll go look and tell you where they are mounted...
...Sorry I took so long. I decided to take some pix. The ones of the mtbs came out ok, the one of the road bike didn't & I not gonna try again, its cold in the garage.
The first is my bike, the sensor is mounted about 4" from the hub. The second is my son's bike & is mounted just below the brakes (the bike is handing from the ceiling by both wheels). The road bike sensor is also mounted just below the brakes.
I hope this helps!
...Sorry I took so long. I decided to take some pix. The ones of the mtbs came out ok, the one of the road bike didn't & I not gonna try again, its cold in the garage.
The first is my bike, the sensor is mounted about 4" from the hub. The second is my son's bike & is mounted just below the brakes (the bike is handing from the ceiling by both wheels). The road bike sensor is also mounted just below the brakes.
I hope this helps!
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Thanks for the advice. Ritehsedad, thanks for the pics. I'm mounting this on a Catrike Road (tadpole trike) on the rear wheel. Why the rear wheel, well there only one place to mount it on the front wheels and that is the steering arms(I don't think I can keep the sensor stable enough there), the only other place to mount it on the front wheels would be impossibly far away. On the rear wheel is where I get the 20mm no matter where I place the sensor(wired) and magnet.
To the posters who recommend using double sided mounting tape, just how long could I expect this setup to last.
To the posters who recommend using double sided mounting tape, just how long could I expect this setup to last.
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Ha!
I've got your solution!
Sigma has a new magnet called the Power Magnet, "Power magnet is the SIGMA SPORTŪ solution for unusual spokes and distances between the magnet and sensor that are too large Distances of up to 20mm are no longer a problem for the newly developed magnet and it fits all possible types of spokes and diameters."
You can find it at the Sigma Web Site .
I've got your solution!
Sigma has a new magnet called the Power Magnet, "Power magnet is the SIGMA SPORTŪ solution for unusual spokes and distances between the magnet and sensor that are too large Distances of up to 20mm are no longer a problem for the newly developed magnet and it fits all possible types of spokes and diameters."
You can find it at the Sigma Web Site .
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Why isn't 11 pronounced onety one?
Why isn't 11 pronounced onety one?
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Originally Posted by Ritehsedad
Ha!
I've got your solution!
Sigma has a new magnet called the Power Magnet, "Power magnet is the SIGMA SPORTŪ solution for unusual spokes and distances between the magnet and sensor that are too large Distances of up to 20mm are no longer a problem for the newly developed magnet and it fits all possible types of spokes and diameters."
You can find it at the Sigma Web Site .
I've got your solution!
Sigma has a new magnet called the Power Magnet, "Power magnet is the SIGMA SPORTŪ solution for unusual spokes and distances between the magnet and sensor that are too large Distances of up to 20mm are no longer a problem for the newly developed magnet and it fits all possible types of spokes and diameters."
You can find it at the Sigma Web Site .
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"The difference between genius and stupidity is that genius has its limits."
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Boy, is the Sigma web site screwy. I put in my Zip Code and it gives me cities 200 miles away. I put in my town and it gives not found. I key in just WI and it gives me 4 pages worth of dealers in state, including one in town here. Looks like every bike shop in the state sells Sigma stuff.
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Good luck. I think you can actually order directly from Sigma if you need to.
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Why isn't 11 pronounced onety one?
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I'm sure one of the shops in Madison would be a sigma dealer and I know Wheel & Sprocket is.