Hello,
Not having found a 16 tooth pinion, I set up a 41 tooth rear crown gear to have a 14 * 41 transmission instead of the original 14 * 47 one.
I will have to shorten the chain but the bike is much more pleasant, we turn 1000 rpm less for the same speed, and we do not have to change gears constantly to be in 6th immediately.
For the rare owners of this bike, personally I recommend this modification.