Yes, my apologies, you are correct I put down the down the wrong size should have been 16/45, going up three at the rear is equivalent to dropping one at the front.
I was replying to a trail bike forum query in relation to the Serow at the same time.
Note to self answer one query at the time I will change the original to read correctly.
It is motorcycling which keeps our heads clear, but difficult to explain to those who have never ridden a bike.
Post how you get on with the 17 tooth, as it may help others
Did you fit the Kliktronic kit yourself?