Does anyone make a rotor with "KTM style" magnet holder?

[GGRider01]

I'm currently running a modified 320mm rotor on the front. I'm using a Endurance II computer that came with 2 types of magnets. One with circlips for KTMs and one that is meant to be glued to the side of the rotor. There was no way I could glue it to the rotor and have clearance by the caliper bracket, so I drilled a hole and epoxied it into the rotor, flush.

It's only a matter of time before I whack this big ol' thing on a rock so I'd like to get a stock sized rotor that can run the KTM style magnet and it will always be in the same place when I replace the rotor some day. That and I won't have to modify the rotor again. The hard part will probably be getting this speedometer pickup in the right place after that.

Attached picture is a screenshot I took of an eBay listing for a wheel off of a gasgas.. so they exist, I just can't find a new one.

 

[andykr87]

I feel your pain. I just rigged up a 08 ktm speedo/odo. Mounted it to my flexbars and drilled my rotor like the pic ypu have above. But... I did sone measuring and my magnet is 1/4" further out on the rotor than the ktm magnet. Im not sure were the ktm sensor is in relation to my gasgas but i doubt it rrads correct unless its a universal distance around one revolution. Im sure i cant recalibrate it. It mounted up so nicely i hope it does. Whats a good simple trail tech? And i guess with our gassers you glue there magnet on?

 

[pscook]

I feel your pain. I just rigged up a 08 ktm speedo/odo. Mounted it to my flexbars and drilled my rotor like the pic ypu have above. But... I did sone measuring and my magnet is 1/4" further out on the rotor than the ktm magnet. Im not sure were the ktm sensor is in relation to my gasgas but i doubt it rrads correct unless its a universal distance around one revolution. Im sure i cant recalibrate it. It mounted up so nicely i hope it does. Whats a good simple trail tech? And i guess with our gassers you glue there magnet on?

One revolution is one revolution - distance from axle center doesn't matter as long as you have the correct circumference of the tire. The Trailtech and other magnet sensor speedos measure the RPM X distance traveled by the circumference of the tire. Your magnet could be mounted on the rim and it would still read "X" revolutions per minute, then multiply that number by the circumference, and there you have speed over ground.

 

[andykr87]

Thats awesome news. I wanted to write up a small post and take sone pics if it works out good. Everything was free from a buddy so I figured it was worth a try.

 

[GGRider01]

And i guess with our gassers you glue there magnet on?

You're supposed to, but I don't see how it would clear the caliper bracket.

I guess I'll get a rotor with enough meat to drill a hole in, take an end mill bit and countersink the hole so these circlips can snap in place - the rotor is too thick otherwise. I just drilled a hole in this one and epoxied the magnet flush. I had to epoxy it because my first hole wasn't close enough to the pickup so I wallowed it out a bit.