[monah78]

I have also a Citroen AX (Gasoline MY88 AX 954 cm3) and I want to increase gear Ratio.

I see you change your front Tires from 145/70R13 to 155/80R13. I want to do the same with Toyo NanoEnergy 3 155/80 R13 but I was wondering why only in front ? Do you experience some problems when you turn (Friction of the tire against shape ?
Other point I want to change my current 4 speeds Manual transmission with a 5 Speeds one with longer ratio (I'am looking for a MA5/O from a Peugeot 208 1,4l HDI Blue Lion).
According my caculations with those 2 modifications (tires & gearbox) 1000rpm speed (km/h) will be :
I : 8.62 (12x41*17x61) instead of 7.38
II : 16.28 (21x38*17x61) instead of 13.94
III : 25.13 (29x34*17x61) instead of 22.33
IV : 34.51 (41x35*17x61) instead of 30.98
V : 43.27 (47x32*17x61)

Do you experience some driveability issues with such ratio ?

Thanks by advance for sharing your experience.