Eng Keat Motor               
                                                                          Service Quality is Our First Priority            

 

Plus Size Tyre and Speedometer

Speedometer is calibrated based on factors of final gear ratio and size of the tyre. The speedometer not only reads on how fast your tyre spinning - revolutions, but also the distance around the tyre - circumference.

Thus, the bigger the tyre size and the diameter would drive you to a longer distance than your speedometer shown.

Diameter of tyre size "195/50R15" = 2*195*50/100)+(15*25.4)
                           =  576.07 mm (22.680 in),
Circumference        =  1,809.55    (71.242 in) > 552.29 Rev / km

Diameter of tyre size "205/45R16" = 2*205*(45/100)+(16*25.4)
                           =  590.91 mm (23.264 in),
Circumference        =  1,856.38    (73.086 in) > 538.37 Rev / km

 

Tyre Tread width, aspect ratio and Tyre Diameter in Inches

  RIM Diameter = 15"

 Aspect
Ratio

 165

175

 185

195

 205

 << Width

 45

 

 

 

 21.91

 22.26

 

 50

 

 

 22.28

 22.68

23.07 

 

 55

 22.15

22.58 

 23.01

 23.45

23.88

 

 60

 22.80

 23.27

 23.74

 24.21

24.69 

 

 65

 23.45

 23.96

 24.47

 24.98

 

 

 70

 24.10

 24.65