I am building up a Raleigh twenty as a fixed gear commuting bike for winter. As it is going to be for winter I am putting a hub dynamo on the front. The dynamo will either be a S-A Dynohub or a Shimano DH3N20 dynamo hub. I want to run a basic computer so that I can accurately log my distance and speed. Will the magnets in the hubs interfere with the computer sensor?