Hey Triumphcycleman, your Ryker looks pretty much the same as my RT does for most of our winter!! Yours too, Poli!
Chris, many Adventure bikes &/or bikes designed & intended for use on muddy surfaces get those smaller fenders mainly because a close fitting full fender is far more prone to filling up with mud very quickly and while that can sap a lot of power & be bloody hard to clean out (often requiring the wheel removal!) it can also sometimes even jam the wheel up so much that it stops the wheel from turning!! And when it's the driven wheel, that's really not a good thing for any type of driveline!! Do you really need to ask me how I know this?!
So personally, I reckon the small rear fender is the far better choice to stick with on a Ryker Rally, especially if you ever intend on ryding your Rally on surfaces that are a bit muddy!
But if you're going to spend the bulk of your time on sealed surfaces....
Still, your machine, your choice.