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Discussion Starter · #1 · (Edited)
I just finished installing the Sigma Sport BC1200 bike computer. I made a small mounting plate for the computer and my small outside temp gauge. After getting it all on and programmed with the correct wheel size I was able to check out the stock speedo. With the stock speedo reading 80 the bike computer was reading about 76 if I remember right, that sounds about right. I am sure I will change the stock gearing soon, 15 tooth on order, so the stock one will be off even more.

I like this thing because it will track current speed, top speed, average speed, trip distance, riding time plus some other stuff I do not care about.

It is worth the info to me plus I get a true mph reading. I bought this one for $29.99, cheaper fix than the other speedo reprogram stuff.
 
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Discussion Starter · #2 ·
I am both a mountain and road cyclist, but have not used one of these units for awhile - I forget how high (mph) they will register. Definitely much cheaper than a speedo correction unit, but how do you know when you have the true speed dialed in? :idunno:
 
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Discussion Starter · #3 ·
Bacchus said:
I am both a mountain and road cyclist, but have not used one of these units for awhile - I forget how high (mph) they will register. Definitely much cheaper than a speedo correction unit, but how do you know when you have the true speed dialed in? :idunno:
Don't know about mph but they read up to 300kph so I'm guessing 200mph.
To calibrate you measure your tyre circumference and key it in to the sigma. It just counts revolutions. It wouldn't account for tyre growth at speed or reduced circumference when cranked over but then neither does the stock speedo.
 
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Discussion Starter · #4 ·
Good points RP! I'd forgotten that the bicycle 'puters read that high! :eek: And were as programmable as they are. Could probably get one to be fairly accurate, at a much reduced price from a motorcycle oriented "speedo calibrator". :thumb:
 
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Discussion Starter · #5 ·
Yeah I've got one I used to have on my VFR before it got written off. I haven't bothered putting it on the 954 yet. One thing I really liked about it was being able to ride through speed traps or along side a cop and be supremely confident of my speed. They are handy on the track too for max speed and approximate lap times. You just set the stopwatch going at the beginning of the session and you can do mental maths to get your lap time.
 
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Discussion Starter · #6 ·
Maybe I should have said a more accurate reading than the stock unit as I do not think you can ever get it to 100%.
 

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I've had good luck with the BC800's on several bikes. If I remember right, they are accurate to 183MPH. I have one on the RC30, and also the RC45. I even put one on my YSR50/200 because the stock speedo only goes to 50! Once I get my '04 'blade I'll put one on it, too. Calibration is easy, use the measurements to get it close. The easiest way to get it EXACTLY nailed down is to stop at a milemarker on the highway, reset the tripmeter, then ride for at least 20 miles or so, then compare your tripmeter to the actual distance traveled. Since speed measurement is just a function of distance/time, once you get the WS set right, you're done and it's damn near 100% accurate.

Brian
 
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Discussion Starter · #9 ·
That can come in pretty handy if you want to keep track of lots of different type of info. I use to use one of those on my cannondale and loved the thing to death. Of course it was an older version that could only do speed and max speed but it gets the job done.

Might have to pick me up one of these new units. Anyone know an online place to get one?
 
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Discussion Starter · #12 ·
RPinOZ said:
Don't know about mph but they read up to 300kph so I'm guessing 200mph.
To calibrate you measure your tyre circumference and key it in to the sigma. It just counts revolutions. It wouldn't account for tyre growth at speed or reduced circumference when cranked over but then neither does the stock speedo.
A good way to do this is to mark chalk on the side of the tyre then the ground, and then wheel your bike so it's done 3 or 4 revolutions forward, mark again, then measure along the ground, divide by 3 or 4 etc. This reduces the error greatly and gives you a pretty accurate rolling circumference of the tyre. I guess you're only limited by your tape measure and how far you can roll your bike!
 
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Discussion Starter · #13 ·
I am going to order me one later on... It will be nice to have a second setup for those long rides. It kind of sucks on a long ride only having 1 trip counter b/c I use that one to keep track of the total distance and then the whole gas mileage has to be calculated and remembered from there. Plus a second view of just how fast you are going is kind of handy on those long interstate runs :thumb:
 
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Discussion Starter · #14 ·
Dragger said:
I just finished installing the Sigma Sport BC1200 bike computer. I made a small mounting plate for the computer and my small outside temp gauge.
Nice setup. Does the temp guage have a remote sensor? I had a temp sensor near that area but it picks up a lot of engine heat.
 
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Discussion Starter · #15 ·
I just picked up a "SIGMA SPORTS 1600 W/CADENCE" off ebay for $26 to my door. One more toy to play with for now :smilebig:
 
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Discussion Starter · #16 ·
TGZ13 said:
I just picked up a "SIGMA SPORTS 1600 W/CADENCE" off ebay for $26 to my door. One more toy to play with for now :smilebig:
Hehe, cadence. Now you can count the total number of large bumps on your trips too!
 
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Discussion Starter · #20 ·
FuTAnT said:
A good way to do this is to mark chalk on the side of the tyre then the ground, and then wheel your bike so it's done 3 or 4 revolutions forward, mark again, then measure along the ground, divide by 3 or 4 etc. This reduces the error greatly and gives you a pretty accurate rolling circumference of the tyre. I guess you're only limited by your tape measure and how far you can roll your bike!

Actually I'd say the greatest limiting factor with this mob is how high they can count the revolutions, 3 or 4 I think you're being generous.


:D
 
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