Glue that can withstand the heat of a brake rotor

[Macstar]

Do you have a link for your speedo... my search had alot of scooter stuff ??

This guy sells my Speedo:

http://www.dirtbike.co.nz/default.asp?pageid=12#

(Koso Digital Speedo/Trip/ODO)

I bought mine from Cycletreads on Auckland's Northshore for $110 though... The speedo looks cool with the blue LED light background, and the digital display is large enough to read with average eyesight abilities!

The Koso comes only with an adhesive pad for mounting however, so i had to make up an alluminium mounting plate to stick it to.

[Daffyd]

I was always taught in electrical class that heat destroys magnets.

[Pancakes]

Nothing theoretically wrong with any of those options apart from
1. Push bike speedo wheel circumference didnt divide down that far.
2+3. Would all have needed external power, and not readily available off the shelf.
But granted extra sensors could be the go, however the upper speed range of most pushbike speedos is 200k's, the limit I figure being something to do with how fast the reed switches can operate. If you have more sense points this would reduce the max speed.

Your right, I just threw in my 2c and thought it might help spur on other peoples brain juice. Get a bit lateral ya know....

I was always taught in electrical class that heat destroys magnets.

Doesn't destroy them, the heat excites the molecules and randomises the spin/their alignment. It will realign as the magnet cools in the vast majority of instances. Takes bugger all to switch those reeds tho and there are some high quality magnets out there.


PS, my bike speedo reads accurately up to 300KPM and has a second cadence input. Won't be going 300 on the pushie anytime soon!!

[Pixie]

Nothing theoretically wrong with any of those options apart from
1. Push bike speedo wheel circumference didnt divide down that far.
2+3. Would all have needed external power, and not readily available off the shelf.
But granted extra sensors could be the go, however the upper speed range of most pushbike speedos is 200k's, the limit I figure being something to do with how fast the reed switches can operate. If you have more sense points this would reduce the max speed.

Block off one end of one of the large rivets that allow the disc to float on it's carrier.Fill blocked rivet with silicone RTV.Imbed magnet into silicone surface.

The max speed readings on some cyclo computers I have seen go beyond 400 km/hr. the rate at which a reed switch can cycle is beyond this rate by several factors.