chrisg
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| posted on 14/3/06 at 08:45 PM |
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Bike speedo calibration
I've fitted my bike speedo today and the fly in the ointment is that it reads in Kms.
I need to calibrate it now as I'd like miles an hour, I'm pretty sure it's just a matter of putting in an incorrect diameter,
probably a fixed ratio, trouble is I don't know which one!!
are there any mathmeticians that could help me out??
Cheers
Chris
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RazMan
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| posted on 14/3/06 at 09:21 PM |
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If it is any help, 1 mile = 1.60934 Km and 1 Km = 0.62137 miles 
[Edited on 14-3-06 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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chrisg
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| posted on 14/3/06 at 10:13 PM |
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quote:
Originally posted by RazMan
If it is any help, 1 mile = 1.60934 Km and 1 Km = 0.62137 miles
[Edited on 14-3-06 by RazMan]
it could be, to someone who is better at maths than me!
Thanks Mate.
Chris
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RazMan
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| posted on 14/3/06 at 10:28 PM |
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What formula have you used to calculate your existing setup?
You need rotations per mile right? So you take your tyre size and look up the rolling circumference from
here and work out the revs per mile, enter that into your equation and voila!
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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02GF74
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| posted on 15/3/06 at 03:19 PM |
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what speedo is it? i've been through quite a few on various bikes (vetta,shimano,TT + tesco cheapy + other makes that I forget) and usaully
they are reset by holding down buttons or for sure removal of battery.
They step through usualy mph/kmh mode, wheel diameter and time.
If the display is in kmh only, you would need to multiply by 5/8 (approx) so although the display is still in kmh but the figure is in mph.
On bikes I set the diameter by sitting on the bike and rolling forwards 1 revoution - this gives most accurate figure as it takes into account tyre
wall distortion due to rider wieght.
For a car, paint a line across the tyre to which the sensor is at, drive forwards in a straight line 1 wheel revoution then measure distance between
the two lines, divide by pi and there is your diameter!
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