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| Fitting bicycle speedo | |
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| Tweet Topic Started: Feb 9 2012, 05:55 PM (1,436 Views) | |
| RudiRulez | Feb 9 2012, 05:55 PM Post #1 |
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The Boss
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Maybe your speedo is broken or maybe you just fancy a change, either way this is how I fit mine. This is the speedo im using: Raleigh 9 Function ARC006 , Paid £6 on ebay. First up, remove the plastic holder from the magnet and insert into one of the holes on the front disc, I used a little packing to make it sit flush and some glue to hold it better. ![]() Next mount the holder and computer onto the bars using cable ties, The ones supplied were abit on the skinny side so instead I used some fatter ones. ![]() Routing the cable is nice and simple, the sensor just about fits through the brake line guides and has just enough cable to reach where we need it to go when the suspension is fully extended. ![]() ![]() ![]() Mounting the sensor is easy too, just get it roughly in position so the magnet passes the lower half of the sensor when the wheel is span and loosely cable tie it there, now you have to get the sensor as close as you can to the magnet but they can not touch each other (the maximum distance for the sensor to still pickup the magnet is 2mm), once all positioned properly tighten up the cable ties. ![]() Once thats all done its time to work out the magic number to get the speedo to read correctly, in theory a 150/60-17 tyre will travel 1922mm each revolution so 1922 is what i've entered, however tyre wear and preassure can impact this so its better to measure you wheel circumfrence by rolling it forward 1 revolution and measuring the distance travelled with a tape measure. Job done, the way the magnet fitted and the length on cable supplied almost makes me think it was designed for our bikes! BE WARNED, Im yet to test this, ive span the wheel in free air and it worked perfectly however on the road it may be a different story, also im a little worried about the position of the sensor as im not entirely sure how far the forks will travel if they travel too far the top half of the forks may collide with the sensor! |
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| ccm les | Feb 9 2012, 07:36 PM Post #2 |
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Commoner
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Looks a good idea, hope it works as my speedo is knackered as well! Keep us updated please. |
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| Monty | Feb 9 2012, 08:30 PM Post #3 |
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Charlie Big Banana's
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Very simular as just fitted a £4.50 one to the CR, had to fab a bracket to hold sensor but I'm sure every bike is different. Very simple to do, tho be warned some units have preset circumferences built in, last one I fitted would not let me anywhere near the correct circumference, speedo read twice what I was doing. looked good when you hit max speed button |
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If it aint sharp I can play with it My Utube Channel, lots of bike vids here. Subscribe if you likehttp://www.youtube.com/user/choppermark?feature=watch
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| bighit | Feb 9 2012, 08:56 PM Post #4 |
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outta here
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the guy that had the 644 i have before me had fitted the sensor onto the fork guard ( the bottom guard the silver one in your picture) was not on the bike when i got it so cant say if it worked well |
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| RudiRulez | Feb 9 2012, 09:16 PM Post #5 |
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The Boss
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No worries, this one is very adjustable, it appears the circumfrence range is from 0 to 5999mm quick calculation makes that 0" to 75" diameter. Ive just bought some better magnets that ill be fitting when they arrive, and ill be fitting 2 instead of 1 to keep the wheel balance and make it more accurate, if I halve the circumfrence in the setting it should still read correctly. |
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| Monty | Feb 9 2012, 09:36 PM Post #6 |
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Charlie Big Banana's
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I doubt very much if you will notice the wheel out of balance with one magnet, The nearer the centre the better. did you buy earth magnets, I had 10 several years ago and now down to about 4, use them on all my toys |
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If it aint sharp I can play with it My Utube Channel, lots of bike vids here. Subscribe if you likehttp://www.youtube.com/user/choppermark?feature=watch
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| RudiRulez | Feb 10 2012, 03:50 PM Post #7 |
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The Boss
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I thought the same too, but better to be safe than sorry. I bought some neodymium(spelling?) apperently one of the strongest types of magnet, i got one with countersunk holes in them so i can bolt them onto the disc for extra security. |
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| madasabicycle | Feb 10 2012, 06:00 PM Post #8 |
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Baron
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I used a Mach1 bicycle speedo on mine for a couple of years, worked very well. I fitted the sensor to the fork guard and attached a kitchen cupboard magnet to the hub with chemical metal. |
CCM 644 DS All the usual Mods
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| Monty | Feb 10 2012, 07:01 PM Post #9 |
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Charlie Big Banana's
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If it aint sharp I can play with it My Utube Channel, lots of bike vids here. Subscribe if you likehttp://www.youtube.com/user/choppermark?feature=watch
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| RudiRulez | Feb 10 2012, 07:15 PM Post #10 |
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The Boss
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Heat works a treat at getting them off, we got one to hold the oven door closed as the springs are knackered, by chance we found out that its pretty much useless once the ovens been on for 30mins or so, as soon as it cools down again its fine. |
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| RudiRulez | Feb 14 2012, 09:35 PM Post #11 |
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The Boss
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Update: I've changed from the crappy iron magnet they supply to an earth magnet with a countersunk hole and i've attached it with a bolt so it's deffinatley not going to fly out at 70mph and hit me in the eye.
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