Originally Posted by BMW_Belgier
This belongs in the "cheap" thread...
You, sir, are plain stupid endangering other people with that decision...
How is he stupid? I hate it when people who don't know shit about anything comment and try to talk other people down.
A non rft/ rft mixture is safer than having bald tires.
The sidewall stiffness of an aux rft system is comparable to that of a regular tire. Self supporting tires such as bmw's system have the equivalent stiffness of a regular tire but just with some support patches built into the tires sidewall OUTSIDE of the inner wire and the beading is a bit more tough/stronger to hold the flat tire against the rim.
I'd say, go with a tire that is non rft with a stiffer sidewall than say a 'nexen' tire. i.e. nitto neo gens, etc. then when the fronts wear out replace those. Get a spare and toss it in your trunk.
I'm going with the above solution when my rft's are gone.