I have a 15 cvo rg ultra fltruse with a sucky 16/17 stock setup. Would like a 21 possibly 23 in a Harley slicer....Harley offers nothing bigger than a 17 for this wheel.

 

They do have a 19" Agitator that is also a 7-spoke and looks very similar/complimentary to your existing rear 16

 

Yes sir your correct and metal artopia sells the closets match agitator on the market all the way to a 30 but no luck on the slicer... The agitator is close, and the route I'll most likely have to go just trying to do an exhaustive search. Thank you

 

I suspect there is a simple reason the MoCo don't offer a 21" wheel for touring bikes. All the various sizes of front wheel to date, 16", 17", 18" and 19", have a near identical rolling diameter, thanks to using lower profile tyres. That keeps the steering geometry for all of them the same. Going to a 21" wheel increases rolling diameter by around 2", hence will require revised geometry. I suspect they have decided that the time is not right for a change like that!

 

Looks like renegade came out with a wheel that's pretty damn close. Called Racine.