quick innertube sizing question
 

I have a specialized resolution bike tire
26x2.00
the old tube i pulled out says 26x1.5/2.2 thin, it is a presta valve
is there any other tube sizes I can use besides the 26x1.5/2.2 thin?
also there was a tube in the front tire and no tube in the rear, just a presta valve,
they both have sealant in them as if the person that owned it before me was using it as tubeless and the presta valve is attached to the rim on the back unlike the front which is connected to the tube,
IM SO CONFUSED!!:cry: