I've used the Sigma 800 on my Bandit for many thousands of miles with no problems. I bought "rare earth" magnets at an electronics store for less than a dollar and glued them to the front rim with epoxy. I used a nylon tie-wrap to hold the sensor to the fork. By stacking the magnets I got the right gap. The unit was easily calibrated using GPS. Sigma offers a sensor designed to be used on stationary bikes. It has an extra long wire so you don't need to splice the stock sensor.
The whole deal cost less than 30.00 USD.
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