Cadence / Magnets

spen666

People in the past have recommended "super" magnets for use with cadence on bikes - think they were bought from Amazon - can anyone remind me what they are called or a link to the seller please


Thanking you all in advance

rolf_f

Neodymium or Rare Earth. Plenty on Ebay.

meanredspider

Neodymium Disc Magnets 12mm dia. x 3mm thick (Pk of 10)...

Seller: dicky5050 ( 26279 )
Seller information: MBF Supplies Ltd
Steven Dickinson
96 Hoyland Road
Sheffield, South Yorkshire S3 8AB UK

£4.98 when I bought them

You can probably go thicker but they stack nicely and simply WON'T budge :shock:

spasypaddy

what size do they need to be?

Thanks MRS

spen666

Thanks - those were the ones I was thinking of

redvee

spasypaddy wrote:

what size do they need to be?

Thanks MRS

Just a little bit smaller than the hole in the crank where the pedals screws in. These magnets only work if you have steel axles in your pedals.

spasypaddy

i have crom-moly on one bike and stainless steel on two others...

meanredspider

Not sure what they are on my Ultegra SPD-SLs but they work fine.

veronese68

spasypaddy wrote:

i have crom-moly on one bike and stainless steel on two others...

Stainless may or may not be magnetic. Depends on the grade.

Clever Pun

Magnets? How do they work?

veronese68

I do believe they work by magic of some sort.

dhope

Veronese68 wrote:

I do believe they work by magic of some sort.

Yep, you're right, it's been proven that it's magic.

spasypaddy

magnets turned up this morning, i just need to move my cadence sensor now and it should work!

rolf_f

spasypaddy wrote:

magnets turned up this morning, i just need to move my cadence sensor now and it should work!

You might not have to move the sensor - they cover quite a distance! Certainly you don't have to worry about aiming the magnet at the mark on the sensor. I just left mine where it already was.

spasypaddy

then i need a new battery instead. will steal one from the office at some point today

rolf_f

spasypaddy wrote:

then i need a new battery instead. will steal one from the office at some point today

Maybe - it depends! Just wave a spare magnet across the sensor to check that the battery works first. The angle of the sensor also has an effect. The range isn't enormous but if the magnet was previously adjacent the spindle then it stands a good chance of working. And if it doens't, doubling up might help.

Oddly, there was no magnet on the spindle of my Ribble the other day. I did swap the pedals recently and haven't used a computer that is set to display cadence on it until this weekend so I might have just put the magnet somewhere. But otherwise it fell off!

tailwindhome

dhope wrote:

Veronese68 wrote:

I do believe they work by magic of some sort.

Yep, you're right, it's been proven that it's magic.

Magic? Don't be ridiculous. Magnets are produced through a specialised mining process which ensures that each extracted magnet retains a little bit of the earth's gravity.

veronese68

TailWindHome wrote:

dhope wrote:

Veronese68 wrote:

I do believe they work by magic of some sort.

Yep, you're right, it's been proven that it's magic.

Magic? Don't be ridiculous. Magnets are produced through a specialised mining process which ensures that each extracted magnet retains a little bit of the earth's gravity.

Duh! Gravity = magic. Didn't you learn nuffink in skool?

spen666

Veronese68 wrote:

TailWindHome wrote:

dhope wrote:

Veronese68 wrote:

I do believe they work by magic of some sort.

Yep, you're right, it's been proven that it's magic.

Magic? Don't be ridiculous. Magnets are produced through a specialised mining process which ensures that each extracted magnet retains a little bit of the earth's gravity.

Duh! Gravity = magic. Didn't you learn nuffink in skool?

All I learned was how to bend not bereak the rule