Originally Posted by
Iride01
If your front tire is still good, then put it on the rear wheel and put the new tire on the front wheel. I myself don't care if the tires are identical make and model. I frequently have run mixes on my bikes during all my 50 plus years of cycling. The fact that now my tires are all the same front and back is just coincidence of circumstances. A couple years ago I had a Vittoria and a Continental on my bike as that is when I last began swapping from one model tire no longer made to another.
+1 with everything
Iride01 said. The Conti 5000 tubed tires are one of the best and better in every way than the 4000's IMO. The worries of mixing models/brands of tires is highly overblown if they are designed for the same purpose. As mentioned put the old 4000 on the rear and good for you for not wanting to create more waste.