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Unread 12-25-2013, 10:03 AM   #11
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Default Re: $3 speedometer miles/metric

I've used them on two carts. One with 22" and one with 23" tires. The manual has a chart all the way down to 20", but I think it actually goes lower than that.
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Unread 12-25-2013, 11:26 AM   #12
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Default Re: $3 speedometer miles/metric

Agreed it does go lower then the chart but it doesn't go down to a 8" wheel. The wheel size matters more then the tire size because that's where the magnet goes.
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Unread 12-25-2013, 12:28 PM   #13
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Default Re: $3 speedometer miles/metric

Wow , I just actually read the instructions on mine and it states that "the circumference varies 10cm~239cm, by default the screen display is set at 208cm. A 10cm circumference ! That's like , a 3cm dia. or just under 2" ! I thought it was a typo and was in fact having trouble actually operating this thing at all according to the instructions but yes , in fact it will accept a specification of 10cm in circumference . Apparently then one could even put this on a baby buggy, lawnmower , hovercraft contact wheel or some skateboards or something. I'm guessing you can place the magnet anywhere along the spokes if the sensor counts the number of impulses in a given period which means it doesn't matter if it's mounted mounted very close to the axle or far away
Anyway the Dollarama ( that's actually what it's called up here ) has the bikerama 8 function computer . The number on this one is 14-3023648 . I'm thinking 2 part epoxy to hold the magnet to the rim .
Cheers , Peace and Good Will To All !!

Last edited by Shakey; 12-25-2013 at 12:36 PM.. Reason: thought about it
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Unread 12-25-2013, 01:39 PM   #14
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Default Re: $3 speedometer miles/metric

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Originally Posted by sportcoupe View Post
Agreed it does go lower then the chart but it doesn't go down to a 8" wheel. The wheel size matters more then the tire size because that's where the magnet goes.
Its the circumference that matters. No matter where you mount the magnet, on any size rim, it still only triggers once per revolution.
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Unread 12-25-2013, 02:58 PM   #15
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Default Re: $3 speedometer miles/metric

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Originally Posted by 1989Marathon View Post
Its the circumference that matters. No matter where you mount the magnet, on any size rim, it still only triggers once per revolution.
True but the time between triggers is what the computer uses to determine mph. The point where the magnet is placed is pretty critical to an accurate speedometer. I have used the cheap bike speedometers on golf carts several times and I was unable to adjust the unit low enough for a stock 8" wheel with magnet on the lip of rim where I could with a 12" wheel.
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Unread 12-25-2013, 02:59 PM   #16
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Default Re: $3 speedometer miles/metric

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Originally Posted by Shakey View Post
Wow , I just actually read the instructions on mine and it states that "the circumference varies 10cm~239cm, by default the screen display is set at 208cm. A 10cm circumference ! That's like , a 3cm dia. or just under 2"
That's a rare one. Care to share the make and model number?
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Unread 12-25-2013, 03:04 PM   #17
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Default Re: $3 speedometer miles/metric

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Originally Posted by sportcoupe View Post
True but the time between triggers is what the computer uses to determine mph. The point where the magnet is placed is pretty critical to an accurate speedometer. I have used the cheap bike speedometers on golf carts several times and I was unable to adjust the unit low enough for a stock 8" wheel with magnet on the lip of rim where I could with a 12" wheel.
The time between triggers depends on rpm alone. Not wheel size.
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Unread 12-25-2013, 04:00 PM   #18
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Default Re: $3 speedometer miles/metric

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Originally Posted by 1989Marathon View Post
The time between triggers depends on rpm alone. Not wheel size.
Not hardly. A 100" wheel turning 100 rpm's the speed difference at 2" from center and 100" from center is dramatically different. It has to be because the distance traveled is much greater 100" from center then 2".

I may not be able to explain as good as JohnnieB but what I am saying is correct.
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Unread 12-25-2013, 04:03 PM   #19
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Default Re: $3 speedometer miles/metric

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Originally Posted by sportcoupe View Post
Not hardly. A 100" wheel turning 100 rpm's the speed difference at 2" from center and 100" from center is dramatically different. It has to be because the distance traveled is much greater 100" from center then 2".

I may not be able to explain as good as JohnnieB but what I am saying is correct.
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Unread 12-25-2013, 05:50 PM   #20
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Default Re: $3 speedometer miles/metric

You are correct that the magnet is moving faster,but the time between triggers is still the same. Out at 100", it just has to move faster to get one revolution in the same amount of time.
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