calibrate cycle computer
- HairyMary
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calibrate cycle computer
Postby HairyMary » Sat May 19, 2007 7:43 pm
ive searched for this topic & not really found what i was after so im posting a new thread.
i just bought a cycle computer. im running 26" rims + 1.5" tyres (there about). ive calibrated the computer accordingly + entered the appropriate wheel factor (according to the chart supplied).
the thing is that when it came time for mounting the sensor on the fork & the tracker on the spokes, the instructions contained no detail on how far away from the rim / hub i should place them. to my mind, placing them too close / not far enough would change the distance travelled by the tracker which would then give an inconrrect reading.
my question, therefore is where on the spoke do i place the tracker & the sensor thingo to ensure accurate readings are obtained by the computer?
thanks v much.
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- europa
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Postby europa » Sat May 19, 2007 9:28 pm
Now, talking real world.
You'll probably be forced to place the sensor (and hence the magnet) just clear of the brakes - this is out near the rim. A bit of messing about on your bike will soon show you why you wind up here - that's where the room is. Nor is it unusual to find that to get the magnet on the wheel to actually clear the magnet (as opposed to hitting it), you'll have it twisted on the spoke. This DOES NOT matter.
The sensor is just that, a sensor. Fit it securely and safely ie, you aren't going to go knocking it. The thing that clips to the spoke, no matter what it looks like, is no more than a magnet - it may not look like one depending on the plastic housing the manufacturer has provided. To get accurate and reliable readings, all you need to do is to set the magnet to pass through the centre of the sensor (critical) and as close to it as possible - on two of my bikes, the magnet is clipped to the spoke but angled backwards to allow it to miss the sensor.
Just make it all fit neatly on your bike and it will work. It gets no more complicated than that. Seriously.
Richard
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Postby europa » Sat May 19, 2007 9:59 pm
Getting the magnet to sweep the centre of the censor is more important, and the closer the two pass the better. As long as it's working, it doesn't matter. If it doesn't work (like one of mine didn't the other day), it's a matter of either closing that gap or making sure the magnet passes the centre of the sensor (my Polar cadence meter is particularly sensitive to that though it was my Sigma computer that needed adjustment for this the other day).HairyMary wrote:excelent guys. thanx v much for the help. ive got the magnet set with about 2mm clearance from the sensor and it seems to be working fine
Richard
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- europa
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Postby europa » Sat May 19, 2007 10:14 pm
Richard
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Postby heavymetal » Sun May 20, 2007 10:42 am
Kev.
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Postby mikesbytes » Sun May 20, 2007 11:20 am
But what happens on the corkscrew when he gets a point where the bikes starts to roll backwards?heavymetal wrote:If you fit 2 magnets, you get double your speed That's how Richard gets his high speed readings (I think he may have 4 fitted now).
Kev.
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Postby heavymetal » Sun May 20, 2007 1:17 pm
He gets to hold the world's fastest speed record for a bicycle in reversemikesbytes wrote:But what happens on the corkscrew when he gets a point where the bikes starts to roll backwards?
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re
Postby stated » Sun May 20, 2007 5:41 pm
Richard
Well guess what,
I had a look at the magnets and the cadence sensor was slightly off center, I moved it just 2mm and that fixed it. It now only lags 2-3seconds both ways. Thanks for the advice.
Neb.
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Postby europa » Sun May 20, 2007 5:47 pm
**insert erudite observation I was going to make but can't because I've forgotten what it was**
Richard
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Postby Mulger bill » Sun May 20, 2007 10:41 pm
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Postby Mulger bill » Sun May 20, 2007 10:53 pm
Shaun
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Postby Mulger bill » Sun May 20, 2007 11:14 pm
Shaun
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Postby Mulger bill » Sun May 20, 2007 11:39 pm
Your interview went well I hear?
- HairyMary
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Postby HairyMary » Mon May 21, 2007 7:36 pm
rode to work this morning. 45km there. checked my max speed when i arrived (i know its a bit nggggg but who doesn't check out how fast they've travelled). anyway max speed was something like 50km/h. boo-yaaa!
now this afternoon i rode the same route but backwards, got home & checked my max speed and it was 99.99km/h!!!!! now, i know i was bookin' for a while there because the route has some nice downhill stretches but i couldn't honestly say i was anywhere near hitting 100k an our. how the hell would my max have, well, maxed out like that?
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