It worked ok for me with my old 26er MTB but turned out to be unnecessary. I had a set with smooth tires for warmer dryer weather and a second set with small knob tires for winter.
Turns out I like having the Race King with small knobs in front all the time and I made it through winter trail mud with the Speed King in back. So the bike is plenty fast on smooth stuff and plenty stable on muddy trails with no need to swap tires.
I still have an extra rear wheel but I gave the spare front wheel to my son when he smashed up his front wheel when he first started riding again.
Otto