I have a friend who has machined parts of my racebike. He has made some kits to retrofit the Gen 4 front wheel to the Gen 5 bike. Here is some information from him. I am currently using these on my Gen 5 racebike and they are fantastic.
Below is his info:
In order to use 2011 to 2015 wheels on the 2016 bike, you need to space the rotors out slightly, and also use 2016 wheel spacers. Once you've done this, 2011-2015 wheels are a straight bolt on.
It will likely be much easier to find 2011-2015 wheels than 2016s as spares, so I have built 10 sets of rotor spacers specifically for this.
I have also built captive spacers for the 2016 wheels and 2011-2015 wheels for fitment on the 2016 bike. these captive spacers will NOT work on the 2011-2015 bike.
The rotor spacers can be seen here.
and here are the captive wheel spacers
Prices are as follows
The rotor spacers are 50 USD per pair shipped anywhere in Canada and the USA
To fit your 2011-2015 wheels to the 2016, you ONLY need these rotor spacers and the stock wheel spacers from your 2016 bike. if you don't want to swap spacers between wheels, you can either purchase a set of stock 2016 spacers from the dealer, or purchase a set of captive spacers from me.
The captive wheels spacers are 40 USD per pair shipped anywhere in Canada and the USA
These are captive spacers for the 2016. They can be used in 2011-2015 wheels when fitting the wheels to a 2016 bike.
The rotor spacers and captive spacers combined in a kit are 80 USD shipped anywhere in Canada and the USA
If you are interested in either rotor spacers, captive spacers, or both, please send an email to firstname.lastname@example.org
to arrange for the purchase.