The Dispatch | Expert | Scudo Hub

I've seen your front conversion and saved it for later, now I'd like to have the middle. i.e. 2nd row quick release type single seats from Ulysse eetc. – my current set (removed on the picture) bolts down to the floor – you can see the holes on the photo. Only rear bench has the quick release mechanism.

Your speedo is exagerrating by 13% and I consider that a lot, than's for checking that mate, I'll calm down my suspicions of having the wrong gearbox.

My math is spot on. First number (195) is tyre width, while the second is sidewall height given as percentage of the first value. Sidewall height does not translate proportionally to function of circumference, you must add rim diameter to the equation.

TYRE 1:

195/60r14
width: 195 mm
sidewall height = 0,6 × 195=117 mm
rim diameter: 14" = 14 × 2,54 = 355,6 mm
tyre diameter = 355,6 mm + 2 × 117 mm = 589,6 mm
tyre 1 circumference = diameter * pi = 589,6 × 3,14 = 1851,344 mm

TYRE 2

195/75R14
width= 195 mm
sidewall height = 0.75 × 195= 146.25 mm
14" rim diameter = 355,6 mm
tyre diamenter = 355,6 + 2 × 146,25 mm = 648.1 mm
tyre 2 circumference = diameter * pi = 589,6 × 3,14 = 2035.014 mm

2035.014/1851,344 × 100 = 1,099 – the bigger tyre is 10% bigger than the smaller one.
…or
1851,344/2035.014 × 100 = 0,91 – the smaller is 9% smaller than the big one.

Cheers!