I have RR5 with Tannus inserts.  I've had two flats recently (Front and back) and was just using the supplied inner tubes.  I would like some recommendations on replacement inner tubes.  I'm 26X4 tires.

Considering swapping out the Tannus for Mr Tuffy + flat out based on some posts i've read. 

Even if I swap out the tannus, still looking for replacement inner tubes.

OR do I have to match the inner tube size to the type of add'l protection (Tannus vs Mr Tuffy)

Thanks