2013 versus 2014 wheel size

[pekingduck]

US Models, maybe other countries:

2013 rear axle is 25mm.

2014 & 2017 are 20mm.

To be sure, what size is yours?

I wonder what the technical reason for lowering the diameter from 2013 to 2014? Was the 2013 "over-engineered"?

I wonder what the technical reason for lowering the diameter from 2013 to 2014? Was the 2013 "over-engineered"?
That's a darn good question for the engineers (or bean counters). I can't imagine any real-world drawbacks - many Hondas use a 25mm axle, like the VTX1300 series. Yet oddly enough, the heavier, more powerful VTX1800 series introduced at the same time, has a 20mm axle.