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[Entwood]

                          diameters                    Circumferences

205*55*15           >> 647.5 mm                2034.2 mmm
225*55*16           >> 653.9 mm                2054.3 mm
                               --------                   ----------
                                  +6.4 mm                  20.1 mm

    at 80 km/h

 80,0000 meters / 3600 sec  = 22.222 m/sec =22222 mm/sec

                        
205*55*15  >>>  10.924 turns /sec

225*55*16   >>> 10.817 turns / sec   :-?

which is quite different.. :-/
        

5/10 Must try harder

The 15" standard tyre is 205 65 15, look up the circumference for that and it should be very close to that of the 225 55 16

That makes far more sense ...  I can't see Vx fitting a spare that is so different to the "normal" tyre.

I "believe" one of the reasons for the difference in size is not just the "hole" it fits into .. but the fact that it was designed that way as the cost of alloy wheels in those days was quite high .. so a steel wheel with a different profile tyre was much cheaper than an alloy spare + normal tyre .. and the storgae area was designed around that. The spare is then "thinner" so gives more boot space ...

[cem_devecioglu]

                          diameters                    Circumferences

205*55*15           >> 647.5 mm                2034.2 mmm
225*55*16           >> 653.9 mm                2054.3 mm
                               --------                   ----------
                                  +6.4 mm                  20.1 mm

    at 80 km/h

 80,0000 meters / 3600 sec  = 22.222 m/sec =22222 mm/sec

                        
205*55*15  >>>  10.924 turns /sec

225*55*16   >>> 10.817 turns / sec   :-?

which is quite different.. :-/
        

5/10 Must try harder

The 15" standard tyre is 205 65 15, look up the circumference for that and it should be very close to that of the 225 55 16

my  mistake all my calculations are based on 205 65 15  but I write it wrong

and definitely if you use that spare on the front the car wont go straight ..

[Vamps]

                          diameters                    Circumferences

205*55*15           >> 647.5 mm                2034.2 mmm
225*55*16           >> 653.9 mm                2054.3 mm
                               --------                   ----------
                                  +6.4 mm                  20.1 mm

    at 80 km/h

 80,0000 meters / 3600 sec  = 22.222 m/sec =22222 mm/sec

                        
205*55*15  >>>  10.924 turns /sec

225*55*16   >>> 10.817 turns / sec   :-?

which is quite different.. :-/
        

5/10 Must try harder

The 15" standard tyre is 205 65 15, look up the circumference for that and it should be very close to that of the 225 55 16

That makes far more sense ...  I can't see Vx fitting a spare that is so different to the "normal" tyre.

I "believe" one of the reasons for the difference in size is not just the "hole" it fits into .. but the fact that it was designed that way as the cost of alloy wheels in those days was quite high .. so a steel wheel with a different profile tyre was much cheaper than an alloy spare + normal tyre .. and the storgae area was designed around that. The spare is then "thinner" so gives more boot space ...

I must re check the spare in our Mig, I am sure it is an unused full size alloy, on a 1998 GLS estate . Been a while since I looked

[cem_devecioglu]

                          diameters                    Circumferences

205*55*15           >> 647.5 mm                2034.2 mmm
225*55*16           >> 653.9 mm                2054.3 mm
                               --------                   ----------
                                  +6.4 mm                  20.1 mm

    at 80 km/h

 80,0000 meters / 3600 sec  = 22.222 m/sec =22222 mm/sec

                        
205*55*15  >>>  10.924 turns /sec

225*55*16   >>> 10.817 turns / sec   :-?

which is quite different.. :-/
        

                 diameters                    Circumferences

205*65*15           >> 647.5 mm                2034.2 mmm
225*55*16           >> 653.9 mm                2054.3 mm
                               --------                   ----------
                                  +6.4 mm                  20.1 mm

    at 80 km/h

 80,0000 meters / 3600 sec  = 22.222 m/sec =22222 mm/sec

                        
205*65*15  >>>  10.924 turns /sec

225*55*16   >>> 10.817 turns / sec  
corrected!

[Entwood]

Mine is certainly a "steely"  .. I'll check the size tomorrow  ...

In the meantime  ... this site might save some overheating calculators ...

http://www.tyresave.co.uk/tyresize.html

[cem_devecioglu]

Mine is certainly a "steely"  .. I'll check the size tomorrow  ...

In the meantime  ... this site might save some overheating calculators ...
http://www.tyresave.co.uk/tyresize.html

 

I used that link

http://www.miata.net/garage/tirecalc.html