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GT Autotronics &
2-way Comms

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Changing Your Wheels or Tyre Size Can Make a Difference

But Not Always

Working It Out for Yourself

Working It Out for Yourself

Changing your wheel size or tyre size can change how your taximeter calculates the price, but if the diameter of the tyre is the same, then it wont.


Its the diameter of the tyre that matters.

Working It Out for Yourself

Working It Out for Yourself

Working It Out for Yourself

This shows your tyre size and wheel size it fits.


Proper confusing as its a mixture of metric and imperial.


Here 225, is tyre width in metric


50 is tyre profile worked out by a crazy formula.


17 is the wheel size in imperial

How to Do It

Working It Out for Yourself

the Sums for "D"

A= the 225

B= the 50

C=the 17

D=what we need to know


the Sums for "D"

Are Your Ds The Same?

the Sums for "D"

D is the Diameter


D= this formula

D=2X(A/25.4)X(B/100)+C


D in this case is

D=2X(225/25.4)X(50/100)+17

D=26

Are Your Ds The Same?

Are Your Ds The Same?

Are Your Ds The Same?

If your new Diameter is the same as your old Diameter then all is OK


If its NOT then your taximeter NEEDS recalibrating.

Contact Us ASAP

Are Your Ds The Same?

Are Your Ds The Same?

If you don't recalibrate the the taximeter , you could be breaking the law.


So its in your own interest to do this before you are reported  for charging the wrong price and possibly lose your taxi licence.

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