Computers & Hub Dynamos?
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Computers & Hub Dynamos?
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?
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Not being familiar with the product here's my question - does the dynamo go only on the front wheel? If so can you place your sensor for the computer on the rear?
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Originally Posted by gnome
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?
Changing the subject slightly.... I built up a Raleigh Twenty using the new Sturmey Archer dynamo hub / drum brake combination, which is nice because it's hard to put decent caliper brakes on the R20's fork. If you don't already have the hub you're going to use, check it out:
https://aebike.com/page.cfm?PageID=30...ils&sku=HU2200
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Originally Posted by gnome
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?
I've heard of flakiness with wireless computers as interference can cause the computer to either stop registering your speed or tell you that you're going 50 mph while stopped at a red light; but that can occur even if you don't have a dynamo. I don't know if adding a dynamo will increase the likelihood of that, but I've never had a problem with a wired bike computer.
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Peter White's web site claims that you can use the hub dynamo in place of the wheel magnet to provide data to your computer, which seems like a pretty elegant solution to the problem.
Considering how close I have to keep the wheel magnet to the sensor to get my bike computer to work, it should be pretty easy to mount the computer pieces far enough away from the hub generator to eliminate interference. I have a Schmidt hub generator on one bike and a Shimano 3N-71 hub generator on another bike, with computer sensors on the back wheels of each bike, and there's never been a problem.
Considering how close I have to keep the wheel magnet to the sensor to get my bike computer to work, it should be pretty easy to mount the computer pieces far enough away from the hub generator to eliminate interference. I have a Schmidt hub generator on one bike and a Shimano 3N-71 hub generator on another bike, with computer sensors on the back wheels of each bike, and there's never been a problem.
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Originally Posted by markf
Peter White's web site claims that you can use the hub dynamo in place of the wheel magnet to provide data to your computer, which seems like a pretty elegant solution to the problem.
Considering how close I have to keep the wheel magnet to the sensor to get my bike computer to work, it should be pretty easy to mount the computer pieces far enough away from the hub generator to eliminate interference. I have a Schmidt hub generator on one bike and a Shimano 3N-71 hub generator on another bike, with computer sensors on the back wheels of each bike, and there's never been a problem.
Considering how close I have to keep the wheel magnet to the sensor to get my bike computer to work, it should be pretty easy to mount the computer pieces far enough away from the hub generator to eliminate interference. I have a Schmidt hub generator on one bike and a Shimano 3N-71 hub generator on another bike, with computer sensors on the back wheels of each bike, and there's never been a problem.
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I have three bikes with Shimano dynamo hubs and computers, never had any issue.
Unrelated to the dynamo hub, one of my computers is very picky about the alignment between the magnet and pickup. If either gets knocked out of place much the computer will not receive data. I happened to have some quite strong, small rare earth magnets; placing one on the wheel magnet effectively boosted its signal and the pickup's reception is much better.
Unrelated to the dynamo hub, one of my computers is very picky about the alignment between the magnet and pickup. If either gets knocked out of place much the computer will not receive data. I happened to have some quite strong, small rare earth magnets; placing one on the wheel magnet effectively boosted its signal and the pickup's reception is much better.
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Also no problems with a Sturmey Archer DynoHub & front wheel magnet/sensor setup on a wired computer
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Thanks for the help
Thanks for the help. Now I just have to build the bike before winter is over.
Does anyone have any recomendations on what light I should get to go with the dynamo hub? I have settled on using my Shimano hub.
Does anyone have any recomendations on what light I should get to go with the dynamo hub? I have settled on using my Shimano hub.
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I like my B&M Lumotec Senso Plus. I have the oval one. It will stay lit for about 2 minutes after you stop pedaling.
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