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-   -   Wheel/Spoke Magnets (http://www.cyclebanter.com/showthread.php?t=257416)

Tosspot[_3_] May 12th 19 09:29 AM

Wheel/Spoke Magnets
 
Anyone know of some 'decent' ones. The Sigma supplied ones won't
attract a whore in a crack house. The Bosch type ones always seem to
corrode and fall off, and on top of that are easy to X-Thread. The
Cat-Eye ones don't seem to stay put[1]. The Echowell/Yamaha ones seem
pretty decent but are like rocking horse **** this side of the pond.
Any other ideas?

[1] Yes, it is getting OCD!

John B. Slocomb May 12th 19 11:04 AM

Wheel/Spoke Magnets
 
On Sun, 12 May 2019 10:29:34 +0200, Tosspot
wrote:

Anyone know of some 'decent' ones. The Sigma supplied ones won't
attract a whore in a crack house. The Bosch type ones always seem to
corrode and fall off, and on top of that are easy to X-Thread. The
Cat-Eye ones don't seem to stay put[1]. The Echowell/Yamaha ones seem
pretty decent but are like rocking horse **** this side of the pond.
Any other ideas?

[1] Yes, it is getting OCD!


Glue? Clean the magnet, clamp, and the spoke with some sort of solvent
to remove dirt and oil, anoint with some sort of rubber (or other
flexible) glue, install magnet, tighten clamp, let the glue harden.
--

Cheers,

John B.

SMS May 12th 19 02:27 PM

Wheel/Spoke Magnets
 
On 5/12/2019 1:29 AM, Tosspot wrote:
Anyone know of some 'decent' ones.* The Sigma supplied ones won't
attract a whore in a crack house.* The Bosch type ones always seem to
corrode and fall off, and on top of that are easy to X-Thread.* The
Cat-Eye ones don't seem to stay put[1].* The Echowell/Yamaha ones seem
pretty decent but are like rocking horse **** this side of the pond. Any
other ideas?

[1] Yes, it is getting OCD!


When I lost the cadence magnet on my crank I used a hard-drive magnet,
i.e. https://www.ebay.com/itm/173209158372 but I got some used ones
from someone I knew at a disk drive company. I heat shrinked it over the
crank. I guess for a wheel magnet you could use some cable ties or some
baling wire and attach one of these to the spokes. The pick-up doesn't
have to be so close to the magnet when you use a disk drive magnet.

Tosspot[_3_] May 12th 19 05:21 PM

Wheel/Spoke Magnets
 
On 12/05/2019 15:27, sms wrote:
On 5/12/2019 1:29 AM, Tosspot wrote:
Anyone know of some 'decent' ones. The Sigma supplied ones won't
attract a whore in a crack house. The Bosch type ones always seem
to corrode and fall off, and on top of that are easy to X-Thread.
The Cat-Eye ones don't seem to stay put[1]. The Echowell/Yamaha
ones seem pretty decent but are like rocking horse **** this side
of the pond. Any other ideas?

[1] Yes, it is getting OCD!


When I lost the cadence magnet on my crank I used a hard-drive
magnet, i.e. https://www.ebay.com/itm/173209158372 but I got some
used ones from someone I knew at a disk drive company. I heat
shrinked it over the crank. I guess for a wheel magnet you could use
some cable ties or some baling wire and attach one of these to the
spokes. The pick-up doesn't have to be so close to the magnet when
you use a disk drive magnet.


That's an idea. They have various holes that would take small nuts and
bolts and we get through a lot of disc drives at work.

Mark J. May 13th 19 12:26 AM

Wheel/Spoke Magnets
 
On 5/12/2019 6:27 AM, sms wrote:
On 5/12/2019 1:29 AM, Tosspot wrote:
Anyone know of some 'decent' ones.* The Sigma supplied ones won't
attract a whore in a crack house.* The Bosch type ones always seem to
corrode and fall off, and on top of that are easy to X-Thread.* The
Cat-Eye ones don't seem to stay put[1].* The Echowell/Yamaha ones seem
pretty decent but are like rocking horse **** this side of the pond.
Any other ideas?

[1] Yes, it is getting OCD!


When I lost the cadence magnet on my crank I used a hard-drive magnet,
i.e. https://www.ebay.com/itm/173209158372 but I got some used ones
from someone I knew at a disk drive company. I heat shrinked it over the
crank. I guess for a wheel magnet you could use some cable ties or some
baling wire and attach one of these to the spokes. The pick-up doesn't
have to be so close to the magnet when you use a disk drive magnet.


If heat shrink is too much trouble, the ?vinyl? stretchy plastic
electrical tape works pretty well also, I've done this for cadence
magnets. The tape may start to peel and degenerate into a sticky mess,
but if caught/redone in time, the mess is quite containable.

Mark J.


John B. Slocomb May 13th 19 12:45 AM

Wheel/Spoke Magnets
 
On Sun, 12 May 2019 16:26:11 -0700, "Mark J."
wrote:

On 5/12/2019 6:27 AM, sms wrote:
On 5/12/2019 1:29 AM, Tosspot wrote:
Anyone know of some 'decent' ones.* The Sigma supplied ones won't
attract a whore in a crack house.* The Bosch type ones always seem to
corrode and fall off, and on top of that are easy to X-Thread.* The
Cat-Eye ones don't seem to stay put[1].* The Echowell/Yamaha ones seem
pretty decent but are like rocking horse **** this side of the pond.
Any other ideas?

[1] Yes, it is getting OCD!


When I lost the cadence magnet on my crank I used a hard-drive magnet,
i.e. https://www.ebay.com/itm/173209158372 but I got some used ones
from someone I knew at a disk drive company. I heat shrinked it over the
crank. I guess for a wheel magnet you could use some cable ties or some
baling wire and attach one of these to the spokes. The pick-up doesn't
have to be so close to the magnet when you use a disk drive magnet.


If heat shrink is too much trouble, the ?vinyl? stretchy plastic
electrical tape works pretty well also, I've done this for cadence
magnets. The tape may start to peel and degenerate into a sticky mess,
but if caught/redone in time, the mess is quite containable.

Mark J.


I bonded used Hard disk magnets onto the aluminum crank arms of all of
my (4) bicycles as much as 10 years ago using epoxy glue. To date the
magnets are all still attached :-)

As to the original post, I have spoke magnets that I attached to front
wheels both with radial spokes and with crossed spokes that have been
in place for 4 - 5 years.

What is the big problems with attaching magnets to bicycles?

--

Cheers,

John B.

SMS May 13th 19 01:37 AM

Wheel/Spoke Magnets
 
On 5/12/2019 4:26 PM, Mark J. wrote:
On 5/12/2019 6:27 AM, sms wrote:
On 5/12/2019 1:29 AM, Tosspot wrote:
Anyone know of some 'decent' ones.* The Sigma supplied ones won't
attract a whore in a crack house.* The Bosch type ones always seem to
corrode and fall off, and on top of that are easy to X-Thread.* The
Cat-Eye ones don't seem to stay put[1].* The Echowell/Yamaha ones
seem pretty decent but are like rocking horse **** this side of the
pond. Any other ideas?

[1] Yes, it is getting OCD!


When I lost the cadence magnet on my crank I used a hard-drive magnet,
i.e. https://www.ebay.com/itm/173209158372 but I got some used ones
from someone I knew at a disk drive company. I heat shrinked it over
the crank. I guess for a wheel magnet you could use some cable ties or
some baling wire and attach one of these to the spokes. The pick-up
doesn't have to be so close to the magnet when you use a disk drive
magnet.


If heat shrink is too much trouble, the ?vinyl? stretchy plastic
electrical tape works pretty well also, I've done this for cadence
magnets.* The tape may start to peel and degenerate into a sticky mess,
but if caught/redone in time, the mess is quite containable.


I SPIT on electrical tape.

Tosspot[_3_] May 13th 19 06:06 AM

Wheel/Spoke Magnets
 
On 13/05/2019 01:45, John B. Slocomb wrote:
On Sun, 12 May 2019 16:26:11 -0700, "Mark J."
wrote:

On 5/12/2019 6:27 AM, sms wrote:
On 5/12/2019 1:29 AM, Tosspot wrote:
Anyone know of some 'decent' ones.* The Sigma supplied ones won't
attract a whore in a crack house.* The Bosch type ones always seem to
corrode and fall off, and on top of that are easy to X-Thread.* The
Cat-Eye ones don't seem to stay put[1].* The Echowell/Yamaha ones seem
pretty decent but are like rocking horse **** this side of the pond.
Any other ideas?

[1] Yes, it is getting OCD!

When I lost the cadence magnet on my crank I used a hard-drive magnet,
i.e. https://www.ebay.com/itm/173209158372 but I got some used ones
from someone I knew at a disk drive company. I heat shrinked it over the
crank. I guess for a wheel magnet you could use some cable ties or some
baling wire and attach one of these to the spokes. The pick-up doesn't
have to be so close to the magnet when you use a disk drive magnet.


If heat shrink is too much trouble, the ?vinyl? stretchy plastic
electrical tape works pretty well also, I've done this for cadence
magnets. The tape may start to peel and degenerate into a sticky mess,
but if caught/redone in time, the mess is quite containable.

Mark J.


I bonded used Hard disk magnets onto the aluminum crank arms of all of
my (4) bicycles as much as 10 years ago using epoxy glue. To date the
magnets are all still attached :-)

As to the original post, I have spoke magnets that I attached to front
wheels both with radial spokes and with crossed spokes that have been
in place for 4 - 5 years.

What is the big problems with attaching magnets to bicycles?


It isn't a problem per se. For some reason there is a *big* gap between
the spokes and the Surly LHT frame, which means at best, standard
magnets are intermittent. The fix is obvious, a small neodymium disc
magnet, but this tends to cause enough of some adverse force to cause
the above problems. In short, the Sigma ones don't cut the mustard,
different ones work ok for a year or two. I want a good magnet, that
stays put, doesn't corrode and I can't fyckup fitting.


Andre Jute[_2_] May 13th 19 09:50 AM

Wheel/Spoke Magnets
 
On Sunday, May 12, 2019 at 9:29:37 AM UTC+1, Tosspot wrote:
Anyone know of some 'decent' ones. The Sigma supplied ones won't
attract a whore in a crack house. The Bosch type ones always seem to
corrode and fall off, and on top of that are easy to X-Thread. The
Cat-Eye ones don't seem to stay put[1]. The Echowell/Yamaha ones seem
pretty decent but are like rocking horse **** this side of the pond.
Any other ideas?

[1] Yes, it is getting OCD!


Having a problem with the Sigma magnet is odd. I have no problem problem with a Sigma magnet that has outlived two Sigma bike computers and hasn't moved from where I fixed it in over ten years. A little thought tells me this is probably because my spokes are the Sapim Strong, thicker than the weightweenie "racing" spokes the clamp might have been designed for. Inspection will probably show you where you can file the clamping bit to make its legs shorter so it clamps harder. Or a small gobbet of glue inside the closed clamp, then reamed or drill to spoke size may do the business, or even simply a gob of glue on the spoke just below the clamp might stop it sliding away if the problem is indeed that it slides away.

If your problem is that the magnet won't stay at the angle to which you twisted it to meet your other problem, of the wide space between the Surly fork blades try moving the sender and the magnet up towards the crown so that they come closer together and the magnet can be fitted flatter to the spoke, before you try the additional remedies above.

Andre Jute
It isn't a bodge until it is required to do two jobs at once

John B. Slocomb May 13th 19 11:46 AM

Wheel/Spoke Magnets
 
On Mon, 13 May 2019 07:06:48 +0200, Tosspot
wrote:

On 13/05/2019 01:45, John B. Slocomb wrote:
On Sun, 12 May 2019 16:26:11 -0700, "Mark J."
wrote:

On 5/12/2019 6:27 AM, sms wrote:
On 5/12/2019 1:29 AM, Tosspot wrote:
Anyone know of some 'decent' ones.* The Sigma supplied ones won't
attract a whore in a crack house.* The Bosch type ones always seem to
corrode and fall off, and on top of that are easy to X-Thread.* The
Cat-Eye ones don't seem to stay put[1].* The Echowell/Yamaha ones seem
pretty decent but are like rocking horse **** this side of the pond.
Any other ideas?

[1] Yes, it is getting OCD!

When I lost the cadence magnet on my crank I used a hard-drive magnet,
i.e. https://www.ebay.com/itm/173209158372 but I got some used ones
from someone I knew at a disk drive company. I heat shrinked it over the
crank. I guess for a wheel magnet you could use some cable ties or some
baling wire and attach one of these to the spokes. The pick-up doesn't
have to be so close to the magnet when you use a disk drive magnet.

If heat shrink is too much trouble, the ?vinyl? stretchy plastic
electrical tape works pretty well also, I've done this for cadence
magnets. The tape may start to peel and degenerate into a sticky mess,
but if caught/redone in time, the mess is quite containable.

Mark J.


I bonded used Hard disk magnets onto the aluminum crank arms of all of
my (4) bicycles as much as 10 years ago using epoxy glue. To date the
magnets are all still attached :-)

As to the original post, I have spoke magnets that I attached to front
wheels both with radial spokes and with crossed spokes that have been
in place for 4 - 5 years.

What is the big problems with attaching magnets to bicycles?


It isn't a problem per se. For some reason there is a *big* gap between
the spokes and the Surly LHT frame, which means at best, standard
magnets are intermittent. The fix is obvious, a small neodymium disc
magnet, but this tends to cause enough of some adverse force to cause
the above problems. In short, the Sigma ones don't cut the mustard,
different ones work ok for a year or two. I want a good magnet, that
stays put, doesn't corrode and I can't fyckup fitting.


I think that you are referring to a cycle meter pickup - spoke magnet
and sensor mounted on the front fork? What I do is mount the magnet
and than mount the sensor with a bit of offset - bent in, one might
say. Works for me :-)

The indomitable Sheldon recommends installing the magnet as near the
hub as possible as it means that the magnet passes the sensor
(transmitter) slower which he feels might make things more accurate.

As an aside, it also means that the magnet is closer to the fork tube
and therefore the sensor is closer to the magnet and requires less
offset. See https://www.youtube.com/watch?v=q-eGGDFeaUM
for an example (I know it is a cabled meter but the position of the
sender is the same as a wireless sensor).

--

Cheers,

John B.


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