i wonder if there is anyone who has a 306 with higher readin speedometer mine is an Nreg 96 diesel with electronic pickup to the clock, the clock shows 43mph but i'm only doing 30 mph and if i travel an 11 mile jurney the clock shows 15 miles, ihave 175 75R 13 tyres i dont think the gearbox has been swaped but i cant be shure i have had the tape measure round the tyres and it shows 5ft
10.5inch or 70 and a half inch , i measured a 14 inch tyre that was i65 65R 14 and found it to show the exact same circumference as my 13 tyre can anyone tell me if the 185 65 R 14 tyre is more than 70 and a half inch round, or offer any reasons for the speedo being fast,,,,,, the speedo is operating in a smooth way and i would think it is ok itself,thanks for your time brian,,,